Coated article with low-e coating having low visible transmission.

(54) Title: ARTICLE COATED WITH LOW-E COATING THAT HAS VISIBLE LOW TRANSMISSION.

(54) Title: COATED ARTICLE WITH LOW-E COATING HAVING LOW VISIBLE TRANSMISION.

(57) Summary

This invention relates to a coated article that includes a low emissivity (low-E) coating. In certain exemplary embodiments, the low-E coating is provided on a substrate (eg, glass substrate) and includes at least a first infrared (IR) reflective layer and a second IR reflective layer (eg, silver-based layers) that are separated by contact layers (eg, NiCr-based layers) and a dielectric layer of or that includes a material such as silicon nitride. In certain exemplary embodiments, the coated article has a low visible transmission (eg, not more than 60%, more preferably not more than about 55%, and much more preferably not more than about 50%). The most representative figure of the invention is number 1.

(57) Abstract

This invention relates to a coated article including a low-emissivity (low-E) coating. In certain example embodiments, the low-E coating is provided on a substrate (eg, glass substrate) and includes at least first and second infrared (IR) reflecting layers (eg, silver based layers) that are spaced apart by contact layers (eg , NiCr based layers) and a dielectric layer of or including a material such as silicone nitride. In certain example embodiments, the coated article has a low visible transmission (eg, no greater than 60%, more preferably no greater than about 55%, and most preferably no greater than about 50%).

ITEM COATED WITH LOW-E COATING THAT HAS LOW VISIBLE TRANSMISSION

FIELD OF THE INVENTION

This invention relates to a coated article that includes a low emissivity (low-E) coating. In certain exemplary embodiments, the low-E coating is provided on a substrate (eg, a glass substrate) and includes at least a first reflective layer of infrared radiation (IR) and a second reflective layer of IR (eg. , silver-based layers) that are separated by contact layers (eg, NiCr-based layers) and a dielectric layer of or that includes a material such as silicon nitride. In certain exemplary embodiments, the coated article (monolithic and / or IG window unit form) has low visible transmission (eg, not greater than 60%, more preferably not greater than about 55%, and much more preferably not greater than about 50%). In certain exemplary embodiments, the coated article may be heat treated (for example, it may be heat tempered and / or heat folded) and is designed to be essentially thermally stable in heat treatment (HT). English) since its value ΔΕ * (glass-side reflective) due to HT is not greater than 5.0 and more preferably is not greater than 4.5. Articles coated in accordance with certain exemplary embodiments of this invention can be used in the context of insulating glass window (IG) units, vehicle windows, other types of windows, or in any other suitable application.

BACKGROUND OF THE INVENTION

Coated articles are known in the field for use in window applications such as insulating glass (IG) window units, vehicle windows, and / or the like. It is known that in certain cases it is desirable to heat treat (eg, heat temper, heat bend, and / or heat cure) these coated articles for quenching, bending, or the like. Heat (HT) treatment of coated articles typically requires the use of temperature (s) of at least 580 ° C, more preferably of at least about 600 ° C and even more preferably of at least 620 ° C. These high temperatures (for example, for 5-10 minutes or more) frequently cause coatings to be damaged and / or deteriorate or change in an unpredictable way. Thus, it is desirable that the coatings be able to withstand heat treatments (eg, thermal tempering), if desired, in a predictable manner so as not to significantly damage the coating. ,

In certain situations, designers of coated articles strive to achieve a combination of desirable visible transmission, desirable color, low emissivity (or emittance), and low sheet resistance (R_s) - Low emissivity (low-E) and low sheet resistance characteristics allow these coated articles to block significant amounts of IR radiation in order to reduce eg undesirable heating of vehicle or building interiors.

United States Patent No. 7,521,096, incorporated herein by reference, discloses a low-E coating which uses zinc oxide (ZnO) contact layers underneath IR reflective layers based on silver, and above the bottom silver (Ag) based IR reflective layer uses a NiCrO contact layer_x followed by a dielectric tin oxide layer (SnO₂) central. While the ZnO contact layers underneath the silver IR reflective layers provide good structural properties for silver growth, ZnO has been found to degrade the chemical, environmental and mechanical durability of the coating in certain cases. On the other hand, it has been discovered that the thick dielectric layer of SnC> 2 shows a micro-crystallization and tension with HT which causes rough interfacial zones between SnC> 2, ZnO and Ag, 5 which can lead to degradation of durability and may affect transmitted color.

United States Patent No. 5,557,462 discloses a low-E coating with a stack of SiN / NiCr / Ag / NiCr / SiN / NiCr / Ag / NiCr / SiN layers. However, the coated article of the '462 patent is designed for a high visible transmission of at least 63%. The '462 patent at column 3, lines 12-15, teaches that a visible transmission of less than 70% (monolithic coated article) and less than 63% (IG window unit) is not desirable. In this way, the teachings of the '462 patent depart directly from coated articles with less than 63% visible transmission. On the other hand, as explained to a great extent in US Patent No. 8,173,263, the coated articles of the '462 20 patent are not heat treatable because with heat treatment the laminar strength (R_s) rises such as from about 3-5 to much more than 10, the opacity tends to appear, and the reflective ΔΕ * value on the glass side is undesirable because it is greater than 5.0.

Accordingly, it would be desirable to provide a coated article that is characterized by one or more of: (i) low visible transmission, (ii) good durability, and (iii) thermal stability in HT in order to develop a reflective ΔΕ * value glass side not more than about 5.0, more preferably not more than about 4.5.

The term ΔΕ * (and ΔΕ) is well understood in the field and is reported, along with various techniques to determine it, in ASTM 2244-93 as well as reported in Hunter et al., The Measurement of Appearance, 2^to Ed. Chapter 9, page 162 et seq. [John Wiley & Sons, 1987]. As used in the field, ΔΕ * (and ΔΕ) is a way to adequately express the change (or lack thereof) in reflectance and / or transmittance (and thus color appearance, too) in an article after from or due to heat treatment. ΔΕ can be calculated using the ab technique, or using the Hunter technique (designed using a subscript Η). ΔΕ corresponds to the Hunter Lab L, a, b (or Lh, ah, bh) scale. Similarly, ΔΕ * corresponds to the CIE LAB L * Scale, a *, b *. Both are considered useful and equivalent for the purposes of this invention. For example, as reported in Hunter et al. Referred to above, the rectangular / scale coordinate technique (CIE LAB 1976) known as the L *, a *, b * scale can be used, where: L * is units of brightness (CIE 1976); a * is units of red-green (CIE 1976); b * is yellow-blue units (CIE 1976); and the distance ΔΕ * between L * oa * ob * o and L * ia * ib * i is: ΔΕ * = [(AL *)² + (Aa *)² + (Ab *)²]^1/2, where: AL * = L * i - L *_or; Aa * = a * i - a * o; Ab * = b * i - b * o; where subscript 0 represents the coating (coated article) before heat treatment and subscript 1 represents the coating (coated article) after heat treatment; and the numbers used (for example, a *, b *, L *) are those calculated by the coordinate technique L *, a *, b * (CIE LAB 1976) mentioned above. When, for example, the glass-side reflective ΔΕ * values ​​are measured, then the glass-side reflective a *, b * and L * values ​​are used. In a similar way, ΔΕ can be calculated using the equation above for ΔΕ *, that is, ΔΕ * = [(AL *)² + (Aa *)² + (Ab *)²]¹/², by replacing a *, b *, L * with Hunter Lab values ​​ah, bh, Lh. Also within the scope of this invention and the quantification of ΔΕ * are equivalent numbers if they are converted to those other employing techniques calculated by any one of the same concept of ΔΕ * as defined above.

SUMMARY OF THE INVENTION

This invention relates to a coated article that includes a low emissivity (low-E) coating. In certain exemplary embodiments, the low-E coating is provided on a substrate (eg, a glass substrate) and includes at least a first reflective layer of infrared radiation (IR) and a second reflective layer of IR (eg. , silver-based layers) that are separated by contact layers (eg, NiCr-based layers) and a dielectric layer of or that includes a material such as silicon nitride. In certain exemplary embodiments, the coated article has a low visible transmission (eg, not more than 60%, more preferably not more than about 55%, more preferably not more than about 50%). In certain exemplary embodiments, the coated article may be heat treated (eg, heat tempered and / or heat folded) and is designed to be essentially thermally stable in heat treatment (HT) since its value ΔΕ * (glass-side reflective) due to HT is not greater than · 5.0, more preferably is not greater than 4.5. This low ΔΕ * value indicates that the coated article has approximately the same transmission and color characteristics observed with the naked eye both before and after heat treatment (eg, thermal tempering). Articles coated in accordance with certain exemplary embodiments of this invention can be used in the context of insulating glass (IG) window units, vehicle windows, other types of windows, or in any other suitable application.

Moreover, in certain exemplary embodiments of this invention, the coating includes a layer (eg, an outer coating) of or including zirconium oxide and / or zirconium oxynitride. In certain exemplary embodiments, this zirconium oxide and / or zirconium oxynitride layer is substantially thinner than each of the silver reflecting IR coatings in the coating.

It is desirable to provide a coated article that is characterized by one, two, or all three qualities consisting of: (i) low visible transmission, (ii) good durability, and (iii) thermal stability in HT in order to develop a ΔΕ value * glass side reflective not greater than 5.0, more preferably not greater than 4.5.

In certain exemplary embodiments of this invention, a coated article is provided that includes a coating supported by a glass substrate, the coating comprising: a first reflective layer of infrared radiation (IR) and a second reflective layer of IR comprising silver, the first IR reflective layer is located closer to the glass substrate than the second IR reflective layer; a first contact layer comprising NiCr located on top of and directly contacting the first reflective IR layer comprising silver; a dielectric layer comprising silicon nitride located on top of and directly contacting the first contact layer comprising NiCr; a second contact layer comprising NiCr located on top of and directly contacting the layer comprising silicon nitride; the second reflective IR layer comprising silver located on top of and directly contacting the second contact layer comprising NiCr; a third contact layer comprising NiCr located on top of and directly contacting the second IR reflective layer; another dielectric layer comprising silicon nitride located on top of and directly contacting the third contact layer comprising NiCr; a layer comprising zirconium oxide located on top of and directly contacting the other dielectric layer comprising silicon nitride; wherein the second silver comprising IR reflective layer is thicker than the first silver comprising IR reflective layer; wherein each of the first IR reflective layer and the second silver reflecting IR reflective layer are at least twice as thick as the zirconium oxide comprising layer; and where the coated article has a visible transmission, measured monolithically, not more than 60%.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGURE 1 is a cross-sectional view of a coated article according to an exemplary embodiment of this invention.

FIGURE 2 is a cross-sectional view showing the coated article of Figure 1 provided in an IG window unit in accordance with an exemplary embodiment of this invention.

DETAILED DESCRIPTION OF EXEMPLARY MODALITIES OF THE INVENTION

The coated articles described in this document can be used in applications such as IG window units, laminated window units (for example, for use in vehicle or building applications), vehicle windows, monolithic architectural windows, residential windows and / or any other suitable application including single or multiple glass substrates.

In certain exemplary embodiments of this invention, the coating includes a double silver battery. Referring to Figure 1 for example, in certain exemplary embodiments of this invention, a coated article is provided that includes a coating supported by a glass substrate, the coating comprising: a first reflective layer of infrared radiation (IR) 9 and a second reflective layer of IR 19 comprising or consisting essentially of silver, the first reflective layer of IR 9 is located closer to the glass substrate 1 than the second reflective layer of IR 19; a first contact layer comprising NiCr 7 located below and directly contacting the first silver reflecting IR layer 9; a second contact layer 11 located on top of and directly contacting the first reflective IR layer comprising silver 9; a dielectric layer comprising silicon nitride 14 located on top of and directly contacting the first contact layer comprising NiCr 11; a third contact layer comprising NiCr 17 located on top of and directly contacting the layer comprising silicon nitride 14; the second reflective IR layer comprising silver 19 located on top of and directly contacting the second contact layer comprising NiCr 17; a fourth contact layer comprising NiCr 21 located on top of and directly contacting the second IR reflective layer 19, and wherein the second silver reflecting IR reflective layer 19 is at least as thick as the first reflective layer of IR comprising silver 9. In certain preferred embodiments, it has been found that surprisingly beneficial results can be achieved when the second silver-comprising IR reflective layer 19 is thicker than the first silver-comprising IR reflective layer 9, more preferably when the second reflective layer of IR 19 is at least 10 angstroms (Á) thicker (more preferably 10 at least 20 angstroms thicker) than the first reflective layer of IR comprising silver 9. The coating includes three dielectric layers 3, 14, and 24 of or including silicon nitride, as shown in Figure 1. Furthermore, the coating includes a layer 15 (eg, an outer coating) 27 of or including zirconium oxide and / or zirconium oxynitride. In certain exemplary embodiments, this layer of or including zirconium oxide and / or zirconium oxynitride 27 is thinner than one or both of the reflective IR layers 9, 20, 19 comprising silver in the coating. In certain exemplary embodiments of this invention, each of the IR reflective layers comprising silver 9 and 19 is at least twice as thick and more preferably at least three times as thick, as layer 27 or which includes 25 oxide zirconium and / or zirconium oxynitride. In certain exemplary embodiments of this invention, the coating includes only two IR reflective layers 9, 19 of which include silver or the like.

In order to increase durability, along with optical and thermal properties, and to avoid significant structural changes before and after HT, articles coated in accordance with certain exemplary embodiments of this invention have a central dielectric layer 14 of or including silicon nitride and the lower contact layers 7, 17 are based on NiCr (as opposed to ZnO). The use of metallic or substantially metallic (perhaps partially nitrided) NiCr for layer (s) 7, 11, 17 and / or 21 has also been found to improve chemical, mechanical and environmental durability (compared to use ZnO lower contact layers below silver and / or highly oxidized NiCr upper contact layers above silver). Ion spray deposition of the silicon nitride inclusive layer 14 in an amorphous state, such that it is amorphous in both the coated and HT states, has also been found to assist with the overall stability of the coating. For example, 5% HC1 at 65 ° C for one hour will remove the coating from US Patent No. 7,521,096, while the coating shown in Figure 1 and the examples described in this document will pass this HC1 test. And in an environment of

<td>high temperature</td><td>and</td><td>high 1</td><td colspan="2">lumedad, there is less</td><td>hurt</td><td>to the</td>

<td>coating of</td><td>the</td><td>Figure</td><td>1 and</td><td>the examples</td><td colspan="2">in this</td>

<td>document after</td><td colspan="2">of ten</td><td>days</td><td>of exposition,</td><td>than</td><td>the</td>

<td>coating of</td><td>the</td><td>patent</td><td> '096</td><td>after two</td><td>days</td><td>of</td>

exposition.

And with respect to highly corrosive chemicals bricks such as those used to wash away corrosion resistance is such that edge removal is not required in certain exemplary GI and laminate modalities. Similarly, for mechanical abrasion tests, thermal cycling, and salt spray tests, the coatings in the examples described herein were found to be better than that of the '096 patent. On the other hand, it has been found that making the top Ag based IR reflective layer 19 thicker than the bottom Ag based IR reflective layer 9 improves certain optical characteristics of the coating. The coating can be used as coated, or can be heat treated, due to the relatively low ΔΕ * values ​​outlined in this document. For example, when coating 30 is localized surface # 2 of an IG window unit (as shown in Figure 2), the low glass-side reading values ​​ΔΕ * ref due to heat treatment indicate that the article Coated has approximately the same transmission and color characteristics observed with the naked eye both before and after heat treatment (for example, thermal tempering) and thus can be used either as coated or heat treated without significantly affecting its optical characteristics.

In certain exemplary embodiments of this invention such as Figure 1, heat treated or non-heat treated coated articles having multiple IR reflective layers (eg, two separate silver-based layers) are capable of developing laminar strength ( R_s) less than or equal to 5.0 (more preferably less than or equal to 4.0, even more preferably less than or equal to 3.0). The terms heat treating and heat treating used herein mean heating the article to a temperature sufficient to achieve thermal tempering, heat bending and / or heat hardening of the glass inclusive article. This definition includes, for example, heating a coated article in an oven or incinerator to a temperature of at least about 580 ° C, more preferably at least about 600 ° C, for a period sufficient to allow tempering, bending and / or heat setting. In certain cases, the HT can be for at least about 4 to 5 minutes. The coated article may or may not be heat treated in different embodiments of this invention.

FIG. 1 is a side cross-sectional view of a coated article according to an exemplary, non-limiting embodiment of this invention. The coated article includes substrate 1 (eg, a clear, green, bronze, or teal colored glass substrate approximately 1.0 to 10.0 mm thick, more preferably approximately 1.0 mm to 3.5 mm thick) and a coating of low-E (or layer system) 30 provided on the substrate 1 either directly or indirectly. The coating (or the layer system) 30 includes, for example: the bottom dielectric silicon nitride layer 3 which may be S13N4 or Si-rich type silicon nitride for opacity reduction, or any other suitable stoichiometric silicon nitride in different embodiments of this invention, the bottom contact layer 7 (which contacts the bottom IR reflective layer 9), the first conductive and preferably metallic or substantially metallic infrared (IR) reflective layer 9, the upper contact layer 11 (which makes contact with layer 9), the dielectric silicon nitride based and / or inclusive layer 14, the lower contact layer 17 (which makes contact with the IR reflective layer 19 ), the second conductive and preferably metallic or substantially metallic IR reflective layer 19, the upper contact layer 21 (which contacts layer 19), the dielectric silicon nitride layer 24 which may be S13N4, of the Si-rich type for reducing opacity or any other suitable stoichiometric silicon nitride in different embodiments of this invention, and the outer coating layer 27 of or includes a material such as zirconium oxide (eg ZrO₂) and / or zirconium oxynitride. Contact layers 7, 11, 17, and 21 each contact an IR reflective layer (eg, an Ag-based layer). The layers 3-27 mentioned above constitute the low-E (i.e. low emissivity) coating 30 that is provided on the glass or plastic substrate 1. Layers 3--27 can be spray-deposited onto substrate 1 in certain exemplary embodiments of this invention, where each layer is spray-deposited in vacuo using one or more targets as required (the targets of the ion spray They can be ceramic or metallic). Metallic or substantially metallic layers (eg layers 7, 9, 11, 17, 19, and 21) can be ion sprayed in an atmosphere containing argon gas, while nitrided layers (eg layers 3, 7 , 11, 14, 17, 21 and 24) can be ion sprayed in an atmosphere containing a mixture of nitrogen and argon gases. Contact layers 7, 11, 17 and 21 may or may not be nitrided in different exemplary embodiments of this invention

In monolithic cases, the coated article includes only a glass substrate 1 as illustrated in Figure 1. However, the monolithic coated articles described in this document can be used in devices such as laminated vehicle windshields, window units of IG and the like. As far as IG window units are concerned, an IG window unit can include two separate glass substrates. An exemplary IG window unit is illustrated and described, for example, in US Patent Document No. 2004/0005467, the disclosure of which is hereby incorporated herein by reference. Figure 2 shows an exemplary GI window unit including the coated glass substrate 1 shown in Figure 1 which is coupled to another glass substrate 2 through spacer (s), sealant (s) 40 or the like, in where an opening 50 is defined therebetween. This opening 50 between the substrates in the IG window unit embodiments may in certain cases be filled with a gas such as argon (Ar). An exemplary GI unit may comprise a pair of separate clear glass substrates each approximately 3-4 mm thick, one of which is coated with a coating 30 described herein in certain exemplary cases.

where the opening 50 between the substrates can be from about 5 to 30mm, more preferably from about 10 to 20mm and much more preferably from about 16mm. In certain exemplary cases, the low-E coating 30 can be provided on the interior surface of any substrate that is oriented toward the opening (the coating is shown on the interior major surface of the substrate 1 shown in Figure 2 that is oriented opening 50, but instead could be on the main interior surface of substrate 2 which is oriented towards opening 50). Either Substrate 1 or Substrate 2 may be the outermost substrate of the IG window unit on the exterior of the building (for example, in Figure 2 Substrate 1 is the substrate closest to the exterior of the building and the overlay 30 is provided on surface # 2 of the IG window unit).

In certain exemplary embodiments of this invention, one, two, three, or all four contact layers 7,

11, 17, 21 can be of or can include NiCr (any suitable Ni: Cr ratio) and can be nitrided or not (NiCrNx). In certain exemplary embodiments, one, two, three, or all four inclusive NiCr layers 7, 11, 17, 21 are not substantially or completely oxidized. In certain exemplary embodiments, all layers 7, 11, 17 and 21 may be metallic NiCr or substantially metallic NiCr (although trace amounts of other elements may be present). In certain exemplary embodiments, one, two, three, or all four NiCr-based layers 7, 11, 17, 21 may comprise 0-10% oxygen, more preferably 0-5% oxygen, and much more preferably 0- 2% oxygen (atomic%). In certain exemplary embodiments, one, two, three, or all four layers 7, 11, 17, 21 may contain 0-20% nitrogen, more preferably 115% nitrogen, and most preferably approximately 1-12% nitrogen (atomic%). The NiCr 7, 11, 17 and / or 21 based layers may or may not be doped with other material (s) such as stainless steel, Mo or the like. Use of NiCr 7 and / or 17 based contact layer (s) has been found to be below the silver based IR reflective layer (s) 9, 19 improves the durability of the coated article (compared to if layers 7 and 17 were in place of ZnO).

Dielectric layers 3, 14, and 24 can be of or can include silicon nitride in certain embodiments of this invention. Silicon nitride layers 3, 14 and 24 can improve, among other things, the heat treatment ability of the coated articles and can protect the other layers during optional HT, for example, such as thermal tempering or the like. One or more of the silicon nitride layers 3, 14, 24 can be del. stoichiometric type (i.e.₃N₄), or alternatively of the Si-rich type of silicon nitride in different embodiments of this invention. The presence of free Si in the inclusive layer of Si-rich silicon nitride 3 and / or 14 may, for example, allow certain atoms such as sodium (Na) which migrate out of glass 1 during HT to be further stopped efficiently by the inclusive layer (s) of Si-rich silicon nitride before they can reach silver and

<td>damage the</td><td colspan="2">same. In this way,</td><td colspan="3">it is believed that the Si_xN_and rich in</td>

<td>If you can</td><td>reduce</td><td>the amount</td><td>of</td><td>hurt</td><td>made to the (s)</td>

<td>layer (s)</td><td>silver</td><td>during the</td><td>HT</td><td>in</td><td>certain modalities</td>

exemplary of this invention thereby allowing laminar resistance (R_s) decrease or remain approximately the same in a satisfactory manner. Furthermore, it is believed that the Si_xN_and rich in Si in layers 3, 14 and / or 24 can reduce the amount of damage (eg, oxidation) done to silver and / or NiCr during HT in certain exemplary optional embodiments of this invention. In certain exemplary embodiments, when Si rich silicon nitride is used, the Si rich silicon nitride layer (3, 14 and / or 24) as deposited can be characterized by Si layer (s)_xN_and, where x / y can be from 0.76 to 1.5, more preferably from 0.8 to 1.4, even more preferably from 0.82 to 1.2. Any and / or all of the silicon nitride layers set forth herein can be doped with other materials such as stainless steel or aluminum in certain exemplary embodiments of this invention. For example, any and / or all of the 3, 14, 24 silicon nitride layers discussed herein may optionally include from about 0-15% aluminum, more preferably from about 1 to 10% aluminum, in certain embodiments. exemplary of this invention. The silicon nitride of layers 3, 14, 24 can be deposited by ion spraying a Si or SiAl target, in an atmosphere having gaseous argon and nitrogen, in certain embodiments of this invention.

Small amounts of oxygen can also be provided in certain cases in the silicon nitride layers.

Reflective infrared (IR) radiation layers 9 and 19 are preferably substantially or completely metallic and / or conductive, and may comprise or consist essentially of silver (Ag), gold or any other suitable IR reflective material. Reflective IR layers 9 and 19 help to allow the coating to have low-E and / or good solar control characteristics.

Another layer (s) below or above the illustrated coating may also be provided. In this way, while the layer or coating system is on or is supported by the substrate 1 (directly or indirectly), another layer (s) can be provided between it. In this way, for example, the coating of Figure 1 can be considered over and supported by substrate 1 even if another layer (s) is (are) provided between layer 3 and substrate 1. On the other hand, certain layers of the illustrated coating can be removed in certain modalities, while others can be added between the various layers or the various layers can be divided with another layer (s) added (s) between the divided sections in other embodiments of this invention without departing from the whole spirit of certain embodiments of this invention.

While various thicknesses and materials can be used in layers in different embodiments of this invention, the exemplary thicknesses and materials for the respective layers on the glass substrate 1 in the embodiment of Figure 1 are as follows, from the substrate of glass out (physical thickness is exposed):

Exemplary Materials / Thicknesses; Mode of Fig. 1

<td>Cap</td><td>Preferred Interval (A)</td><td>Most Preferred (A)</td><td>Example (A)</td>

<td>Glass (1-10mm thick)</td><td></td><td></td><td></td>

<td>SixNy (layer 3)</td><td>100-500 A</td><td>250-450 A</td><td>320 A</td>

<td>NiCr or NiCrN (layer 7)</td><td>10-30 A</td><td>11-20 A</td><td>12 A</td>

<td>10 Ag (layer 9)</td><td>100-170 A</td><td>110-145 A</td><td>127 A</td>

<td>NiCr or NiCrN (layer 11)</td><td>10-30 A</td><td>11-20 A</td><td>10 A</td>

<td>SixNy (layer 14)</td><td>300-1400 A</td><td>700-1100 A</td><td>865 A</td>

<td>NiCr or NiCrN (layer 17)</td><td>10-30 A</td><td>11-20 A</td><td>11 A</td>

<td>Ag (layer 19)</td><td>140-225 A</td><td>150-215 A</td><td>164 A</td>

<td>15 NiCr or NiCrN (layer 21)</td><td>8-30 A</td><td>10-20 A</td><td>10 A</td>

<td>YES3N4 (layer 24)</td><td>120-360 A</td><td>250-340 A</td><td>304 A</td>

<td>ZrÜ2 (layer 27)</td><td>25-80 A</td><td>25-50 A</td><td>35 A</td>

The second IR reflective layer comprising

0 silver 19 is at least as thick as the first IR reflective layer comprising silver 9. In certain preferred embodiments, surprisingly beneficial results have been found to be obtained when the second silver-containing IR reflective layer 19 is thicker than the first silver-comprising IR reflective layer 9, more preferably when the second IR reflective layer 19 is at least 10 angstroms (Á) thicker (more preferably at least 20 angstroms thicker) than the first IR reflective layer 5 comprising silver 9.

In certain exemplary embodiments, the zirconium oxide and / or zirconium oxynitride layer 27 is thinner than each of the IR reflective layers 9, 19 comprising silver in coating 30. In certain exemplary embodiments of this invention, each of the IR reflective layers comprising silver 9 and 19 is at least twice as thick, and more preferably at least three times as thick, as layer 27 or which includes oxide zirconium and / or zirconium oxynitride.

In certain exemplary embodiments, the silicon nitride based core layer 14 is thicker than each of the other silicon nitride based layers 3 and 24, preferably at least 100 angstroms, more preferably at least 300 angstroms, and much more. more preferably by 400 angstroms. On the other hand, in certain exemplary embodiments, each of the silicon nitride-based layers 3, 14 and 24 is at least twice as thick as the zirconium oxide inclusive layer 27, more preferably at least three times as thick and much more preferably at least four to five times as thick.

Coating 30 offers good durability and allows for lower internal and external reflection compared to a single silver-based low-E coating. However, delta-E * values ​​are typically in the 4-5 range. The coating, and the coated items that the coating includes, can be designed to appear light blue in transmission and reflection, but can become slightly more neutral after the optional HT.

In certain exemplary embodiments of this invention, the coated articles described herein may have the following optical and solar characteristics set forth in Table 2 when measured monolithically (before and / or after the optional HT). Lamellar resistors (R_s) described in this document can take into account all IR reflective layers (eg silver layers 9, 19). It should be noted that before heat treatment means how it was tempered, but before high temperature heat treatment such as thermal tempering as described in this document.

Optical / Solar Features; (Monolithic - Before Heat Treatment)

<td>Characteristic</td><td>general</td><td>Most Preferred</td><td>Much More Preferred</td>

<td>Rs (ohms / square):</td><td> &lt;= 5.0</td><td> &lt;=4.0</td><td> &lt;= 3.0</td>

<td>In:</td><td> &lt;= 0.08</td><td> &lt;= 0.05</td><td> &lt;= 0.04</td>

<td>Tvis (III. C 2^or):</td><td> 30-63%</td><td> 45-60%</td><td> 50-59%</td>

Optical / Solar Features; (Monolithic - After Heat Treatment)

<td>Characteristic</td><td>general</td><td>Most Preferred</td><td>Much More Preferred</td>

<td>R_s (ohms / square):</td><td> &lt;= 5.0</td><td> &lt;=4.0</td><td> &lt;= 3.0</td>

<td>AND_n:</td><td> &lt;= 0.08</td><td> &lt;= 0.05</td><td> &lt;= 0.04</td>

<td>Tv¡s (III. C 2^or):</td><td> 30-63%</td><td> 48-61%</td><td> 52-60%</td>

It can be seen from the above that heat treatment (eg, thermal tempering) slightly increases the visible transmission of the coated article.

In certain exemplary laminate embodiments of this invention, the coated articles described herein which have optionally been heat treated to a degree sufficient for tempering, and which have been coupled with another glass substrate to form an IG unit, may have the optical / solar characteristics set forth above in a structure as shown in Figure 2 (for example, where the two glass sheets are each 6mm thick clear glass with a 16mm opening between them filled with 90/10 argon / air). These IG window units can have a visible transmission of approximately 20-55% in certain exemplary embodiments of this invention.

The following examples are provided for example purposes only and are not intended to be limiting unless specifically claimed.

EXAMPLES 1-3

The following Examples 1-3 were made by sputtering coatings on 6mm thick clear / transparent glass substrates in order to have approximately the layer stacks exposed in Figure 1 with the respective layer thicknesses that They are shown in the example column in the diagram above with respect to layer thicknesses.

The optical characteristics of Examples 1-3 measured for a monolithic coated article as shown in Figure 1 are set out below. All values ​​measured in the table immediately below are pre-HT. It should be noted that f refers to the reflection of the film, that is, the reflection of the film side of the coated article, while g refers to the reflection of the glass side.

<td></td><td colspan="3">Monolithic (Pre-HT)</td>

<td>Characteristic</td><td>Example 1</td><td>Example 2</td><td>Example 3</td>

<td>Tvís (or TY) (III. C 2 °):</td><td> 52.3%</td><td> 54%</td><td> 54.5%</td>

<td>a * t (III. C 2^or):</td><td> -2.8</td><td> -4.0</td><td> -3.6</td>

<td>b * (III. C 2^or):</td><td> -5.2</td><td> -4.6</td><td> -6.1</td>

<td>RfY (III. C, 2 degrees):</td><td> 10.3%</td><td> 8.4%</td><td> 7.1%</td>

<td>a * f (III. C, 2^or):</td><td> -10.5</td><td> -5.4</td><td> -5.1</td>

<td>b * r (III. C, 2^or):</td><td> 8.5</td><td> 1.8</td><td> 1.9</td>

<td>R_gAnd (III. C, 2 degrees):</td><td> 9.8</td><td> 8.7%</td><td> 8.0%</td>

<td>to*_g (III. C, 2^or):</td><td> -4.3</td><td> -1.9</td><td> -1.3</td>

<td>b *_g (III. C, 2^or):</td><td> -5.7</td><td> -9.3</td><td> -9.4</td>

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For example, monolithically measured coated articles had a desirable low visible transmission and clearly desirable glass-side reflective color. In particular, the a *_g monolithic (reflective color a * on the glass side) was in a desirable range of about -1 to -5, and the b *_g(glass side reflective b * color) was in a desirable range of about -5 to -10. On the other hand, the glass side reflection (RgY) was good because it was less than 10%, more preferably not more than 9%. These are desirable features, especially when the coated article is to be placed in an IG window unit as shown in Figure

2.

The optical characteristics of Examples 1-3 measured for a monolithic coated article after thermal tempering are set forth below.

Monolithic (Pos-HT)

<td> 10</td><td>Characteristic</td><td>Example 1</td><td>Example 2</td><td>Example 3</td>

<td></td><td>Tvís (or TY) (III. C 2^or):</td><td> 59.8%</td><td> 55.6%</td><td> 54.2%</td>

<td></td><td>a * t (III. C 2^or):</td><td> -3.9</td><td> -5.3</td><td> -4.8</td>

<td></td><td>b * t (III. C 2 °):</td><td> -5.0</td><td> -6.2</td><td> -6.6</td>

<td></td><td>RfY (III. C, 2 degrees):</td><td> 10.4%</td><td> 6.1%</td><td> 6.7%</td>

<td> 15</td><td>a * r (III. C, 2^or):</td><td> -14.8</td><td> -5.3</td><td> -6.4</td>

<td></td><td>b *_F(III.C, 2 °):</td><td> 8.2</td><td> -0.3</td><td> -0.6</td>

<td></td><td>R_gAnd (III. C, 2 degrees):</td><td> 9.7</td><td> 9.0%</td><td> 9.1%</td>

<td></td><td>to*_g (III. C, 2^or):</td><td> -9.6</td><td> -0.9</td><td> -0.9</td>

<td></td><td>b '_g (III. C, 2^or):</td><td> -3.9</td><td> -10.9</td><td> -10.2</td>

<td> 20</td><td></td><td></td><td></td><td></td>

<td></td><td>It can</td><td>observe</td><td>depart</td><td>of the examples</td>

Older than monolithically measured coated articles had a desirable low visible transmission and had a clearly desirable glass-side reflective color. In particular, the a *_g monolithic (glass side reflective color a *) was in a desirable range in Examples 2-3 of about 0 to -2 and b *_g (glass side reflective b * color) was in a desirable range in Examples 2-3 of about -8 to -12. On the other hand, the glass side reflection (RgY) was good because it was less than 10%. These are desirable features, especially when the coated article is to be placed in an IG window unit as shown in Figure 2.

The optical characteristics of IG window units including the coated articles of Examples 1-3 are set forth below specifically when the coated articles are located in IG window units as shown in Figure 2 (on surface # 2 of the IG unit, so that the reflective values ​​on the glass side are indicative of the exterior). These values ​​are for a HT-free coated article used in the IG unit (i.e. not thermally tempered).

IG unit (without HT)

<td>Characteristic</td><td>Example 1</td><td>Example 2</td><td>Example 3</td>

<td>Tvís (or TY) (III. C 2^to):</td><td> 47.1%</td><td> 48.4%</td><td> 48.4%</td>

<td>a * (III. C 2^or):</td><td> -4.1</td><td> -5.1</td><td> -4.6</td>

<td>b * t (III. C 2^or):</td><td> -4.6</td><td> -4.3</td><td> -5.4</td>

<td>RfY (III. C, 2 degrees):</td><td> 16.3%</td><td> 14.8%</td><td> 13.5%</td>

<td>a * f (III. C, 2^or):</td><td> -7.2</td><td> -4.1</td><td> -4.3</td>

<td>b * f (III. C, 2^or):</td><td> 4.3</td><td> 0.7</td><td> 1.5</td>

<td>R_gAnd (III. C, 2 degrees):</td><td> 12.0%</td><td> 11.0%</td><td> 10.0%</td>

<td>to*_g (III. C, 2^or):</td><td> -4.4</td><td> -2.7</td><td> -2.4</td>

<td>b * g (III. C, 2 °):</td><td> -6.3</td><td> -9.3</td><td> -9.2</td>

relationship modality invention know,

While the invention has more than what is practiced and should be, but because it has been described, it is currently considered to be preferred, it should be understood that limited to the modality given in the opposite, it is intended to cover several modifications and included within the equivalent arrangements that are spirit and scope of the appended claims.

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