Sodium-resistant joining glass and the use thereof

Sodium-resistant sealing glass and its application technical field

[0001] The present invention relates to a sodium-resistant sealing glass, which can be used to prepare a combination with ceramics, such as alumina (also known as Al2O3, alumina ceramics or Al2O3 ceramics) and/or with metals and/or both The sealing piece. The invention also relates to the use of the sodium-resistant sealing glass. Sodium-resistant sealing glass is a sealing material that can withstand especially liquid sodium and/or sodium vapor, and is therefore suitable for preparing exposed to, for example, liquid sodium and/or sodium vapor and/or other aggressive sodium compounds and/or containing Sealing element for sodium media.

Background technique

[0002] For example, for the preparation of energy storage and energy generation units in which liquid sodium and/or sodium compounds are used as electrolytes or cooling media, this type of sodium-resistant sealing glass is of interest. Examples of such energy generating units are electrochemical cells, such as batteries and nuclear reactors, preferably the following types of nuclear reactors: fast breeder reactors, fast neutron reactors, sodium-cooled fast reactors, and/or liquid metal fast breeder reactors. These reactors can be used in these reactors. The sealing glass used can be conveniently applied to the following technical components: technical components in and/or connected to these reactors and in contact with the sodium and/or sodium compounds. An example of such a technical component is preferably a feedthrough device, which is used to supply electric power and/or manipulation signals to sensors and/or actuators and/or motors, for example in electric pumps. Another application field of the sodium-resistant sealing glass to which the present invention belongs is equipment for the disposal of toxic materials, in which sodium compounds and/or sodium vapor and/or liquid sodium may be generated during the processing.

[0003] In recent years, especially electrochemical storage and energy generation technologies have gained considerable interest. In this regard, it can be used in the following areas of electric mobility: used as an emergency power system in local power supply, and used to stabilize network systems mainly due to the increased share of renewable energy.

[0004] Various battery technologies are discussed here, and lithium ion batteries (LIB) are among the most discussed. High-temperature sodium batteries (sodium B-batteries, SBB) represent another type of battery. Its advantages over LIB are higher energy density and high energy efficiency. At high temperatures, usually greater than 250°C, SBB uses liquid sodium as the negative electrode. In general, the difference between these two variants is: one is a sodium-sulfur battery (Na/S), which uses sulfur as the positive electrode. The other is a sodium-metal chloride battery, also known as a ZEBRA battery, which uses a metal chloride, such as sickle chloride or ferric chloride as a positive electrode and sodium tetrachloroaluminate (NaAlCh) as a liquid electrolyte. The common feature of both types is that they use a sodium ion conductive membrane composed of B- or Β-Α12θ3 and a housing component composed of a-AhOs, and the latter can be additionally connected with a metal cover if appropriate. As used herein, the term "alumina", or synonymous alumina ceramic or synonymous ΑΙ2Ο3 or similar synonymous ΑΙ203 ceramic, preferably includes the following specific forms: α- and/or β- and/or -alumina . The use of the term "alumina" does not imply any restriction on the purity and thus the content of the Al203 and/or the component under consideration of the Al203 ceramic.

[0005] A component made of ceramic, preferably alumina, or a seal between another metal component represents a key component in an electrochemical cell because it determines the useful life. If a leak occurs in this area, the liquid sodium can come into contact with the air and start to burn. The purpose of the sealing glass as the sealing material here is to achieve continuous hermetic sealing throughout the battery life. This can preferably be achieved by good compliance with the thermal expansion coefficients of all the materials involved, which enables the sealing member to withstand operating conditions, and enables the glass to have very good resistance to all active groups without impairing its function. Points of chemical resistance.

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[0006] There are two basic types of sealing glass used in batteries: silicate-based glass and borate-based glass. The borate-based glass has the following advantages: it generally has very good resistance to molten sodium, but its performance in terms of chemical resistance to metal chlorides is worse. In addition, the frequently used aluminum borates usually only have low stability to crystallization, which limits them from the perspective of process control. A specific form is detailed in, for example, US 8,334,053 B2, which describes insulating glass that relies on corrosion resistance to the anode and cathode of SBB. According to the document, glass with a high silicon content containing more than 40% by weight and less than 25% by weight of B2θ3 is used on the metal salt side, and a glass with less than 20% by weight is used on the sodium side. Inquiry 2 and a very low silicon content borate glass with a sum greater than 35% by weight of B2θ3.

[0007] GB 2207545 A describes the use of borate glass 8245 from Schott AG as a sealing glass for Na/S batteries. The glass has very good chemical stability to the medium of Na/S batteries, but due to its linear thermal expansion coefficient a₂o-3oorM to 5 · 2 X 10-⁶Κ-^χ, So it can only be hermetically sealed with alumina to a limited extent for a long time.

[0008] US 4,268,313 A describes a borosilicate glass for use in Na/S batteries. However, the glass contains alkaline earth metal oxides Ca0, Sr0, and BaO in a total amount of at least 6% by weight. These components are beneficial for glass formation and can improve the flow behavior, but through ion migration with the electrolyte, preferably the electrolyte in the SBB, they can reduce the performance of the active component.

[0009] US 8,034,457 B2 describes a sealing glass containing up to 25% by weight of 82.3 for energy storage devices. The limitation of the upper limit of the content of B2O3 is explained by the fact that otherwise, the sealing glass will suffer excessive erosion by the adsorbed water.

[0010] US 8,043,986 B2 includes a sealing glass for SBB, which contains at least 0.1-10% by weight of Zr02. Zinc oxide is used in this document to improve chemical resistance. However, this also leads to a higher tendency for phase separation and crystallization, and also reduces the productivity of the glass manufacturing process due to high raw material costs.

Summary of the invention

[0011] Contrary to the background art, an object of the present invention is to provide a sealing glass suitable for preparing a metal and/or ceramic sealing member, which has very good resistance to molten metal salt and sodium melting. Resistance to body, liquid sodium and/or sodium vapor and/or aggressive sodium compounds. Preferably, the suitable ceramic to be sealed is alumina and/or sodium superion conductor (NASICON), and preferably, the suitable metal is steel and/or alloy. Another object of the present invention is to use the sealing glass to provide a ceramic, preferably alumina and/or sodium superionic conductor sealing member, and also to provide an electrochemical energy storage and /Or an energy generating unit, and an electrical feedthrough device including the sealing glass as an electrical insulating fixing material, which benefits from the performance of the sealing glass and therefore has improved performance.

[0012] The object is achieved by the sealing glass, the sealing member, the electrochemical energy storage and/or energy generation unit, and the feedthrough device and use according to the claims. Preferred embodiments are obvious from the claims dependent on the independent claims.

[0013] In the following, unless expressly specified otherwise, all data relating to components and/or contents are provided based on the weight% of the oxide.

[0014] The sealing glass according to the present invention contains 40%-50% SiO2 and greater than 25% up to 30% B2O3. This combination affects especially the coefficient of thermal expansion and at the same time controls the flow behavior. According to the present invention, the sealing glass further contains 5%-15% risk 0 and 17%-25% AI2O3. In particular, these components can be used to make the sealing glass have good chemical resistance.

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[0015] The sealing glass according to the present invention contains, optionally a total of less than 2% of the alkaline earth metal oxides Μ0 ° Μ0 represents Ca0, Sr0 and/or BaO, which can exist alone in the sealing glass, or up to the total Any possible combination of the above definitions of content exists. Alkaline earth metal oxides can have a positive effect on the flow behavior of the glass. Since it can reduce the performance of an active component through the diffusion or ion migration of sodium ions with the electrolyte, its content is reduced to the lowest value according to the present invention.

[0016] In addition, the sealing glass according to the present invention does not contain ZrO2, except for the presence of impurities at most. Impurities can be added to the glass through contamination of the raw materials used in glass manufacturing and/or through contamination and/or corrosion of the melting unit used. Impurities of this type generally do not exceed a ratio of 0.2% by weight, preferably 0.1% by weight. This of course also includes the complete absence of ZrO2. Contrary to the teaching in the cited prior art, it has been found that even if Zr02 is used to improve chemical resistance, the sealing glass according to the present invention has very good chemical resistance. Moreover, it has been found that ZrO2 can act as a seed crystal, which promotes crystallization during processing. The crystallization (including partial crystallization) of the sealing glass according to the present invention is undesirable, because the crystalline region causes difficulties in the preparation of the sealing member and/or can even cause leakage of the sealing member. Therefore, the sealing glass according to the present invention is particularly preferably an amorphous glass, especially an amorphous glass without crystalline regions.

[0017] Tests conducted on the sealing glass have shown that, contrary to the cited prior art, if the content of B2O3 is increased to more than 25%, it is impossible to establish hydrolytic aging. In contrast, the inventors found that higher boron content of greater than 25% to 30% even unexpectedly improved resistance to sodium melt. Due to the above composition, the sealing glass according to the present invention can be conveniently melted in a non-crystallization and non-melting manner.

[0018] In a preferred embodiment, the sealing glass according to the present invention contains up to 5% ZnO and/or up to 5% Ti02 and/or up to 5% SnO2 and/or up to 15% MgO. These optional additional components can exist alone in the sealing glass or in any desired combination. These components particularly improve the chemical resistance in the alkaline range. MgO is an optional component and can be included in the sealing glass to adapt the thermal expansion of the sealing glass to the joining partner. Generally, an increase in the content of MgO leads to an increase in the coefficient of thermal expansion. The present invention also foresees that 0Y2% MgO can be advantageously included in the sealing glass.

[0019] It is particularly preferred that the components of the sealing glass are selected within the above-mentioned limits, so that the linear thermal expansion coefficient a of the sealing glass in the temperature range of 20300°C_2O-3oor value is 5.5 X 10^-¾^-1To 10.5 X ΙΟ^Κ'¹, Or more preferably 5.5 X 10^_6K^_1M8.5 X 10^_6K^_1, Very particularly preferred 6.0 X 10^_6K^_1 Up to 8.0 X 10^_6K^_1. In particular, this can realize the adaptation of the sealing glass to the thermal expansion behavior of alumina.

[0020] It is also preferred that the sealing glass additionally contains up to 30% by volume of oxide fillers, especially inorganic oxide fillers. These fillers can be used in particular to set the thermal expansion behavior and/or corrosion resistance and/or flow behavior. The fillers are preferably present in the form of particles and/or fibers. Examples of such fillers are MgO, A12O3 and/or stable Zr02. These can be preferably applied in order to adapt the thermal expansion of the sealing glass and filler mixture to the thermal expansion of the metal counterpart seal. The filler material is usually not part of the glass matrix, but is usually embedded in it as a separate component.

[0021] The present invention also includes a sealing member between the first sealing member and the second sealing member, which uses the above-mentioned sealing glass. The sealing part should be understood as any part connected with the sealing glass. In this case, the sealing glass in particular forms a complete joint with each sealing part. The complete joint is distinguished by the following facts: the mating joint, here each sealing part, and the sealing glass by atomic force or molecular force Keep it together. This leads to an inseparable joint, which can only be separated by breaking the joint method, here the sealing glass. It is particularly advantageous that the sealing glass can be used as

A mating sealing member provides an airtight joint between the sealing parts.

[0022] The sealing member between the sealing parts is prepared by sealing glass, and correspondingly exists in the sealing area of each sealing part joined with the sealing glass. Therefore, the sealing area is an area located on the surface of each sealing member in contact with the sealing glass. The sealing member can be joined to the sealing glass over its entire surface area or in any desired area, and it can be joined to other sealing members through the latter. As mentioned above, the sealing glass according to the present invention is particularly suitable for sealing ceramics and/or metals. Correspondingly, the sealing member according to the present invention provides a first sealing member, which includes a ceramic or metal component at least in the sealing area. The second sealing member also contains ceramic or metal at least in the sealing area. Combinations of metals or ceramics are of course equally feasible and are included in the present invention. In combination, this also means that the second sealing part may be a mixed part composed of metal and ceramic in the area of the sealing part. In other words, and possibly simplified, the sealing glass according to the present invention provides a connection between metal and metal, or ceramic and metal, or ceramic and ceramic, or metal or ceramic and a mixed component containing metal and ceramic.

[0023] As described above, the sealing glass according to the present invention is particularly suitable for sealing aluminum oxide, and thus provides a sealing member according to the present invention, wherein the first sealing member includes at least in the sealing area Alumina, especially composed of alumina. The second sealing member includes one or a combination of metal and aluminum oxide at least in the sealing area. In the combination, a sealing part is obtained in particular in the form of a mixed part composed of metal and alumina in the sealing area.

[0024] If the alumina of the first sealing member contains α- or B- or B"-alumina, especially if it consists of it, it is preferable. It is particularly preferred that the alumina of the second sealing member is also α-alumina or β-alumina or β-alumina, if it is composed of or contains alumina at least in the sealing area. However, this does not mean that the embodiment of the alumina of the first sealing part must be the same as the embodiment of the alumina of the second sealing part; on the contrary, if the alumina of the first and second sealing parts is implemented The examples are different, for example, if the first sealing member contains alpha-alumina and the second sealing member contains beta-alumina or alumina, it may be preferable. This configuration is used in SBB in particular, and it is therefore of interest.

[0025] From the types of NASICON (sodium super ionic conductor) ceramics, typically AxBy (P0"3 type with alkali metal ion A (such as Na) and multivalent metal ion B (such as Fe, Cr, Ti) Among the types, it is also feasible and preferable to choose ceramics instead of alumina. All the above embodiments have these types of ceramics, and it is also feasible.

[0026] Equally feasible are sealing parts in the housing of the sensor and/or actuator, which are exposed to aggressive media, in particular liquid sodium or sodium salt. Possible applications where these can be found are, for example, in the electrolysis of liquid sodium through salt melts, and also in the field of cooling breeder reactors with liquid sodium.

[0027] As described above, the second sealing member also preferably contains metal at least in the sealing area. It is particularly preferable that the linear thermal expansion coefficient a20-30 (rc (in the same temperature range) of the metal) is greater than or equal to the linear thermal expansion coefficient a20-300Co of ceramics, especially alumina

[0028] Particularly preferably, the linear thermal expansion coefficient a of the metal_2OThe value of -3oor is greater than 8Χ10-⁶Κ-^χ_οExamples of such preferred metals are high-grade steel, low-carbon steel, and/or sickle alloy.

[0029] The sealing member according to the present invention makes it possible to prepare electrochemical energy storage and/or energy generation units with increased service life and/or increased efficiency. Therefore, these are also included in the present invention. An example of an electrochemical energy storage device is a battery in a charging mode, and an example of an electrochemical energy generating unit is a battery or a battery in the discharge mode. Reactors for chemical and/or biochemical reactions are equally feasible, in which the energy state in the reactor is represented by the respective oxidation and reduction states of the reactants and products. It is particularly preferred that the energy storage and/or energy generation unit according to the present invention is a sodium-sulfur battery or a sodium-metal chloride battery including the sealing member according to the present invention.

[0030] The sealing member according to the present invention also facilitates the preparation of feedthrough devices, especially electrical feedthrough devices.

[0031] A preferred electrical feedthrough device includes a metal carrier element provided with a feedthrough opening and a metal functional element. The functional element is fixed in the feed-through opening with the sealing glass, and the carrier element is electrically insulated from the functional element. As a result, the feedthrough opening is sealed, in particular hermetically sealed.

[0032] It is very particularly preferred to use the sealing glass according to the present invention to prepare a sodium-sulfur battery or a sodium-metal chloride battery, in particular for hermetically sealing its casing and/or for sealing and/or joining its electrolyte cells. Membrane parts. It can also be joined to a suitable carrier element or the like.

[0033] Most advantageously, the feedthrough device according to the present invention can be applied to devices for the disposal of toxic waste and/or nuclear reactors, in particular fast breeder reactors. Among them, the application as an electrical feedthrough device for the containment of the reactor and/or as an electrical feedthrough device for the cooling circuit mainly benefits from the sealing glass and/or the sealing joint as described herein. The cooling circuit may include primary and/or secondary cooling circuits that use liquid sodium as the cooling medium, especially in fast breeder reactors. The feedthrough device may be exposed to liquid sodium and/or sodium vapor, and must be able to withstand such permanent exposure or exposure due to emergency situations. The feedthrough device may be used to provide, for example, an electric pump and/or sensor with an electric circuit in the cooling circuit, and/or to derive the signal of the sensor applied in or at the cooling circuit. Another preferred application of the feedthrough device is in the containment of a reactor, so as to connect the inside of the containment with the outside without the passage of harmful media. In this application, the feedthrough device can be exposed to liquid sodium and/or sodium vapor, especially in emergency situations, so the most important thing is that the feedthrough device reliably seals the hermetic device.

[0034] Another useful application area of the feedthrough device is equipment for the disposal of toxic waste, for example, where the waste is burned or chemically destroyed so that corrosive sodium compounds and/or liquid sodium and / Or such equipment for sodium vapor.

Description of the drawings

[0035] The present invention will be explained in more detail on the basis of the drawings. All drawings are completely schematic, and the size of the actual object can deviate from the size and/or performance in the drawings, where:

[0036] FIG. 1a: shows a cross-sectional view of the first sealing member with sealing glass in certain areas.

[0037] FIG. 1b: shows a cross-sectional view of another first sealing member with sealing glass in certain areas.

[0038] FIG. 2a: shows a cross-sectional view of a component assembly device including a sealing member.

[0039] FIG. 2b: shows a cross-sectional view of another component assembly including a sealing member.

[0040] FIG. 3: shows a cross-sectional view of the ZEBRA battery.

[0041] FIG. 4: shows a cross-sectional view of another ZEBRA battery.

[0042] FIG. 5a: shows a cross-sectional view of the feedthrough device.

[0043] FIG. 5b: shows a top view of the feedthrough device according to FIG. 5a.

[0044] FIG. 6: shows a cross-sectional view of an alternative feedthrough device.

[0045] FIG. 7: shows a cross-sectional view of the containment vessel of the reactor.

[0046] FIG. 8: shows a cross-sectional view of the containment vessel of the reactor and the reactor itself.

Detailed ways

[0047] FIG. 1a schematically shows a cross-sectional view of the first sealing member. The sealing part (2) represents the so-called substrate for sealing glass (1), the sealing glass (1) is located on the surface of the sealing part (2) in certain areas, and is formed in these areas

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Complete joint with sealing part (2). The area where the sealing glass (1) is present may be a sealing area, and is defined as a sealing area hereinafter, in which a sealing member with other sealing components is prepared. The sealing part (2) shown with the sealing glass (1) can be used to prepare the sealing part, especially by joining with another sealing part. In this example, the sealing member (2) is composed of β-alumina or β-alumina or NASICON. As mentioned above, the aluminum oxide (2) of the sealing component is only present in those sealing areas where the sealing glass (1) is used for bonding, and other areas of the sealing component are composed of different materials, which is also feasible.

[0048] FIG. 1b shows a sealing member with a sealing glass that is basically the same as that of FIG. 1a, except that in this example the sealing member (3) is composed of α-alumina, or at least in the presence of the sealing glass (1 These sealing areas of) include the latter. All further statements related to figure lb can also be applied to figure lb.

[0049] FIG. 2a shows a cross-sectional view of a sealing member formed by a component assembly device, which is joined by a sealing glass (1), and is composed of a first sealing component (2) and a second sealing component (3) . It can be seen that with regard to Figure 2a, the object shown is basically a combination of Figures la and lb. In this figure, the material of the first sealing member (2) is also B-alumina or B-alumina, and the material of the second sealing member (3) is α-alumina. The sealing glass (1) is completely joined to the surface of the sealing parts (2, 3) in the sealing area, and thus an airtight and durable joint can be produced between the sealing parts (2.3).

[0050] FIG. 2b shows a cross-sectional view of an embodiment similar to that of FIG. 2a, except that the first sealing member is composed of β-alumina or -alumina (2) and α-alumina (3). In this exemplary embodiment, the second sealing member (4) is composed of metal. It is obvious to a person skilled in the art that a variety of different entire parts can be prepared through appropriate combinations of the sealing members shown, which can be adapted to the needs related to their use.

[0051] FIG. 3 shows a cross-sectional view of a schematic ZEBRA battery. The battery is sealed by the can-shaped shell and cover . The housing (4) and the cover (3) are joined to each other through the sealing glass (1). The cover (3) represents the so-called first sealing member, and the housing (4) represents the so-called second sealing member of the above-mentioned sealing member. In ZEBRA batteries, the casing (4) is usually composed of metal, such as high-grade steel, sickle alloy or low carbon steel, and the cover (3) is composed of alumina, especially α-alumina. The sealing glass (1) according to the present invention produces a reliable and long-lasting tight joint between the two sealing parts, the cover (3) and the casing (4), so the contents of the ZEBRA battery are safely enclosed in the casing in.

[0052] A hollow cylindrical semipermeable membrane (2), usually made of B-alumina or B-alumina, is located inside the housing. The intermediate space between the inner wall of the shell (4) and the outer wall of the membrane (2) is filled with liquid sodium (11), which forms an anode. By contacting the conductive shell , the latter also acts as an anode. The inner space of the hollow cylindrical membrane (2) is filled with, for example, sodium tetrachloroaluminate as the electrolyte (10) and functions as a cathode. The semi-permeable membrane composed of B-alumina or B"-alumina (2) is only permeable to sodium ions. It is joined with the cover through the sealing glass . The film (2) here represents the so-called first sealing member, and the cover (3) represents the second sealing member in the general principle of the above-mentioned sealing member. In the sealing member in this area of the ZEBRA battery, it is important that the sealing glass is not permeable to the electrolyte (10) and liquid sodium (11), because otherwise the electrolyte (10) and/or liquid sodium (11) It may be contaminated by other substances, and the battery may be destroyed or at least its capacitance may be reduced accordingly.

[0053] In this example, the cover (3) itself is an electrical insulator, so electrodes (52) are needed to make the battery contact the anode and cathode to form a circuit. In the example shown in Fig. 3, the metal rod (52) passes through the cover (3) through the sleeve (51). In this regard, it is also conceivable to guide a metal rod (52) or generally an electrode through the cover (2) in the glass-metal guide containing the sealing glass according to the present invention.

[0054] FIG. 4 shows another embodiment of the ZEBRA battery as shown in FIG. 3. Since the sealing glass produces an electrical insulation seal between the two sealing parts at the junction between the housing and the cover (41), it is made of metal or at least conductive material.

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The material is prepared as the cover (41) shown in Figure 4, and it has a geometrical shape in such a way that it does not contact the electrolyte (10) so that it is possible to omit the guide electrode (52) and then the cover itself serves as a cathode. The effect is also possible. Afterwards, the sealing glass is in a single area, here in the form of a ring, and is joined with three sealing parts in particular, the housing (4), the cover (3) and the film (2).

[0055] FIG. 5a schematically shows a cross-sectional view of the feedthrough device (20). The feedthrough (20) includes a carrier element (30), which in this example is represented by a metal cylinder. The carrier element (30) usually has the function of an external conductor. In the application area, it is usually made of steel. The preferred embodiment is made of carbon steel, austenitic steel and/or ferritic steel. For specific application areas, the carrier element (30) can be made of Kovar alloy or ceramic. The carrier element (30) also includes a feed-through opening that connects one side of the carrier element (30) to the other side. The functional element (31) is arranged inside the feedthrough opening. In this example, the functional element (31) is represented by a rod acting as an electrical conductor, also called an inner conductor. The functional element (31) can be composed of different suitable materials, such as Kovar and/or copper and/or alloys, for example, Sickle alloy and/or Sickle alloy. The sealing glass (1) fixes the functional element (31) in the feedthrough opening in an electrically insulating manner and simultaneously seals the feedthrough opening. According to the sealing glass (1) of the present invention, the feedthrough device (20) has the advantage that the feedthrough opening can be hermetically sealed. For the preparation of the feedthrough device (20), the sealing glass (1) is usually welded with the carrier element (30) and the functional element (31), so that the carrier element (30), the sealing glass (1) and A sealing part connection is established between the functional elements (31).

[0056] FIG. 5b shows a top view of the feedthrough device (20) according to FIG. 5a. It can be seen that the functional element (31) is centered in the feedthrough opening. This geometry is usually used in compression seals where the thermal expansion of the carrier element (30) is greater than the thermal expansion of the sealing glass (1). As an effect, during the period when the sealing glass melts within the feed-through opening, the cooling carrier element (30) then shrinks on the sealing glass, and thus generates compressive stress on the sealing glass (1). The compressive stress enhances the mechanical force required to push the sealing glass out of the feed-through opening, and thereby increases the mechanical stability of the entire feed-through device (20).

[0057] The feedthrough device (20) as shown in FIGS. 5a and 5b represents a typical device of the so-called large feedthrough device category.

[0058] FIG. 6 shows a cross-sectional view of another embodiment of the feedthrough device (20), which has a plurality of contact openings in the carrier element (30). This so-called planar element has a dimension whose width is greater than its height. The feedthrough opening can be provided in the matrix. The substrate itself is variable, which means that the location of the feedthrough opening can be selected according to the desired application. This embodiment can be used, for example, to have a plurality of electrical and/or electronic components with circuits for driving them, for example, and/or to direct signals generated by those components passing through the carrier element (30). The carrier element (30) may or may not seal the housing of the device. The carrier element (30) can be made of metal and/or alloy, or ceramic, especially the aforementioned materials.

[0059] In FIG. 7 is shown a containment (80) of an energy generating device, such as a containment of a reactor, particularly a nuclear reactor, or equipment for disposing of toxic waste. These must be safely enclosed in the containment (80), also in emergency and fault conditions. In order to provide contact with the generator and/or device in the containment, preferably a feedthrough device (20) according to the present disclosure can be used. Such equipment is, for example, a device that monitors the operating conditions of a generator and/or a device that manipulates a reactor or other devices.

[0060] An energy generating device (81) such as a reactor is shown in FIG. 8. This illustrative example also includes the cooling circuit of the reactor, in the case of a fast breeder reactor, in particular its primary and/or secondary cooling circuit operating with liquid sodium as the cooling medium. The feedthrough device (20) can be used to supply manipulators and/or sensors and/or actuation devices and/or motors with current, especially those in electric pumps. In addition, the containment vessel (80) may have a feedthrough device (20) as described in the context of FIG. 7.

[0061] The sealing glass (1) according to the present invention can be prepared by a conventional glass melting method. The details of glass melting

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It is known to those skilled in the art and will not be repeated here.

[0062] The following Table 1 summarizes the components and physical properties of four exemplary sealing glasses (1)1-4 according to the present invention.

[0063]

<td>Components:</td><td>1</td><td>2</td><td>3</td><td>4</td>

<td>Si0₂</td><td>49</td><td>44</td><td>40</td><td>42</td>

<td>B2O3</td><td>26</td><td>26</td><td>30</td><td>26</td>

<td>Na20</td><td>8</td><td>10</td><td>6</td><td>15</td>

<td>AI2O3</td><td>17</td><td>20</td><td>24</td><td>17</td>

<td>performance:</td><td></td><td></td><td></td><td></td>

<td>Tg"C]</td><td>546</td><td>488</td><td>548</td><td>533</td>

<td>Density [g/cm3]</td><td>2.35</td><td>2.26</td><td>2.43</td><td>2.40</td>

<td>a20-300^oc[10⁶K¹]</td><td>5.80*</td><td>6.61</td><td>5.62</td><td>8.34</td>

[0064] Table 1: Examples of sealing glass according to the present invention, the data is based on the weight% of oxides.

[0065]

<td>Components:</td><td>CE 1</td><td>CE 2</td>

<td>Si0₂</td><td>69.8</td><td>68.0</td>

<td>B2O3</td><td>15.6</td><td>13.0</td>

<td></td><td>7.2</td><td>12.0</td>

<td>A12O3</td><td>5.4</td><td>5.0</td>

<td>ZnO</td><td>2.0</td><td>1.0</td>

<td>BaO</td><td>-</td><td>1.0</td>

<td>performance:</td><td></td><td></td>

<td>Tg"C]</td><td>505</td><td>565</td>

<td>Density [g/cm³]</td><td>2.31</td><td>2.44</td>

<td>α20-300Ό[10⁶Κ¹]</td><td>5.2</td><td>6.7</td>

[0066] Table 2: Comparative example of sealing glass, data is based on the weight% of oxide.

[0067] Table 2 shows the composition and physical properties of the sealing glass that is not within the range of the glass composition according to the present invention, which will be referred to as CE 1 and CE 2 as comparative examples hereinafter.

[0068] The glass of the comparative example has a higher content of SiO 2 and a lower content of B 2 O 3 and AI 2 O 3 than the sealing glass according to the present invention.

[0069] The resistance of the sealing glass according to the present invention as shown in Table 1 was measured and compared with the glasses CE1 and CE2 of the comparative example as shown in Table 2. For this purpose, the side length of the glass block composed of the glass is placed in a molten sodium bath at 300 °C for a specific period of time, and the appearance of the sample, the surface structure of the sample, and the mass loss are measured. It is proved that all the sealing glasses according to the present invention as shown in Table 1 are more resistant than the comparative example shown in Table 2, or show a higher coefficient of thermal expansion, which leads to the difference between the metal as a mating sealing member Improve the ability to seal and join.

[0070] The advantages of the sealing glass according to the present invention over the prior art are that it can be used to prepare ceramic and/or metal sealing parts and can also improve its chemical resistance.