Process for the preparation of a ceramic protective layer

0001The invention relates to a method for applying a ceramic layer on metallic or metallized surfaces.

0002A known method for producing such layers is the sol-gel process, in which a solution with microparticles, for example, a mixture of Zirconium and silicon oxide produced and the formation of a gel phase on a is coated and dried substrate. To produce a hard and scratch-resistant Layer is a necessary annealing at elevated temperature. are usually thereby applied temperatures between 150 and 400 ° C ([2]).

0003Object of the present invention is to provide a simple method without Heat treatment to offer with UV-resistant and scratch-resistant and also under deformation tightly adherent coatings can be produced.

0004This object is specified in the claims with the resolved features. It has been found that when using a simple wet coating Normal temperature in a short treatment time is a very tenacious, and shock- scratch-resistant coating can be made of high-quality ceramic.

0005In the following the invention using an exemplary embodiment will be explained. It show:<dl tsize="10"><dt>Fig. 1:</dt><dd>Representation of the process sequence</dd><dt>2a, b.:</dt><dd>Cross sections of inventively constructed, coated substrates (Schematics) </dd><dt>Fig. 3:</dt><dd>Force microscope (AFM) image of a quartz glass surface</dd><dt>Figure 4:</dt><dd>AFM image of a coated quartz glass similar to Fig. 2b</dd><dt>Fig. 5:</dt><dd>AFM image of a coated quartz glass analogously to 2a</dd></dl>

0006The procedure for producing a ceramic layer of the invention is the refer principle images in Figs. 1 and 2 1 shows the following Process steps:<sl><li>pickling 1.1 Surface</li><li>produce 1.2 halide / metal alkoxide</li><li>treat 1.3 surface</li><li>add 1.4 peroxide</li><li>dry surface 1.5</li></sl>

0007The illustration in Figure 2a is the construction of an optical glass ersichtlich.Mit 1 is a transparent ceramic layer with a metal layer 2 and 3 with the optical Glass bezeichnet.Alternativ this 2b shows the situation with a friction-bearing coating 4, which has a very low coefficient of friction / friction factor .The Coating 4 is applied to the metallized surface of a bearing metal. Figures 3 to 5 show AFM images of layers in accordance with the Principle images according to the invention provided with a wet coating of zirconium dioxide were.

0008Figure 3 shows the untreated quartz glass surface. After metallization is replaced one smooth by varying the concentration and reaction time for optical Applications suitable coatings (s. Fig. 4) to the spherical bearing for friction coatings suitable surface structures (s. Fig. 5).