Coating method and coating for a bearing component
View Patent ↗A coating method for producing an electrically insulating coating on a bearing component, wherein, in a first step, a substance mixture comprising at least a) a silane and/or siloxane compound, b) a metal alcoholate, and c) PEEK and/or PTFE in the form of a dispersion is applied to the bearing component and, in a second step, is solidified on the component surface by means of a laser beam.
1. A coating method for producing an electrically insulating coating on a bearing component, comprising:
applying in a first step a composition including at least: a) a silane and/or siloxane compound, b) a metal alkoxide, and c) polyether ether ketone or polytetrafluoroethylene as a dispersion to a surface of the bearing component; and
consolidating the composition in a second step by a laser beam to form an electrically-insulating layer on the surface of the component.
2. The coating method as recited in claim 1 further comprising drying in an intermediate step, located temporally between the first step and the second step, the composition at a temperature of between 100 and 200° C.
3. The coating method as recited in claim 1 wherein the composition further comprises an organic colorant.
4. The coating method as recited in claim 3 wherein the organic colorant comprises carbon black.
5. The coating method as recited in claim 1 wherein the applied composition has a thickness at least twice a wavelength of the laser beam used in the second step.
6. The coating method as recited in claim 1 wherein the first and second steps are carried out under inert gas atmosphere or vacuum.
7. The coating method as recited in claim 1 wherein a temperature during the first and second steps does not exceed a tempering temperature of a material of the bearing component.
8. The coating method as recited in claim 1 wherein the coating method is used to apply a coating 1 to 10 μm thick to the bearing component.
9. The coating method as recited in claim 1 wherein the first step forms a sol-gel layer.
10. The coating method as recited in claim 1 wherein the electrically-insulating layer is pore free.
11. The coating method as recited in claim 1 wherein the silane and/or siloxane compound is an acyloxysilane, alkylsilane, aminosilane, bis-silyl-silane, epoxysilane, fluoro-alkylsilane, glycidyloxysilane, isocyanato-silane, mercapto-silane, (meth)acrylato-silane, sulfur-containing silane, ureidosilane, or vinylsilane, and/or a corresponding siloxane.
12. The coating method as recited in claim 1 wherein the silane and/or siloxane compound is an organically modified silane.
13. The coating method as recited in claim 12 wherein the organically modified silane is one of tetraethoxyorthosilane, methyltriethoxysilane or methacryloyloxypropyltrimethoxysilane.