Coating composition for use in sliding parts
View Patent ↗A compressor includes a swash plate, and a shoe connected to an outer periphery of the swash plate. A surface of the swash plate slides upon a flat surface of the shoe. A sliding film is applied to the surface of the swash plate. The sliding film is formed of binder resin which contains a solid lubricant and titanium oxide powder. This allows the surface of the swash plate and the flat surface of the shoe to smoothly slide upon each other.
1. A wear resistant and seizure resistant film, wherein the film is formed of a coating composition comprising a binder resin, which is polyimide or polyamide-imide, a solid lubricant of polytetrafluoroethylene in an amount of from 15% by mass to 100% by mass based on 100% by mass of the binder resin, titanium oxide powder particles in an amount of from 7.7% by mass to 30.8% by mass based on 100% by mass of the binder resin, and a silane coupling agent in an amount of from 0.2% by mass to 7.7% by mass based on 100% by mass of the binder resin, the solid lubricant, the titanium oxide powder particles and the silane coupling agent being dispersed in the binder resin of the film, and the average primary particle diameter of the titanium oxide powder particles being 1 μm or less, wherein the film is adapted to be formed on a sliding part by applying the coating composition to the sliding part and curing the applied coating composition.
2. The film according to claim 1 , wherein the content of the polytetrafluoroethylene relative to the binder resin is in the range between 30% by mass and 80% by mass, inclusive, based on 100% by mass of the binder resin.
3. The film according to claim 1 , wherein the content of the titanium oxide powder particles relative to the binder resin is in the range between 10% by mass and 20% by mass, inclusive, based on 100% by mass of the binder resin.
4. The film according to claim 1 , wherein the content of the silane coupling agent relative to the binder resin is in the range between 2% by mass and 8% by mass, inclusive, based on 100% by mass of the binder resin.
5. The film according to claim 1 , wherein the sliding parts are metal sliding parts.
6. The film according to claim 1 , wherein:
the content of the polytetrafluoroethylene relative to the binder resin is in the range between 20.0% by mass and 76.0% by mass, inclusive, based on 100% by mass of the binder resin;
the content of the titanium oxide power particles relative to the binder resin is in the range between 7.7% by mass and 30.8% by mass, inclusive, based on 100% by mass of the binder resin; and
the content of the silane coupling agent relative to the binder resin is in the range between 0.2% by mass and 7.7% by mass, inclusive, based on 100% by mass of the binder resin.
7. The film according to claim 6 , wherein the content of the titanium oxide powder particles relative to the binder resin is not less than 15.4% by mass based on 100% by mass of the binder resin.
8. The film according to claim 6 , wherein the content of the polytetrafluoroethylene relative to the binder resin is not less than 30.1% by mass based on 100% by mass of the binder resin.
9. The film according to claim 6 , wherein the content of the silane coupling agent relative to the binder resin is not less than 1.5% by mass based on 100% by mass of the binder resin.