Double-layer lubrication coating composition, double-layer lubrication coating and piston having same coating

摘要

A double-layer lubrication coating composition is made up of an upper-layer coating composition and a lower-layer coating composition. The upper-layer coating composition is made up of 5o to 70 wt% of an epoxy resin or a polyamide-imide resin, 5 to 20 wt% of boron nitride, and 15 to 30 wt% of silicone nitride or alumina. The lower-layer coating composition is made up of 50 to 70 wt% of an epoxy resin or a polyamide-imide resin, 15 to 30 wt% of polytetrafluoroethylene and 5 to 20 wt% of molybdenum disulfide and may include graphite as required.