Patent ID: 8960072
Filing Date: 2015-02-24
Classification: F16J,Y10T

Abstract:
1. A multilayer lubrication coating film formed on an outer surface of an object to be coated, the coating film comprising: a lower-layer coating film formed on the outer surface of an object to be coated; and an upper-layer coating film formed directly on a surface of the lower-layer coating film, wherein the upper-layer coating film is formed using a composition made of 50 to 70 mass % of at least one of an epoxy resin and a polyamide-imide resin as bonding resins, 5 to 20 mass % of boron nitride as a solid lubricant, and 15 to 30 mass % of at least one of silicon nitride and alumina as hard particles, wherein the lower-layer coating film has a Vickers hardness higher than a Vickers hardness of the object to be coated for protection of the outer surface of the object to be coated against damage caused due to abrasion by a foreign matter acting as a grinding material penetrating through the upper-layer coating film, and wherein the object to be coated is made of an aluminum alloy, and the lower-layer coating film is an iron plated film.