Patent ID: 8871354

Claim:
A copper-based sliding material comprising a steel back-metal layer and a Cu alloy layer, the Cu alloy layer consisting of, by mass %, greater than 10 to 30% of Bi particles, 0.5 to 5% of particles of an inorganic compound, optionally 0.5 to 5% of Sn, optionally at least one element selected from the group consisting of Ni, Fe, P and Ag in a total amount of 0.1 to 10%, and the balance being Cu and inevitable impurities, wherein the inorganic compound has an average particle size of 1 to 5 μm and a specific gravity of 70 to 130% relative to the specific gravity of Bi, and wherein the Bi particles are in the Cu alloy layer in an average particle size of 2 to 15 μm, and the Bi phase is dispersed in the Cu alloy layer and isotropic wherein an average value of x/y is 1 to 2 where x is an average length of the Bi particles in a x-axis direction and y is an average length of the Bi particles in a y-axis direction where the x-axis is taken in a thickness direction of the Cu alloy layer and the y-axis is perpendicular to the x-axis.