Patent ID: 9664281
Date: 2017-05-30
CPC Classifications: C22C,C23C,F02F,F16J,Y10T

Claim:
1. A thermal spray coating for piston ring, the thermal spray coating being obtained by thermally spraying a powder composition on an outer peripheral sliding surface of a piston ring base material, wherein the powder composition contains molybdenum particles, nickel chromium alloy particles, and chromium carbide particles; a median diameter of the chromium carbide particles is 5 to 25 μm; the powder composition is thermally sprayed on the outer peripheral sliding surface of the piston ring base material by a plasma spraying method; and the thermal spray coating has a structure such that, from a perspective of a cross section vertical to the outer peripheral sliding surface of the thermal spray coating, the molybdenum layer, the nickel chromium alloy layer and the chromium carbide layer are layered upon one another in an undulating wave-like structure, and the layers are entangled with each other.