Patent ID: 11905586
Assignee: TOHKEN THERMO TECH CO., LTD
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A low friction wear film comprising:
a chromium layer provided on a surface of a metal substrate;
a tungsten carbide layer provided on a surface of the chromium layer, the tungsten carbide layer including a chromium-tungsten carbide gradient layer and a tungsten carbide uniform layer, the chromium-tungsten carbide gradient layer containing chromium and tungsten carbide and having a gradient composition in which a composition ratio of the chromium decreases and a composition ratio of the tungsten carbide increases as a distance from the chromium layer in a thickness direction increases, the tungsten carbide uniform layer being only made of tungsten carbide provided on a surface of the chromium-tungsten carbide gradient layer, and in the tungsten carbide layer, a tungsten-concentrated layer in which a tungsten simple substance is present is not provided at a boundary between the chromium-tungsten carbide gradient layer and the tungsten carbide uniform layer; and
a diamond-like carbon layer as a top layer provided on a surface of the tungsten carbide layer.