Tungsten disulfide coating can be used to treat three important parts of automobile engine---piston, piston ring and piston pin---with its good lubricating performance. These three parts are closely connected with the running of engine.

Tungsten disulfide has a molecular formula of WS₂ and a molecular weight of 247.97. It is a compound of tungsten and sulfur with grey metallic luster. Tungsten disulfide has properties including anisotropy, reactivity and catalytic activity, which make it an important material in petroleum industry and other fields.

Tungsten disulfide has a molecular formula of WS₂ and a molecular weight of 247.97. Lubricity, conductivity and optical properties of tungsten disulfide make it an important material in mechanical lubrication and other relevant fields.

Metal matrix composites (MMCs) have attracted more and more attention, and their reinforcements are generally particles, whiskers (or short fibers) and fibers. Metal matrix composites have higher specific strength, specific stiffness and high temperature strength than their matrix alloys. The preparation methods mainly include powder metallurgy sintering method and casting method (injection moulding).