has
been widely used in bearing applications due to its
goodchemical stability, biocompatibility, andfriction
reducing and antiwear ability [2]. It has also been used
as some components or parts of machines in chemical
engineering, textile engineering, transportation engineering,
agricultural engineering, foodprocessing, and
the paper making industry, because of its excellent
chemical corrosion resistance, water-repellent function,
adhesion resistance, and self-lubricity