The abrasion resistance of ceramic structural parts made of alumina material is also a qualitative leap compared with common steel structural parts. The degree of wear resistance is several hundreds to thousands of times that of steel structural parts. Alumina ceramics have good stability and high melting point. Alfa alumina does not react with strong acids and bases, and its melting point is as high as 2054 degrees Celsius. Alumina ceramics have excellent biocompatibility and can be directly used in humans and organisms.