Zirconia ceramic ball has a density, high strength, wear resistance, corrosion resistance, coefficient of thermal expansion, high grinding efficiency, low noise, long life, non-staining material advantages. Quality to adapt to a variety of grinding machinery grinding media. Zirconia ceramic is a new type of bearing materials, can be applied to conventional bearings in precision machine tools, high-speed motor, automobile, air conditioners, can also be used in petroleum, chemical, aerospace, marine, and other high-tech fields; may also be based on user requirements production made ​​spool valve body, collar, pipe, plate