... than 50 years history, is specialize in studying and producing advanced ceramic, such as Zirconia Ceramic, Silicon nitride Ceramic, Alumina Ceramic, etc.The quality system has passed SGS ... Al2O3, ZrO2,SiC, Si3N4 material .Specification Zirconia ceramic are applicated as shaft bearing ,plunger,sealing matetial and knife, with high density, hardess ,bending strength ...