Shanghai Gaoyue Ceramics Company is a joint venture with Shanghai Institute of Ceramics，Chinese Academy of Sciences. The company produces silicon nitride,zirconia,alumina ceramic balls for bearings and other purposes.     Si3N4 is considered as a suitable material for high speed hybrid bearing in ultra high-speed precision spindles of machine tools or in jet turbines of aircraft due to its desirable properties such as lower density, higher hardness, higher elastic modulus
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