The ever increasing requirements for energy savings, environmental protection and high efficiency from the industry lead to ever more severe operating conditions for rolling bearings, such as higher rotation speeds, higher loads, and better corrosion resistance. Engineering ceramics, such as silicon nitride, zirconia, silicon carbide and alumina have superior characteristics to meet these requirements. Silicon nitride, in particular, has excellent balance of properties for rolling bearing applications, such as light weight, high hardness, electrical insulation and corrosion resistance. This paper describes the manufacturing method and material characteristics of silicon nitride, its basic performance and examples of applications in rolling bearings.
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