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Rolling-element fatigue life of silicon nitride balls: Preliminary test results (1972)

Zaretsky, E. V. ; Parker, R. J.

In: CASI

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Publication Date: 2019-06-27

Description: Hot pressed silicon nitride was evaluated as a rolling element bearing material. The five-ball fatigue tester was used to test 12.7 mm (0.500 in.) diameter balls at a maximum Hertz stress of 800,000 psi at a race temperature of 130 F. The fatigue spalls in the silicon nitride resembled those in typical bearing steels. The ten-percent fatigue life of the silicon nitride balls was approximately one-eighth to one-fifth that of typical bearing steels (52100 and M-50). The load capacity of the silicon nitride was approximately one-third that of typical bearing steels. The load capacity of the silicon nitride was significantly higher than previously tested ceramic materials for rolling element bearings.

Keywords: STRUCTURAL MECHANICS

Type: NASA-TM-X-68174 , E-7219

Format: application/pdf

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