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US 5,508,241 AGranted
Silicon nitride bearing ball having a high rolling contact fatigue life
AssigneeSaint-Gobain/Norton Industrial Ceramics Corporation
InventorRussell L. Yeckley
Life of this patent
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Abstract
A sintered silicon nitride ceramic having an L10 value of at least 50 million stress cycles in ASTM test STP 771 under 6.9 GPa applied contact stress.
Claims8
A sintered silicon nitride ball bearing consisting essentially of:
- a) at least about 94 w/o of a crystalline phase of silicon nitride, and
- b) a single grain boundary phase consisting essentially of Mg, Al, Si and O,
- wherein the grain boundary phase consists essentially of between 1 and 2 w/o Mg, as magnesia;
- between 0.2 and 1.0 w/o Al, as alumina;
- between 2 and 4 w/o Si, as silica;
- and oxygen.
3 more elements
Dependencies are inferred from the claim text.