Rolling Contact Fatigue of Hot-Pressed Silicon Nitride Versus Surface Preparation Techniques
Hot-pressed silicon nitride is receiving interest as a potential antifriction bearing material1. As a result of advanced material preparation and processing techniques, bend strengths in excess of 100,000 psi are routinely achieved. In addition to its high strength, dimensional stability and corrosion resistance, silicon nitride has a density of 3.2 g/cm3, sixty percent lower than that of steel. This light weight is especially important for high speed bearings, where the maximum stresses occur in the outer race, primarily as a result of the centrifugal force loading from the rolling elements. Inasmuch as strength tends to be sensitive to surface integrity, finishing procedures are an important aspect for bearing applications. This paper will report experiments on their effect.
KeywordsFatigue Life Silicon Nitride Rolling Contact Contact Fatigue Stress Cycle
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