Silicon Nitride Ball Bearing Demonstration Test.
PRATT AND WHITNEY AIRCRAFT WEST PALM BEACH FLA FLORIDA RESEARCH AND DEVELOPMENT CENTER
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A 35-mm bore angular contact ball bearing having M50 tool steel races and hot-pressed silicon nitride balls was tested at speeds to 71,500 rpm 2.5-million DN. The bearing ran smoothly throughout 32 hr of accumulated time. Heat generation was 10 to 20 lower than that of a comparable bearing with steel balls, and the silicon nitride bearing required 30 less axial load at the inception of ball skid. The silicon nitride balls and steel raceways were in excellent condition after the test.
- Machinery and Tools