Ceramic bearing development. Volume 1. Fatigue and wear behavior of NBD-200 silicon nitride balls. Interim report, 1 August 1992-1 October 1994
These are the test results of the fatigue and wear performance of NBD-200, silicon nitride balls under conditions of rolling contact in ball bearings. Life testing was done under conditions of load and EHD film thickness equal to or more severe than those to be expected in turbine engine mainshaft applications. The actual temperatures and speeds of those applications were not simulated. No fatigue failures occurred in a sample of 556 `standard` NBD-200 balls within a test limit of five times the experimentally - determined L-10 life of the AISI 52100 steel balls. Ball failures did occur in a sample of balls identified by a Surface Acoustic Wave NDE technique as being flawed, but the correspondence between the estimated severity of the flaws and the specific ball failures was not good. A Thermal Proof Testing technique for eliminating balls with flaws may possibly have promoted failures of balls that otherwise would have performed satisfactorily. Wear tests, performed under moderate to severe boundary lubrication conditions showed no measurable, `conventional` wear. The life - limiting factor in these hybrid bearings was microspalling of the AISI 52100 and M-50 steel races.
- Research Organization:
- Norton Advanced Ceramics, East Granby, CT (United States)
- OSTI ID:
- 445722
- Report Number(s):
- AD-A-318154/2/XAB; CNN: Contract F33615-92-C-5917; TRN: 70490301
- Resource Relation:
- Other Information: PBD: Mar 1995
- Country of Publication:
- United States
- Language:
- English
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