Accession Number:

ADA317379

Title:

Ceramic Bearing Development, Vol 2. Development of Surface Acoustic Wave NDE for Silicon Nitride Balls.

Descriptive Note:

Interim rept. 1 Jul 92-1 Oct 94,

Corporate Author:

NORTON ADVANCED CERAMICS EAST GRANBY CT

Report Date:

1995-03-01

Pagination or Media Count:

61.0

Abstract:

The Major Objective of the Development of a Surface Acoustic Wave Nondestructive Evaluation NDE Technique for Silicon Nitride Balls was to improve hybrid bearing reliability by the elimination of critical size flaws that cause early failures. A Surface Acoustic Wave NDE technique was developed for Norton Advanced Ceramics NBD-200 silicon nitride balls. System performance was verified on balls with both natural and artificial flaws. A production lot of NBD-200 balls was tested using this method. The production lot was sorted for fatigue testing at 2.9 MPa 420 KSI contact stress at The Timken Co. Results suggest that the technique can readily identify certain life limiting flaws. However, fatigue testing of balls inspected with this technique showed no improvement in reliability.

Subject Categories:

  • Line, Surface and Bulk Acoustic Wave Devices
  • Inorganic Chemistry
  • Refractory Fibers
  • Machinery and Tools

Distribution Statement:

APPROVED FOR PUBLIC RELEASE