Nondestructive Evaluation of Ceramics
Abstract
An ultrasonic nondestructive evaluation (UNDE) techniques was developed to successfully detect small defects in gas turbine quality ceramic materials. A high frequency (25-45 MHz), longitudinal wave mode, pulse- reflection UNDE method was developed to evaluate a range of densities (2.2 to 3. 2 g/cc) of ceramics (reaction bonded Si3N4, sintered SiC, hot pressed Si3N4 and hot pressed SiC) for various types of defects (open pores and seeded inclusions of low (Al2O3) and high (WC) densities) of various small sizes (10 to 130 micrometers). Conventional mechanical tests were also performed to verify defect sizes and to correlate material strength with UNDE results.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 19, 1976
- Accession Number
- ADA027357
Entities
People
- I. M. Matay
- T. Derkacs
- W. D. Brentnall