Microwave Techniques for Nondestructive Evaluation of Ceramics--Phase II
Abstract
The ability of microwave energy to penetrate some kinds of ceramic materials at frequencies of 100 GHz and higher suggests that microwave techniques may be useful for the nondestructive evaluation (NDE) of such materials. The work described in this report demonstrates the basic feasibility of these techniques for detecting and locating various types of inclusions (including voids) in seeded plates of Si3N4. Inclusions as small as 0.005 inch in diameter have been detected using frequencies near 100 GHz. Microwave cross- polarized C-scan images of inclusions have been obtained with a resolution of about one wavelength (3 mm). Some of these images exhibit distinguishing features for different types of flaws. Various practical aspects that affect the ultimate utility of microwave NDE for ceramics are also discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1979
- Accession Number
- ADA067078
Entities
People
- Alfred J. Bahr
Organizations
- SRI International