Nondestructive evaluation techniques for high-temperature ceramic components. Fifth quarterly report, October--December 1978

Technical Report · Mon Jan 01 00:00:00 EST 1979

DOI:https://doi.org/10.2172/6397615· OSTI ID:6397615

The adequacy of several nondestructive evaluation (NDE) techniques for the detection of flaws in SiC heat-exchanger tubing are discussed. Experimental results regarding adaptability to ceramic tubing and minimum detectable flaw size have been obtained for conventional ultrasonic testing, acoustic microscopy, conventional and dye-enhanced radiography, holographic interferometry, infrared scanning and internal-friction measurements. The advantages and disadvantages of overload proof testing are also discussed. No single NDE technique will be sufficient to detect all types of critically sized flaws. Preservice inspection should include traditional visual and dye-penetrant examinations for outer-wall surface defects, and possibly overload proof testing to screen weak ceramic tubing. Further examinations should employ dye-enhanced radiography for inner-wall surface defects and acoustic microscopy or conventional ultrasonic testing at 20 MHz (and possible holographic interferometry) for subsurface defects. Anomalous heat-transport characteristics may be detected by infrared techniques. For in-service examinations, where is is assumed that access to the tube is from the bore side only, inspection employing 20-MHz longitudinal and transverse waves appears to be the most practical technique. Infrared scanning through the bore could possibly provide data with regard to hot spots, wall thinning and anomalous heat-transport characteristics. Holographic interferometry, while requiring extensive development, may be capable of providing inner-wall crack-detection data not generated by other techniques.The attributes of the various techniques evaluated to date are tabulated.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 6397615
• Report Number(s): ANL/MSD-79-1
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
HEAT EXCHANGERS
TUBES
SILICON CARBIDES
NONDESTRUCTIVE TESTING
ACOUSTIC TESTING
CERAMICS
DEFECTS
HIGH TEMPERATURE
HOLOGRAPHY
INDUSTRIAL RADIOGRAPHY
INFRARED THERMOGRAPHY
INTERFEROMETRY
RESEARCH PROGRAMS
ULTRASONIC TESTING
CARBIDES
CARBON COMPOUNDS
MATERIALS TESTING
SILICON COMPOUNDS
TESTING
THERMAL TESTING
THERMOGRAPHY
420500* - Engineering- Materials Testing