Development of nondestructive evaluation techniques for high-temperature ceramic heat exchanger components. Twelfth quarterly report, July-September 1980

Technical Report · Wed Oct 01 00:00:00 EDT 1980

DOI:https://doi.org/10.2172/6747700· OSTI ID:6747700

Detection of electric-discharge machined notches in a silicon carbide tube by an ultrasonic bore-side probe under microcomputer control has been demonstrated. Use of the reflection mode has been shown to enhance the sensitivity of flaw detection with an acoustic microscope. In this configuration, the transducer and laser-scanned coverslip are both on the tube outer surface, eliminating the need to fill the tube with water. A conceptual design is presented for inspecting tubes up to seven feet long in both through-transmission and reflection-mode configurations. A comparison of NDE techniques for ceramic butt joints showed holographic interferometry to be generally better than dye-penetrant, radiographic, or ultrasonic techniques for characterizing a crack-like inner-wall defect. Pitch-catch and pulse-echo ultrasonic techniques also indicated the presence of an anomaly in the region identified as flawed via holography, while radiographic and penetrant-testing results were ambiguous.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 6747700
• Report Number(s): ANL/MSD/FE-80-7
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
36 MATERIALS SCIENCE
CERAMICS
NONDESTRUCTIVE TESTING
HEAT EXCHANGERS
MATERIALS
ACOUSTICS
COMPARATIVE EVALUATIONS
DEFECTS
DETECTION
EXPERIMENTAL DATA
HOLOGRAPHY
INSPECTION
SILICON CARBIDES
CARBIDES
CARBON COMPOUNDS
DATA
INFORMATION
MATERIALS TESTING
NUMERICAL DATA
SILICON COMPOUNDS
TESTING
420400* - Engineering- Heat Transfer & Fluid Flow
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication