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

Technical Report · Wed Oct 01 04:00:00 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., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6747700
• Report Number(s): ANL/MSD/FE-80-7
• Country of Publication: United States
• Language: English

Related Subjects

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