Laser ultrasonic measurements on ceramic materials with rough surfaces

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:7155747

Walter, J B; Telschow, K L

At the Idaho National Engineering Laboratory, noncontacting ultrasonic measurements are being made on materials while they are being processed at elevated temperatures. These materials have rough surfaces, typical of those encountered during processing. A pulsed laser is used for generation of elastic waves and a laser Doppler interferometer for detection. Processes being studied are the fabrication of silicon carbide fiber reinforced silicon carbide (SiC--SiC) by chemical vapor infiltration (CVI) and the sintering of zinc oxide (ZnO). For SiC-SiC produced by CVI, the velocity and wave amplitude of elastic waves propagating through the sample have been found to depend on the porosity and on the fiber-matrix interface bond strength. Surface waves on this material are affected by the density of the near surface layer, which can be substantially greater than that of the interior for many CVI processes. Data are also presented for the sintering of ZnO, where the laser ultrasonic method is used to monitor density and shrinkage in real time. 3 refs., 7 figs.

• Research Organization: EG and G Idaho, Inc., Idaho Falls, ID (USA)
• Sponsoring Organization: DOE/NE; DOI
• DOE Contract Number: AC07-76ID01570
• OSTI ID: 7155747
• Report Number(s): EGG-M-89514; CONF-900736--1; ON: DE90012961; CNN: J0134035
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ACOUSTIC TESTING
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COMPOSITE MATERIALS
FABRICATION
FABRY-PEROT INTERFEROMETER
FIBERS
INTERFEROMETERS
MATERIALS
MATERIALS TESTING
MEASURING INSTRUMENTS
MONITORING
NONDESTRUCTIVE TESTING
OXIDES
OXYGEN COMPOUNDS
POROSITY
SILICON CARBIDES
SILICON COMPOUNDS
SINTERING
TESTING
ULTRASONIC TESTING
WAVE PROPAGATION
ZINC COMPOUNDS
ZINC OXIDES