Infrared-based NDE methods for determining thermal properties and defects in ceramic composites

Conference · Thu Aug 01 04:00:00 EDT 1996

OSTI ID:270805

Ahuja, S; Ellingson, W A ^[1]; Steckenrider, J S ^[2]; Koch, S ^[3]

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1. Argonne National Lab., IL (United States). Energy Technology Div.
2. Northwestern Univ., Evanston, IL (United States)
3. Univ. of Michigan, Ann Arbor, MI (United States)

Continuous-fiber ceramic matrix composites are currently being developed for various high temperature applications, including use in advanced heat engines. In the material classes of interest for such applications, i.e., silicon carbide (SiC)-fiber-reinforced SiC (SiC{sub (f)}/SiC), SiC-fiber-reinforced silicon nitride (SiC{sub (f)}/Si{sub 3}N{sub 4}), Al{sub 2}O{sub 3 (f)}/Al{sub 2}O{sub 3}, etc., the condition of the interface between the fibers and matrix is critical to the mechanical and thermal behavior of each component. A nondestructive evaluation method developed at Argonne National Laboratory uses infrared thermal imaging to provide ``single-shot`` full-field measurement of the distribution of thermal diffusivity in large components. By applying digital filtering, interpolation, and least-squares-estimation techniques for noise reduction, the authors have achieved acquisition and analysis times of minutes or less with submillimeter spatial resolution. The system has been used to examine the effects of thermal shock, oxidation treatment, density, and variations in fiber coatings in a full array of test specimens.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 270805
• Report Number(s): ANL/ET/CP--90230; CONF-960106--13; ON: DE96012807
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
ALUMINIUM OXIDES
COMPOSITE MATERIALS
DAMAGE
DATA ACQUISITION
DATA ANALYSIS
DIGITAL FILTERS
HEAT RESISTANT MATERIALS
IMAGES
INFRARED RADIATION
INFRARED THERMOGRAPHY
LEAST SQUARE FIT
NONDESTRUCTIVE TESTING
SILICON CARBIDES
SILICON NITRIDES
THERMAL DIFFUSIVITY
THERMAL SHOCK