Full-field characterization of thermal diffusivity in continuous-fiber ceramic composite materials and components

J. Scott Steckenrider; William A. Ellingson; Scott A. Rothermel

doi:10.1117/12.204856

28 March 1995 Full-field characterization of thermal diffusivity in continuous-fiber ceramic composite materials and components

J. Scott Steckenrider, William A. Ellingson, Scott A. Rothermel

Author Affiliations +

Proceedings Volume 2473, Thermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications; (1995) https://doi.org/10.1117/12.204856
Event: SPIE's 1995 Symposium on OE/Aerospace Sensing and Dual Use Photonics, 1995, Orlando, FL, United States

Abstract

Continuous-fiber ceramic matrix composites (CFCCs) are currently being developed for various high-temperature applications, including use in advanced heat engines. Among the material classes of interest for such applications are silicon carbide (SiC)-fiber-reinforced SiC (SiC_(f)/SiC), SiC-fiber-reinforced silicon nitride (SiC_(f)/Si₃N₄), aluminum oxide (Al₂O₃)-fiber-reinforced Al₂O₃ (Al₂O_3(f)/Al₂O₃), and others. In such composites, the condition of the interfaces (between the fibers and matrix) are critical to the mechanical and thermal behavior of the component (as are conventional mechanical defects such as cracks, porosity, etc.). For example, oxidation of this interface (especially on carbon coated fibers) can seriously degrade both mechanical and thermal properties. Furthermore, thermal shock damage can degrade the matrix through extensive crack generation. A nondestructive evaluation method that could be used to assess interface condition, thermal shock damage, and to detect other `defects' would thus be very beneficial, especially if applicable to full-scale components. One method under development uses infrared thermal imaging to provide `single-shot' full-field assessment of the distribution of thermal properties in large components by measuring thermal diffusivity. By applying digital image filtering, interpolation, and least-squares-estimation techniques for noise reduction, we can achieve acquisition and analysis times of minutes or less with submillimeter spatial resolution. The system developed at Argonne National Laboratory has been used to examine the effects of thermal shock, oxidation treatment, density variations, and variations in oxidation resistance coatings in a full array of test specimens. Subscale CFCC components with nonplanar geometries have also been studied for manufacturing-induced variations in thermal properties.

Citation Download Citation

J. Scott Steckenrider, William A. Ellingson, and Scott A. Rothermel "Full-field characterization of thermal diffusivity in continuous-fiber ceramic composite materials and components", Proc. SPIE 2473, Thermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, (28 March 1995); https://doi.org/10.1117/12.204856

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