EVIDENCE FOR HIGH-TEMPERATURE FORMS OF ZIRCONIUM AND TANTALUM MONOCARBIDES
Journal Article
·
· Journal of the American Ceramic Society (U.S.)
Evidence was found which suggests the existence of high-temperature crystalline modifications of both zirconium carbide and tantalum carbide. The high-temperature inversion in zirconium carbide, indicated by a sharp decrease in spectral emissivity, in electrical resistivity, and in density, was reversible. No permanent changes in microhardness or in x-ray diffraction patterns were found after cooling to room temperature. Emissivity measurements showed a hysteresis effect of approximately 400 deg C for zirconium carbide. A similar, although less sharply defined, effect was noted for tantalum carbide. No such effect was found in solid solutions of these two monocarbides. (auth)
- Research Organization:
- Carborundum Co., Niagara Falls, N.Y.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-027835
- OSTI ID:
- 4714212
- Journal Information:
- Journal of the American Ceramic Society (U.S.), Journal Name: Journal of the American Ceramic Society (U.S.) Vol. Vol: 46; ISSN JACTA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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