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Evidence for High‐Temperature Forms of Zirconium and Tantalum Monocarbides
Author(s) -
SHAFFER PETER T. B.
Publication year - 1963
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1963.tb11710.x
Subject(s) - tantalum , zirconium , materials science , tantalum carbide , carbide , zirconium carbide , niobium carbide , electrical resistivity and conductivity , metallurgy , mineralogy , chemistry , electrical engineering , engineering
Evidence has been 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 emisivity, 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° 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.