Abstract
Two types of Si-Ti-C-O fibres were heat treated in a preheated graphite furnace at temperatures between 1273 and 1973 K, and the change in the electrical resistivity was measured after removing the fibres from the furnace. The resistivity of the fibres decreased monotonically with increasing heat-treatment temperature, but showed a significant increase of the order of 101–102 in the temperature range of gas evolution from the fibres. The resistivity of the fibre which has an amorphous character began to increase at a lower temperature than that of the fibre with a crystalline character. This increase in resistivity did not occur during heat treatment in a pure oxygen atmosphere, because the oxide layer formed on the fibre surface suppressed gas evolution from the fibres. The X-ray diffraction patterns of heat-treated fibres in nitrogen or oxygen atmospheres revealed that β-SiC crystals began to precipitate from the amorphous state as the heat-treatment temperature increased. The β-SiC crystal growth, however, did not always correspond with the decrease in the fibre resistivity.
Similar content being viewed by others
References
S. YAJIMA, K. OKAMURA, T. MATSUZAWA, Y. HASEGAWA and T. SHISHIDO, Nature 279 (1979) 706.
S. YAJIMA, Ceram. Bull. 62 (1983) 893.
J. F. VILLENEUVE, D. MOCAER, R. PAILLER and R. NASLAIN, J. Mater. Sci. 28 (1993) 1227.
M. MONTHIOUX, A. OBERLIN and E. BOUILLON, Compos. Sci. Technol. 37 (1990) 21.
E. BOUILLON, F. LANGLAIS, R. PAILLER, R. NASLAIN, F. CRUEGE, P. V. HUONG, J. C. SARTHOU, A. DELPUECH, C. LAFFON, P. LAGARDE, M. MONTHIOUX and A. OBERLIN, J. Mater. Sci. 26 (1991) 1333.
N. MUTO, M. MIYAYAMA, H. YANAGIDA, T. KAJIWARA, N. MORI, H. ICHIKAWA and H. HARADA, J. Am. Ceram. Soc. 73 (1990) 443.
C. J. CHU, S. J. TING and J. D. MACKENZIE, in “Springer Proceedings in Physics 56 (Amorphous and Crystalline Silicon Carbide III), edited by G. L. Harris, M. G. Spencer and C. Y. Yang (Springer, 1992) p. 93.
T. YAMAMURA, T. ISHIKAWA, M. SHIBUYA, T. HISAYUKI and K. OKAMURA, J. Mater. Sci. 23 (1988) 2589.
K. KAKIMOTO, T. SHIMOO, K. OKAMURA, T. SEGUCHI, M. SATO, K. KUMAGAWA and T. YAMAMURA, J. Jpn Inst. Metals 58 (1994) 229.
T. SHIMOO, M. SUGIMOTO, Y. KAKEHI and K. OKAMURA, ibid. 55 (1991) 294.
Y. HASEGAWA and K. OKAMURA, J. Mater. Sci. 18 (1983) 3633.
C. VALHAS, C. BOURGETTE, P. LE COUSTUMER and M. MONTHIOUX, in “Proceedings of the 6th European Conference on Composite Materials (High Temperature Ceramic Matrix Composites, HT-CMCI)”, Bordeaux, September 1993, edited by R. Naslain, J. Lamon and D. Doumeingts (Woodhead, 1993) p. 67.
Y. SASAKI, Y. NISHINA, M. SATO and K. OKAMURA, J. Mater. Sci. 22 (1987) 443.
K. KAKIMOTO, T. SHIMOO and K. OKAMURA, J. Am. Ceram. Soc., submitted.
Idem, J. Jpn Inst. Metals 57 (1993) 957.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Narisawa, M., Itoi, Y. & Okamura, K. Electrical resistivity of Si-Ti-C-O fibres after rapid heat treatment. Journal of Materials Science 30, 3401–3406 (1995). https://doi.org/10.1007/BF00349886
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00349886