Chemical vapour growth of HfC whiskers and their morphology |
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Authors: | S Motojima Y Kawashima |
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Affiliation: | (1) Department of Applied Chemistry, Faculty of Engineering, Gifu University, 501-11 Gifu, Japan |
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Abstract: | HfC whiskers were prepared from a gas mixture of HfCl4 + CH4 + H2 + Ar in the presence of metal impurities, and the growth conditions and morphology were examined. The HfC whiskers preferentially grew at an H/Cl ratio of above 8, an HfCl4 gas flow rate of 10–20 standard cm3 min–1, a CH4 flow rate of 10–20 standard cm3 min–1, and at temperatures above 1050 °C. HfC whiskers, 60–170 m long, with a ball-like tip and periodically varying diameters, were obtained at 1250 °C using a cobalt impurity. |
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