Elevated temperature ablation resistance of HfC particle-reinforced tungsten composites

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The effects of adding HfC particles on the ablation resistance of HfC-W composites were investigated. An oxyacetylene torch was used to ablate the samples at high temperature. Ablation resistance improved with an increasing volume fraction of HfC particles, with a value of 15.7 x 10(-3) g/cm(2).s at 30 vol.%. The mass ablation rates of the composites were much lower than those of monolithic tungsten. The improvement in ablation resistance was attributed to thermochemical oxidation of the W and HfC particles, forming an HfO2 layer on the surface. The outstanding elevated temperature ablation resistance of HfC-W was attributed to the low thermal conductivity, high oxidation resistance, and high melting point of the HfC reinforcement. (C) 2013 Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2014-03
Language
English
Article Type
Article
Keywords

MECHANICAL-PROPERTIES; MATRIX COMPOSITES; BEHAVIOR; W-LA2O3; CERMETS

Citation

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, v.43, pp.89 - 93

ISSN
0263-4368
DOI
10.1016/j.ijrmhm.2013.11.009
URI
http://hdl.handle.net/10203/187266
Appears in Collection
NE-Journal Papers(저널논문)MS-Journal Papers(저널논문)
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