期刊
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
卷 43, 期 -, 页码 89-93出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2013.11.009
关键词
Composite materials; Powder metallurgy; Sintering; Ablation properties; Microstructure
资金
- NSL (National Space Lab.) program through the Korea Science and Engineering Foundation [NRF-2008-2003213]
- Priority Research Centers Program through the National Research Foundation of Korea (NRF)
- Ministry of Science, ICT & Future Planning [2011-0031407]
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.
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