期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 35, 期 15, 页码 4073-4081出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2015.08.004
关键词
Hafnium carbides; Nanoparticles; Synthesis; Spark plasma sintering; Densification
资金
- R&D Convergence Program of MSIP (Ministry of Science, ICT and Future Planning)
- NST (National Research Council of Science & Technology) of Republic of Korea [CMIP-13-4-KIMS]
Ultra-fine hafnium carbide powder was synthesized by the carbothermal reduction of HfO2 at 1600 degrees C using the modified spark plasma sintering (SPS) apparatus. The synthesized powder had a fine particle size of about 125 nm and a low oxygen content of below 0.5 wt%. The purity of the powder was >99.9% excluding Zr, and 99.6% when including Zr impurity. The intermediate reactions and particle growth were minimized due to the low synthesis temperature, fast heating/cooling rate and the effect of current during the modified SPS process. A relatively large amount of HfC powder could be synthesized by the new synthesis method (>175 g/day). HfC ceramics with high relative density (>96%) were obtained after sintering the synthesized powder without sintering additives at 2300 degrees C for 30 mm under 100 MPa pressure by SPS. The average grain size of the obtained specimen was about 6 mu m. (C) 2015 Elsevier Ltd. All rights reserved.
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