Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 43, Issue -, Pages 269-275Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2013.12.010
Keywords
WC-Co; Microwave sintering; Densification; Microstructure; Alloying
Funding
- National Natural Science Foundation of China [51274107]
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In this paper, the densification and microstructural evolution of microwave fabricated WC-8Co composites were studied. Experimental results showed that shrinkage rate increased at 1275-1325 degrees C. The shape of most WC grains was turned into truncated trigonal prism at 1300 degrees C for 5 min. The apparent activation energy of WC coarsening in microwave prepared alloy was 84.48 Kcal/mol, which was much lower than that in vacuum sintering. Finally, the local liquid phase sintering mechanism of microwave sintered WC-Co cemented carbide based on the hot spots formation was proposed. (C) 2013 Elsevier Ltd. All rights reserved.
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