期刊
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
卷 27, 期 6, 页码 1014-1018出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2009.07.017
关键词
WC-Co cermet; Particle-size combination; Spark plasma sintering; Mechanical properties
资金
- National Natural Science Foundation of China [50671001, 50871001]
- Program for New Century Excellent Talents in University [NCET-06-0182]
- Doctorate Foundation of Chinese Education Ministry [20070005010]
- High Technique Program for Advanced Materials from Science and Technology Commission of Beijing [Z08000003220000]
The WC-Co cermet bulks were prepared by spark plasma sintering (SPS) using powder mixtures with different-scaled WC particles. The SPS densification process was studied by calculating the current distribution between the powder sample and the die in the SPS system. The microstructures were characterized and compared for different samples by the WC grain size, Co mean free path and contiguity of WC grains. In spite of a weak effect of WC particle size on the SPS densification stages, the WC particle size plays a significant role in the homogeneity of the cermet microstructure. Good mechanical properties of the SPSed cermet were obtained with an optimized WC and Co particle-size combination. The effects of scale combination of WC and Co particles on the microstructure hence the properties of the SPSed cermet were discussed. (C) 2009 Elsevier Ltd. All rights reserved.
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