Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 488, Issue 1-2, Pages 1-7Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.01.048
Keywords
spark plasma sintering; WC-Co cermets temperature distribution; neck formation
Categories
Funding
- National Natural Science Foundation of China [50401001, 50671001]
- Beijing New Star of Science and Technology [2004B04]
- New Century Excellent Talents in University [NCET 2006]
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Based on the experimental investigations, a model that describes the distributions of the current intensity and the temperature increase among the different raw powder particles, as well as its evolution during the spark plasma sintering (SPS) process, has been developed. As calculated by the model, in a WC-Co combined (Co-film coated WC) particle, a majority fraction of the WC particle is heated by the thermal energy transferred from the Co film. The rapid melting and joint of the Co films lead to the fast formation of the sintering necks of the combined particles. The temperature of the combined particles may reach the eutectic temperature of WC and Co and the melting temperature of Co at relatively lower sintering temperatures, thus the powder particles can be densified rapidly at the temperatures apparently lower than those in the conventional sintering techniques. The physical essence of the neck formation and the unique densification feature of the SPS process is presented by combing theoretical analysis and experimental studies. (C) 2008 Elsevier B.V. All rights reserved.
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