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Characterization of cemented carbides prepared by hot pressing and spark plasma sintering

LIU Xue-mei~1,SONG Xiao-yan~1,LIU Wen-bin~1,ZHAO Shi-xian~1,ZHANG Jiu-xing~1,YIN Fu-xing~2(1. College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, China Ministry of Education, Beijing University of Technology, Beijing 100124,China;2. National Institute for Materials Science,1-2-1Sengen, Tsukuba, Ibaraki, 305-0047, Japan)  
The phase constitution, microstructure and properties of the cemented carbides prepared by hot pressing and spark plasma sintering techniques were characterized and compared. The high density and the pure phase constitution were obtained by both the sintering methods. The misorientation distribution function (MDF) shows a preferred misorientation relationship of WC-WC grain boundaries as 90° with respect to the [10 1 0] direction. These grain boundaries are the low-energy boundaries in the material. The two samples have nearly the same hardness. The grain size in the SPSed sample is smaller than that in the hot-pressed sample, which shows the advantages of SPS technique in rapid heating rate and short holding time and thus inhibits grain coarsening during the sintering process, especially the grain growth at high temperatures.
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