Densification and microstructure evolution of W-TiC-Y2O3 during spark plasma sintering |
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| Affiliation: | 1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;2. Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka-fu 590-0494, Japan;3. Laboratory of Nonferrous Metal Material and Processing Engineering of Anhui Province, Hefei 230009, China;4. Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;5. National-Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology, Hefei 230009, China;1. Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 05006, Republic of Korea;2. Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden 80401, USA;3. Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea |
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| Abstract: | Spark plasma sintering (SPS) is one of the methods used to achieve the low-temperature densification of refractory metal materials. In this study, powder prepared through a wet chemical method was consolidated via SPS at 1100 °C, 1200 °C, 1350 °C, 1600 °C, and 1800 °C to obtain a high-performance W-TiC-Y2O3 composite material. Densification was studied by analyzing the densification curve and changes in the microstructure of the samples. This process could be divided into three stages: the bonding stage, the sintering neck growth stage, and the shrinkage and spherification stage of closed pores. Surface diffusion and grain boundary diffusion played different roles in densification. The density, grain size, and Vickers hardness of the tungsten material increased significantly as temperature increased. This study evaluated the sintering process and provided a basis for obtaining high-performance tungsten materials through SPS. |
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