Sintering Mechanism and Microstructure of TaC/SiC Composites Consolidated by plasma-activated sintering |
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| Affiliation: | 1. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China;2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6064, USA;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, China;2. School of Metallurgy and Materials, University of Birmingham, Birmingham, UK;3. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, China |
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| Abstract: | TaC/SiC composites with 5 wt% SiC addition were densified by plasma-activated sintering (PAS) at 1500–1800 °C for 5 min under 30 MPa. The effects of plasma-activated sintering on microstructures, densification and mechanical properties of the composites were investigated. The results showed that TaC/SiC composites achieved a relative density more than 99% of the theoretical density at 1600 °C. A low eutectic liquid phase generated by the oxide on the particle surface was observed in the composite to realize a relatively low temperature sintering densification. While the TaC particle size decreased insignificantly with increasing sintering temperature, the transformation of morphology of SiC particles changing from equiaxed to elongated grain was activated, accompanying with a slight particle size decreasing of the SiC phase, thus promoting a relatively high flexural strength of 550 MPa under 1800 °C. Besides, some ultra-fine 2 nm Ta2Si was observed in the glassy pockets, strengthening the amorphous phase and thus increasing the flexural strength. |
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| Keywords: | TaC matrix SiC additive Surface oxide PAS sintering Sintering mechanism Low eutectic glassy phase |
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