Effects of high-energy ball milling and reactive spark plasma sintering on the densification of HfC-SiC composites |
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| Affiliation: | 1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran;2. International Center for Young Researcher (ICYS), National Institute of Material Science (NIMS), Tsukuba, Japan;3. Department of Materials Science and Engineering, Anadolu University, Eskisehir, Turkey;4. Université de Lyon, INSA-Lyon, MATEIS CNRS, Bâtiment Blaise Pascal 7, Villeurbanne Cedex, France |
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| Abstract: | The combined effects of high-energy ball milling (HEBM) and reactive spark plasma sintering (R-SPS) of HfSi2 and C powder mixture on the densification and microstructure of nanostructured HfC-SiC composites were investigated. HEBM significantly promoted the densification and improved the microstructure of the HfC-SiC composites. In contrast, the reactions between HfSi2 and C did not directly promote the densification of the HfC-SiC composites. While the reaction was mostly completed at 1300 °C, the onset temperature of significant densification was 1610 °C. Fine and homogeneously distributed HfC and SiC particles formed by HEBM and R-SPS were the key factors for promoting the densification of the HfC-SiC composites. The fine particles had high surface energy, which provided enough driving force for densification. In addition, the homogeneously distributed SiC particles effectively suppressed the growth of HfC matrix grains during densification. |
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| Keywords: | HfC-SiC composites High-energy ball milling Reactive spark plasma sintering Densification mechanism |
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