In Situ Synthesis of MoSi<sub>2</sub>-SiC Composites by Two-Step Spark Plasma Sintering
The effect of different SiC doping content on the properties of MoSi<sub>2</sub>-based composites was analyzed in this study. The MoSi<sub>2</sub>-SiC composites were fabricated in situ by the SPS technique, utilizing self-synthesized carbon-containing Mo powder and Si powder...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/2/144 |
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| Summary: | The effect of different SiC doping content on the properties of MoSi<sub>2</sub>-based composites was analyzed in this study. The MoSi<sub>2</sub>-SiC composites were fabricated in situ by the SPS technique, utilizing self-synthesized carbon-containing Mo powder and Si powder as raw materials. A two-step sintering process was employed to ensure the formation of a uniform and dense composite structure. The microstructures and mechanical properties of these composites with various compositions were characterized. The results show that the composites were primarily composed of MoSi<sub>2</sub>, SiC, and a minor proportion of MoSiC phase. The introduction of SiC as a second phase was found to considerably enhance the mechanical properties of the MoSi<sub>2</sub> matrix material. In particular, the MoSi<sub>2</sub>-26mol.%SiC sample exhibited Vickers hardness, fracture toughness, and flexural strength values of 16.1 GPa, 6.7 MPa·m<sup>1/2</sup>, and 496 MPa, respectively, corresponding to increases of 33%, 24%, and 28% compared to the pure MoSi<sub>2</sub> material. |
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| ISSN: | 2075-4701 |