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Vol.35, No.8, 987 ~ 996, 1997
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| Title |
| Microstructures and Properties of MoSi2 Compound and MoSi2 / Nb Composite by MA-Spark Plasma Sintering |
| 박용호 , 정해용 , 이성열 , 주영한 , 배차헌 Yong Ho Park , Hae Yong Jeong , Sung Yul Lee , Yeong Han Joo , Cha Hurn Bae |
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| Abstract |
| MoSi₂ is one of the most promising candiate for high-temperature structural materials because of its high melting point and excellent oxidation resistance. However, the low room temperature fracture toughness and ductillity, etc. of MoSi₂ still remains as major obstacles to potential high temperature structural applications. The fracture toughness of brittle matrix ran be improved by the incoporation of a ductile second phase such as metallic Nb. The purpose of this study is to improve the room temperature fracture toughness and ductillity of sintered MoSi₂ and MoSi₂/Nb composites respectively by densification, refining of microstructure and minimizing of interfacial reactions between matrix and Nb. These compound and composite are prepared by mechanical alloying(MA)-spark plasma sintering process(SPS). The microstructures and material properties of these sapmle were investigated by optical microscopy, SEM, XRD, EPMA, microhardness measurement and 4-point bending test. The Vickers hardness, bending strength and fracture toughness increased with the incorporation of metallic Nb. |
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