MA-プラズマ法により作製したMoSi_2化合物およびMoSi_2/Nb複合焼結体の組織と性質 [in Japanese] Microstructures and Material Properties of MoSi_2 Compound and MoSi_2/Nb Compostite Materials Made by MA-Spark Plasma Sintering [in Japanese]
Access this Article
Search this Article
MoSi<SUB>2</SUB> is one of the-most promising candidate for high-temperature structural materials because of its high melting points and excellent oxidation resistance. However, the low room temperature fracture toughness and ductility, etc. of MoSi<SUB>2</SUB> still remains as major obstacles to potential high temperature structural applications. The fracture toughness of brittle matrix can be improved by the incorporation of a ductile second phase such as metallic Nb. The purpose of this study is to improve the room temperature fracture toughness and ductility of sintered MoSi<SUB>2</SUB> and MoSi<SUB>2</SUB>/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(SPS) process. The microstructures and material properties of these samples 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.
- J. Jpn. Soc. Powder Powder Metallurgy
J. Jpn. Soc. Powder Powder Metallurgy 44(1), 79-85, 1997-01-15
Japan Society of Powder and Powder Metallurgy