パルス通電加圧-燃焼合成法によるMo-Si系金属間化合物の作製 Fabrication of Mo-Si System Intermetallic Compounds by Pulse Discharge Pressure-Combustion Synthesis
In this study, Mo-Si and Mo-Si-Nb system were fabricated by the pulse discharge pressure-combustion synthesis method (Nb was added into Mo-Si, in order to improve ductility at room temperature and high temperature strength). During the synthesis of Mo-Si and Mo-Si-Nb mixed powders, samples abruptly shrunk at 1323K. It is clear that combustion reaction occurred at this temperature and compounds were formed by combustion reaction. The relative density of fabricated samples was 96 to 98% and no internal defects were foundby ultrasound images in the samples. The formed phases of the fabricated samples were as follows;only MoSi<SUB>2</SUB> phases were formed for Mo:Si=1:2 mixed powders, and, for the Nb added samples, MoSi<SUB>2</SUB>, Nb<SUB>5</SUB>Si<SUB>3</SUB> and Mo<SUB>5</SUB>Si<SUB>3</SUB> phases were formed and unreacted Nb remained. Young's modulus and the bending strength of fabricated samples showed similar results. Monolithic MoSi<SUB>2</SUB> sample had the highest value of Young's modulus and bending strength, and for Nb added samples, Young's modulus and bending strength decreased with the increase in Nb content.
粉体および粉末冶金 44(6), 530-534, 1997-06-15
Japan Society of Powder and Powder Metallurgy