Low-temperature oxidation behavior of MoSi2 powders
来源期刊：International Journal of Minerals Metallurgy and Materials2007年第6期
论文作者：Islam S. Humail
文章页码：558 - 561
摘 要：The oxidation behavior of molybdenum disilicide （MoSi2） powders at 400, 500, and 600oC for 12 h in air were investi- gated by using X-ray diffraction （XRD） and transmission electron microscopic （TEM） techniques. Significant changes were observed in volume, mass, and color. Especially at 500oC, the volume expansion was found to be as high as 7-8 times, the color changed from black to yellow-white, and the mass gain was about 169.34% after 8 h, with SiO2 and MoO3 as main reaction products. The gains in volume and mass were less at 400 and 600oC compared with those at 500oC, probably due to the less reaction rate at 400oC and the formation of silica glass scale at 600oC, which would protect the matrix and restrain the diffusion of oxygen and molybdenum. Thus, the accelerated oxidation behavior of MoSi2 powder appeared at 500oC and the volume expansion was the sign of accelerated oxida- tion.
Islam S. Humail
State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China
摘 要：The oxidation behavior of molybdenum disilicide （MoSi2） powders at 400, 500, and 600oC for 12 h in air were investi- gated by using X-ray diffraction （XRD） and transmission electron microscopic （TEM） techniques. Significant changes were observed in volume, mass, and color. Especially at 500oC, the volume expansion was found to be as high as 7-8 times, the color changed from black to yellow-white, and the mass gain was about 169.34% after 8 h, with SiO2 and MoO3 as main reaction products. The gains in volume and mass were less at 400 and 600oC compared with those at 500oC, probably due to the less reaction rate at 400oC and the formation of silica glass scale at 600oC, which would protect the matrix and restrain the diffusion of oxygen and molybdenum. Thus, the accelerated oxidation behavior of MoSi2 powder appeared at 500oC and the volume expansion was the sign of accelerated oxida- tion.
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