Spark-Plasma Sintering of Molybdenum Disilicide

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The effect of milling on the densification behavior of MoSi2 powder during spark-plasma sintering (SPS) was investigated. MoSi2 starting powder with an average particle size of 10 µm was milled to reduce particle sizes to less than 1 µm. Sintering was performed in a SPS facility, varying the sintering temperature from 1200°C to 1500°C. Changes in relative density and the densification rate were measured as a function of temperature. Additionally, the microstructure of sintered compacts was analyzed by means of SEM and EPMA. The sintered density was lower for ballmilled powder compacts (having 94-95% relative density) than for as-received ones (having 94- 98% relative density) despite a higher densification rate of the former in the early and middle stages of sintering. These apparently contradictory results can be explained by a pick-up of oxygen (from 0.3 to 1.8 wt. % O) during the milling process, leading to the formation of silicon oxide and its decomposition into a gas phase at temperatures above 1200°C.

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Edited by:

Hai-Doo Kim, Hua-Tay Lin and Michael J. Hoffmann

Pages:

160-165

Citation:

J. S. Kim et al., "Spark-Plasma Sintering of Molybdenum Disilicide ", Key Engineering Materials, Vol. 287, pp. 160-165, 2005

Online since:

June 2005

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$38.00

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