Synthesis of Si3N4-MoSi2 in situ composite from mechanically activated (Mo+ Si3N4) powders

Singh, Sheela ; Godkhindi, M. M. ; Rao, R. V. Krishna ; Murty, B. S. (2004) Synthesis of Si3N4-MoSi2 in situ composite from mechanically activated (Mo+ Si3N4) powders Journal of Alloys and Compounds, 381 (1-2). pp. 254-257. ISSN 0925-8388

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.jallcom.2004.03.097

Abstract

Mo and Si3N4 powder mixtures in the molar ratio of 1:3 were mechanically activated by high-energy ball milling for 0-100 h. No MoSi2 formation was observed during milling. DTA and TGA results showed that the reaction between Mo and Si3N4 enhanced with increase in milling time. The milled powder mixtures were reacted at different temperatures between 1000 and 1400 °C for the synthesis of Si3N4-MoSi2 in situ composite. Complete conversion of Mo in 10-100 h milled sample into MoSi2 has been observed after pyrolysis at 1400 °C for 1 h. In the unmilled (0 h) sample lower silicide of Mo i.e., Mo5Si3 has been detected. In the mechanically activated samples, after 10 h of milling, no Mo5Si3 formed after reaction at 1400 °C for 1 h. The intensities of peaks of MoSi2 in the pyrolysed samples increased with increase in milling time. In the pyrolysed sample both nano- and sub-micron size MoSi2 particles were observed to be uniformly distributed through out the Si3N4 matrix.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Intermetallics; Nanostructure; High-energy Ball Milling; Powder Metallurgy; Thermal Analysis
ID Code:73888
Deposited On:08 Dec 2011 03:49
Last Modified:08 Dec 2011 03:49

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