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Manufacturing and Oxidation Behavior of Silicide-Based Nanocomposite Coatings on Refractory Metals by Displacement Reaction

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Abstract:

The microstructure and oxidation resistance of MSi2-SiC or MSi2-Si3N4 nanocomposite coatings (M = Mo, W, Nb, Ta) on M substrates formed by displacement reactions between M-carbides or M–nitrides and silicon, respectively, was investigated. Present study demonstrated that the crack density formed in the MSi2-base nanocomposite coatings due to mismatch in the coefficient of thermal expansion between nanocomposite coatings and M substrates could be controlled by adjusting the volume fraction of the SiC or Si3N4 reinforcing particles with the low CTE values. The high- and low-temperature oxidation resistance of nanocomposite coatings was superior to that of monolithic MSi2 coatings.

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Periodical:

Materials Science Forum (Volumes 539-543)

Pages:

135-140

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.539-543.135

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Online since:

March 2007

Authors:

Jin Kook Yoon, Dong Wha Kum, Kyung Tae Hong

Keywords:

Displacement Reaction, MSi2-Base Nanocomposite Coating, Oxidation Behavior

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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