Materials Science Forum, Vol.461-464, 439-446, 2004
Effect of microstructure on the high temperature oxidation and pesting behavior of MoSi2
The control of the microstructure (i.e. grain size, defects, texture...) and the surface state of materials is essential for their use under severe conditions, especially during the initial step of high temperature corrosion process where the formation of a protective oxide layer is effective. Very promising new results have been obtained from nano-structured intermetallics such as MoSi2. They are of great interest because they are able to form silica scales under high temperature oxidant atmospheres. The present work shows that the scales formed on the nano-structured materials exhibit very good protective properties compared to the classical micro-structured materials during high temperature oxidation tests. The most original results are obtained at lower temperature (673 K