Abstract
Molybdenum is one of refractory metals and is a good material at high temperatures. However, it is difficult to use over 700K because of its poor resistance to oxidation. Thus, it is inevitable to introduce a protective surface layer with an oxidation-resistant material such as silicides or aluminides of refractory metals when it is used in oxidizable surroundings at high temperature. MoSi 2 is expected to be used as the protection layer since it shows excellent resistance to against oxidation in hot air at temperatures above 2000K. When MoSi 2 is used as the surface layer, cracks would form between the metal matrix and surface layer because of the difference of coefficients of thermal expansion between MoSi 2 (8.56 × 10 -6 /K) and Mo(5.6 × 10 -6 /K) In this paper, the protection layer, which consists of multiple layers with gradient compositional rate, was prepared and tested. A Mo/MoSi 2 material with multiple layers was fabricated by Self-propagating High -temperature Synthesis(SHS). As a result, samples that have good relaxation of thermal stress can be obtained by this method.
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