Oxidation behaviour of particle reinforced MoSi2 composites at temperatures up to 1700°C. Part II: Initial screening of the oxidation behaviour of MoSi2 composites

Abstract

In the first part of this paper a literature survey on the oxidation behaviour of MoSi2 and MoSi2 composites has been given. The present second part reports about the experimental results from oxidation tests with several MoSi2 composites containing 15 vol.-% Al2O3, Y2O3, ZrO2, HfO2, SiC, TiB2, ZrB2, or HfB2, respectively, from different development stages. The tests were conducted at 1600°C in air for 100 hours. It was shown that the production route of the powders has a significant influence on the performance of the materials at high temperatures. This was attributed to contaminations. Additionally, the results indicated that only the composites with SiC, ZrO2 or HfO2, respectively, are suitable for application above 1500°C. A more detailed report about the optimised material will follow in the third part of this paper.