Abstract
The microstructures and oxidation behavior of Mo(Si,Al) 2-base composites were investigated. A high Al content up to 38 mol% and the effect of the secondary Mo 5(Si,Al) 3 phase were specifically examined. Microstructure observations indicated that the Al solubility limit at 1680 K extends to 43 and 10 mol% for Mo(Si,Al) 2 and Mo 5(Si,Al) 3, respectively. The composites containing about 10 vol.% Mo 5(Si,Al) 3 exhibits excellent oxidation resistance in the temperature range between 780 and 1780 K, so that the Mo 5(Si,Al) 3 up to about 10 vol.% is acceptable and has no detrimental influence on the oxidation resistance. At temperatures from 1480 to 1780 K, a continuous alumina layer develops on the Mo 5(Si,Al) 3 as well as on the Mo(Si,Al) 2. The alumina growth rate is nondistinctive in the Al range investigated, and it is controlled by inward oxygen diffusion through the alumina at 1580 K and higher.
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