Abstract
The oxidation of a Mo(Si,Al)2-based composite is investigated in the temperature range 900–1600 °C in dry air. Exposure time was 72 h. Comparisons are made with the oxidation behavior of a conventional MoSi2-based material. Cross-sections are examined with scanning electron microscopy and transmission electron microscopy; the phase composition is analyzed by X-ray diffraction and convergent beam electron diffraction. The material forms a continuous external α-alumina scale throughout the temperature range. Below the scale, there is a continuous Mo5(Si,Al)3 layer that overlies Mo(Si,Al)2 in the bulk. The Mo(Si,Al)2 phase immediately beneath the Mo5(Si,Al)3 layer is depleted in Al. No indications of MoO3 volatilization could be found for the Mo(Si,Al)2 material.
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