Abstract
Abstract The effects of pore and H 2 O vapor on accelerated oxidation and pesting were observed from fully dense and porous molybdenum disilicide (MoSi 2 ) at 500°C in air and air–H 2 O vapor atmospheres. Occurrence of simultaneous oxidation of Mo and Si, resulting in pesting, was hindered by using fully dense MoSi 2 . In addition, H 2 O vapor has no influence on the oxidation behavior of fully dense MoSi 2 . On the other hand, porous MoSi 2 showed the accelerated oxidation behavior after an induction period. In the induction period, simultaneous oxidation occurred preferentially at pores and gradually spreaded over the surface. After this period, the mass gain increased linearly with a high rate due to generation and development of cracks, resulting in pesting. In porous MoSi 2 , H 2 O vapor in air accelerated the occurrence of pesting. This is probably due to the formations of metastable hydrates, H 2 Si 3 O 7 and H 4 Si 8 O 18 , at pores.
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