Transient stage oxidation behavior of Mo76Si14B10 alloy at 1150°C

Abstract: The transient stage during isothermal oxidation of Mo76Si14B10 has been studied at 1150°C. The maximum mass loss is found to occur by volatilization of MoO3 within the first 480s of exposure, which is considered to be the transient period. Scanning electron microscopic studies have revealed that a glassy borosilicate layer flows to cover the top surface, and thereby it acts as a protective coating. The thickness of the borosilicate layer increases with exposure time following a parabolic relationship. The mechanism of oxidation during transient period has been discussed with the help of an analytical model. [Copyright &y& Elsevier]