molybdenum disilicide intermetallic(MoSi 2 ) compounds due to properties such as high melting point, resistance to corrosion at high temperatures, low production cost, non-toxicity and thermodynamic stability and the ability to form different composites of metal and ceramics is on attention. Because of the above properties molybdenum silicide is used in various industries. The aim of this study was to investigate the kinetics of oxidation of molybdenum silicide intermetallic compounds in the presence of aluminum and zirconium. Hence with appropriate stoichiometric ratio of silicon and molybdenum powders with 0, 5 and 10 wt% of aluminum and zirconium powder were prepared separately and then synthesized in an air atmosphere under combustion synthesis and spark plasma sintering processes. In order to continue Phase, chemical composition and structures created, tests of samples by X-ray diffraction (XRD) and X-ray energy spectroscopy (EDS) and the scanning electron microscopy and optical microscopy were prepared. After this, the mechanism and kinetics of oxidation tests were determined by TG, DTA and DSC on powder before synthesis and synthesized samples. The results showed that with increasing aluminum front combustion speed decreases and the hexagonal phase is higher than 10 wt% Mo (Si, Al) 2 is developed. On the other hand, by increasing the amount of zirconium, heat of formation of ZrO 2 , Zrsi 2 and dissolution of zirconium in the structure of molybdenum disilicide thus speeding up the progressive wave of spontaneous combustion occurs. The presence of aluminum and zirconium does simultaneously improves the effectiveness of each other. For explosively synthesized specimens, the ignition temperature decreases with increasing the zirconium content so that this temperature with Finally, oxidation tests were performed on specimens of synthesized by SHS and process under air atmosphere. A higher intermediate temperature oxidation resistance was obtained for specimens containing aluminum and zirconium compared to that of free ones. Therefore, obtained results reveal that addition of aluminum and zirconium not only results in reduction of ignition temperatures and increase in the velocity of the combustion wave, but also improves the intermediate temperature oxidation So is the impact of aluminum on the field more. 5 wt% aluminum and 5% by weight of zirconium made using spark plasma sintering are the highest resistance to oxidation. Intermediate temperature oxidation; however. Keywords : Oxidation, kinetic, Molybdenum disilicide, Aluminum, Zirconium, oxidation resistance, Composites.
