利用金属氧化理论 ,从热力学角度分析了MoSi2 低温长时间氧化后 ,表面氧化层中不同相存在的可能性和优先性 ,并讨论了挥发性MoO3相生成的条件 结果表明 :4种氧化反应均能在空气中自发进行 ;从反应进行的难易次序说明了实验中MoSi2 材料低温氧化时生成的Mo8O2 3相衍射峰强较大 ,而Mo5 Si3相峰强较小、且未出现MoO3相的原因 ;指出了Mo8O2 3转化为挥发性MoO3相的氧压条件 ,从而为避免“PEST”现象提供理论依据 图 1 ,表 3,参 1 1 Based on the theory of metal oxidation, the possibility and priority of different phases in the surface oxide layer after the low temperature oxidation of MoSi2 for a long time are analyzed from the thermodynamic point of view. The conditions for the formation of volatile MoO3 phase are also discussed. The results show that all four oxidation reactions Spontaneous in the air. The reaction order of MoSi2 shows that the diffraction peak intensity of Mo8O2 3 phase generated during the low temperature oxidation is relatively large, while the peak of Mo5Si3 phase is small and the reason of MoO3 phase is not observed. Pointed out the oxygen pressure conditions of Mo8O2 3 into volatile MoO3 phase, in order to provide a theoretical basis to avoid “PEST” phenomenon Figure 1, Table 3, reference 1 1