考察了二硅化钼电热材料在CO和N_2混合气氛条件下使用破坏机理。结果表明,在这种非氧化气份条件下,二硅化钼材料表面很难生成氧化物保护膜;二硅化钼材料表面发生脱硅反应,生成低硅化物,甚至MoC,在表面形成变质层。在频繁的升降温过程中,由于表面变质层与基体的热膨胀系数不同,发生剥落。从而导致二硅化钼材料在这种特出气氛条件下使用寿命的降低。 The destruction mechanism of the molybdenum disilicide heating material under the mixed atmosphere of CO and N 2 was investigated. The results show that it is very difficult to form oxide protective film on the surface of molybdenum disilicide under the condition of non-oxidizing gas. The surface of molybdenum disilicide material undergoes desilication reaction to form low silicide and even MoC to form metamorphic layer on the surface. In the process of frequent heating and cooling, due to the thermal expansion coefficient of the surface of the metamorphic layer and the substrate, the occurrence of spalling. Resulting in a reduction in service life of the molybdenum disilicide material under such exceptional atmosphere conditions.