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分别以2.5~15μm、15~30μm、30~54μm和54~74μm四种粒径的二硅化钼为热喷涂粉末,利用大气等离子喷涂技术制备了二硅化钼涂层,通过XRD和带能谱的SEM表征了涂层的微观组织结构.结果表明,喷涂过程中,喷涂粉末中部分四方相MoSi2 (t)转变为六方相MoSi2 (h),MoSi2中的Si含量出现了损失.随着喷涂粉末粒径的增大,MoSi2粒子在沉积过程中的氧化程度减弱,涂层中的Mo、Mo5Si3等富钼相和MoO3、MoO2等氧化产物的相对含量逐渐减少,而富硅相MoSi2逐渐增加.粉末粒度分别在30~54μm和54~74μm范围时,均可获得以MoSi2为主相的涂层.以粒径30~54μm的粉末制备的涂层组织较致密,内部出现了富钼相“网状”结构的组织.

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