以粒度为1~2μm的MoSi2粉末为原料,采用喷雾干燥和真空烧结制备了喷涂用MoSi2团聚粉末. 分别用平均粒度为9.68μm的MoSi2粉末和团聚造粒MoSi2粉末(38~72μm)为喂料, 大气等离子喷涂制备了二硅化钼涂层,分析了涂层的微观组织结构. 研究结果表明,喷雾干燥造粒后的近球形粉末在1300℃真空烧结1h后,粉末流动性和松装密度分别为17.1s/50g和2.16g/cm3,比烧结前分别增加了57.0%和46.0%.平均粒度为9.68μm 的MoSi2粉末制备的涂层主要是由Mo和Mo5Si3等富钼相组成. 团聚粉末制备的涂层主要由MoSi2相组成,涂层较致密, 内部出现了类似“网状”的组织结构.
With the size of 1-2μm MoSi2powder as raw material, MoSi2 powderideal for air plasma spraying was prepared by spray drying and vacuumsintering. By using MoSi2 powders (9.68μm ) and agglomeration powders (38-72μm) as the spray feedstock, MoSi2 coatings weresuccessfully prepared using air plasma spraying. The phase composition and microstructure of the coatingwere studied.The results show that the mobility and loosedensity of theagglomeration powders sintered at 1300℃ for 1h are 17.1s/50g and 2.1g/cm3, respectively. Compared with the unsintered powders, the mobility and loose density of the sintered agglomeration powders increaseby 57.0% and 46%, respectively. XRD patterns shows the main phasesare Mo and Mo5Si3 phases in the coating prepared by thepowders with the size of 9.68 μm.In case of spraying withagglomeration powders, the main phase of the dense coating is MoSi2. The “mesh”microstructure of molybdenum-rich phase is produced in the coatingprepared by the agglomeration powders.
参考文献
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