MoB/CoCr金属陶瓷涂层的制备、组织结构及性能研究

利用低压等离子喷涂(LPPS)制备了MoB/CoCr金属陶瓷涂层.通过X射线衍射(XRD)分析物相组成、扫描电镜(SEM)、能谱(EDAX)对涂层的微观组织和成分进行分析,并对涂层的结合强度和抗热震性能进行研究.研究结果表明:粉末与喷涂后涂层物相差异不大,涂层为层状结构,随压力越高,粉末熔化越充分;涂层与基体结合良好,涂层致密;涂层喷涂后主要成分保持不变,且具有良好的结合强度和抗热震性能,经过1080 h熔融Al-12.07;Si腐蚀后,涂层完好,具有很好的抗腐蚀性能.

Research on Preparation, Microstructure and Performance of MoB/CoCr Cermet Coatings

MoB/CoCr cermet coatings were deposited by low pressure plasma spraying (LPPS).The microstructure and phase component of coatings were characterized by XRD, SEM and EDAX, the coatings were also studied on bond strength and thermal shock resistance performance. The results show that phase component of powder and coating had little change, chamber pressure influenced the melting of powder dramatically during LPPS, and the ratio of fully-melted zone/partly-melted zone increased as chamber pressure increasing. The coatings are dense and have excellent combination with substrate. The main constituents of coatings remain invariant and the coatings have excellent performance of bond strength and thermal shock resistance. And the MoB/CoCr coating has much higer durability in the molten Al-12.07wt%Si after 1080 h immersion test.