【摘要】 利用电热爆炸超高速喷涂技术,在低碳钢基体上原位合成了MoSi2及其合金化涂层。采用扫描电子显微镜、X射线衍射仪、能谱仪、显微硬度计等分析了涂层的微观组织、相组成、元素分布及显微硬度。结果显示,三种涂层均由MoSi2或Mo(Si,Al)2主相组成,其显微组织主要为树枝晶,涂层均匀致密,组织细小。涂层的硬度在1200~1440HV之间。加入Cr和Al元素可使硬度降低,合金化主要改变了涂层的相组成和组织组成。涂层与基体之间有原子扩散,为冶金结合。更多还原

【Abstract】 MoSi₂-based coatings were in-situ synthesized on low carbon steel substrate by electrothermal explosion ultra-high speed spraying methods.The microstructure,phase structure,elements distribution and hardness of the coatings were investigated by SEM,XRD,EDS and hardness test.The results indicate that three kind of coatings are composed of MoSi₂ or Mo（Si,Al）₂ primary phase.The compact and fine microstructure of the coatings with dendrite structure is obtained. The microhardness of the coatings is 1200～1440 HV.The hardness of Mo-Si-Al and Mo-Si-Cr coatings is lower than that of Mo-Si coating appreciably.The microstructure and phase structure of the coatings are changed by alloying.Elements diffusion between coating and substrate occurs at interface,and the bonding of coating-substrate is metallurgical one.更多还原