通过机械合金化球磨方式制备TiB2硬质相和Co粘结相质量比为3:1的TiB2-25Nj金属陶瓷复合粉末,采用超音速火焰喷涂技术在Q235钢基体表面制备了3种不同氧气流量的TiB2-25Ni涂层,通过扫描电子显微镜、X射线衍射表征涂层的微观组织形貌和物相结构,采用显微硬度计测量涂层硬度值,并对涂层的抗热震性能、耐熔融铝硅腐蚀性能和耐磨粒磨损性能进行研究.结果表明,3种涂层组织致密,呈典型的层状结构;涂层的主要物相均为TiB2和Ni;3种涂层的显微硬度值分别为(408 ±87)HV0.3、(513±90) HV0.3和(553±77) HV0.3;经过热震试验发现,氧气流量为462 L/min的试样具有最佳的抗热震性能;经过60 h熔融铝硅腐蚀试验发现,3种涂层试样均具有良好的耐腐蚀性,其中以氧气流量为462 L/min的试样最佳.在磨粒磨损试验中发现,氧气流量为462L/min的涂层试样的耐磨性比基体提高近6倍.
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