【摘要】 在不锈钢基材上通过激光合成Ni-Cr-Al-Co-X(X=Mo、W、Nb、Ti、C)+12%TiC粉末制备出组织均匀且与基体间完全冶金结合的无缺陷的涂层,其中组织主要为金属间化合物Ni3Al-Ni0.58Al0.42及其增强相TiC。利用金相显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、显微硬度计和磨损试验机对涂层的组织、相结构、硬度及耐磨性进行了分析和测试。结果显示:复合材料涂层的主要组织为TiC增强相、金属间化合物Ni3Al及大量Ni0.58Al0.42相;其组织均匀,与基体之间为完全冶金结合,具有硬度高、抗粘着摩损能力强的特点,在滑动干摩擦实验条件下表现出优异的耐磨性。更多还原

【Abstract】 A novel rapidly solidified Ni3Al-Ni0.58Al0.42 composite coating is fabricated on the substrate of 1Cr18-Ni9Ti carbon steel by laser cladding using Ni-Cr-Al-Co-X(X=Mo、W、Nb、Ti、C)+12%TiC power blends. Microstructure of the intermetallic composite coating is examined by OM,SEM and XRD. Wear resistance of the coating is tested under dry sliding wear condition at the room temperature.The results show that the laser cladding intermetallic composite coating has a rapid solidified homogeneous microstructure consisting of primary particles uniformly distributed in the Ni3Al-Ni0.58Al0.42 eutectic matrix and is metallurgically bonded to the substrate. The laser cladding composite coating has high hardness and fine wear-resistance under dry sliding wear test conditions.更多还原