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)+TiC粉末,制备出金属间化合物Ni3Al-Ni0.58Al0.42,获得了组织均匀且与基体间完全冶金结合的无缺陷涂层。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。结果表明,复合材料涂层主要组织为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;复合材料涂层具有硬度高、抗黏着摩损能力强的优点,在滑动干摩擦试验条件下表现出优异的耐磨性能。
A novel rapidly solidified TiC/Ni-AI composite coating was fabricated on the substrate of 1Cr18Ni9Ti steel by laser cladding using Ni-Cr-Al-Co-Mo-W-Nb - Ti - C + TiC power blends. Microstructure of the intermetallic composite coating was examined by OM, SEM and XRD. Wear resistance of the coating was tested under dry sliding wear condition at room temperature. The results showed that the laser clad intermetallic composite coating had a rapid solidified homogeneous microstructure consisting of primary particles uniformly distributed in the Ni3 Al- Ni0.58Alg0.42 eutectic matrix and was metal-lurgically bonded to the substrate. The laser clad composite coating had high hardness and good wear-resistance under dry sliding wear test conditions.
出处
《材料保护》
CAS
CSCD
北大核心
2007年第10期5-8,共4页
Materials Protection
关键词
激光合成
复合材料涂层
显微组织
耐磨性
laser cladding
composite coating
microstructure
wear resistance
