【摘要】 采用 5kWCO2 激光器在IF钢表面激光熔覆Co Cr W Ni Si合金 /SiCp 陶瓷涂层。利用光学显微镜、扫描电镜、X射线衍射仪分析了熔覆层的相结构和凝固组织特征。对熔覆层的耐磨性进行了试验。结果表明 ,熔覆层细小均匀 ,与基体搭接处为平面、胞状晶 ,表层为细密的枝晶。熔覆层的相结构为γ Co及Si2 W ,CoWSi,Cr3 Si,CoSi2 等相。SiC的加入提高了熔覆层的耐磨性更多还原

【Abstract】 Coatings,made of Co Cr W Ni Si alloy+20% Si C p,deposited by laser cladding on IF steel are introduced. Cross section of s uch coatings has been examined to reveal their microstructure using optical moic roscope,scanning electron and XRD. There existed some crystallization morpholog ies in different regions,such as planar,cellar (at the bonding area),columnar and dendrite (at the center and near the surface). XRD showed that the primary phase γ Co dendrite and Si 2W,CoWSi,Cr 3Si,CoSi 2 existed in the coatin gs. The results also showed that the wear resistance of the clad layer improve d by adding SiC p.更多还原