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采用等离子熔覆在R780材质钻杆上堆焊3种不同螺旋熔覆层,并利用金相显微镜、扫描电镜(SEM)、X射线衍射仪(XRD)、洛氏硬度计和磨料磨损试验机等分析测试手段研究了不同熔覆层的组织与性能。结果表明:熔覆层中添加少量稀土元素即可使其晶粒细化,添加Al2O3-TiO2复合陶瓷粉末,可在熔覆层中形成弥散分布的Al2O3硬质强化相。添加稀土元素和Al2O3-TiO2后的熔覆层的硬度和耐磨性有明显的提高。
Three kinds of helical cladding coatings were deposited on R780 rods by plasma cladding. The microstructure and mechanical properties of the rods were studied by metallographic microscope, scanning electron microscope (SEM), X-ray diffraction (XRD), Rockwell hardness tester and abrasive wear tester Analytical and testing methods were used to study the microstructure and properties of different coatings. The results show that the addition of a small amount of rare earth elements in the cladding layer can make its grain refinement. Adding Al2O3-TiO2 composite ceramic powder can form dispersed Al2O3 hard strengthening phase in the cladding layer. The addition of rare earth elements and Al2O3-TiO2 coating after the hardness and wear resistance significantly improved.