激光熔覆纳米Sm_2O_3/Co基涂层的硬度及耐磨性  

Hardness and Wear-resistance of Laser Cladding Nano-Sm_2O_3/Co-based Alloy Coating

作　　者：丁林[1] 蒋红云[1] 李明喜[2] 

机构地区：[1]安徽国防科技职业学院机械工程系 [2]安徽工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2013年第9期805-808,共4页Special Casting & Nonferrous Alloys

基　　金：安徽省高校省级自然科学基金资助项目(KJ2012B031)

摘　　要：采用横流CO2激光器在低碳钢表面制备了纳米Sm2O3/Co基合金熔覆层,利用光学显微镜、X射线衍射仪、显微硬度计和MM 200型环-块滑动磨损机,比较分析了激光熔覆层的相组成、微观组织,并测试其硬度及磨损性能。结果表明,熔覆层的主要相为γ-Co和Cr23C6,并观察到了Fe7Sm和ε-Co;结合界面处存在一条"白亮带",说明基体与涂层粉末获得良好的冶金结合。纳米Sm2O3/Co基合金熔覆层的枝晶组织细小均匀,枝晶的方向性减弱,且纳米Sm2O3含量越多,越明显。纳米Sm2O3的加入,使涂层的显微硬度及耐磨性均有所提高,纳米Sm2O3含量为1.0%的熔覆层的硬度和耐磨性最好。Nano-Sm2O3/Co-based composite coating was prepared on low carbon steel surface by transverse flow CO2 laser. The microstructure, phase compositions, micro-hardness, and wear resistance of the laser cladding layers were analyzed and tested by optical microscope, X-ray diffractometer, microhardness equipment and MM 200 circle-mass friction and wear testing ring. The results show that the cladding coating is composed of γ-Co, Cr23C6, Fe7Sm and ε-Co. A ＂bright band＂ can be observed on the bonding position, showing good metallurgical bonding between coating and alloy powder. Uniform and fine dendrite can be observed in cladding layer of the nano-Sm2O3/Co based alloy coating with the fading of the orientation of dendrite, meanwhile, with the increase of nano-Sm2O3 content, the microstructure is more and more homogeneous. With Sm2O3 addition, the micro-hardness and wear resistance of coatings are improved, and when nano-Sm2O3 is 1.0%, the micro-hardness and wear resistance of coatings exhibit desirable.

关 键 词：激光熔覆 SM2O3 CO基合金 硬度 耐磨性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]