热喷涂用NiCrCoAlY-MoSi2纳米复合粉体制备与表征  

Preparation and Characterization of NiCrCoAlY-MoSi2 Nanostructured Composite Powders for Thermal Spraying

作　　者：吴姚莎[1] 陈伟文 刘名涛 WU Yaosha;CHEN Weiwen;LIU Mingtao(Institute of Intelligent Equipment Manufacturing,Zhongshan Torch Polytecnic,Zhongshan 528436,China;School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]中山火炬职业技术学院装备智造学院,广东中山528436 [2]华南理工大学材料科学与工程学院,广州510640

出　　处：《有色金属工程》2021年第2期48-54,共7页Nonferrous Metals Engineering

基　　金：广东省普通高校青年创新人才类项目(2018GkQNCX058,2020KTSCX327)。

摘　　要：以MoSi2粉和NiCrCoAlY粉为原料,氩气做保护气,采用高能球磨技术成功制备了NiCrCoAlY-MoSi2纳米金属陶瓷复合粉体。利用X射线衍射仪(XRD)、激光粒度分析仪、扫描电子显微镜(SEM)、振实密度仪和松装密度仪等对粉体的微观组织、晶粒尺寸和性能进行了表征和分析。结果表明:NiCrCoAlY-MoSi2粉体高能球磨30 h,纳米级强化相MoSi2均匀弥散分布在粘结相NiCrCoAlY上,平均晶粒尺寸为25 nm。该粉体由大量椭圆形颗粒和少量细小团聚颗粒组成,流动性能明显改善,可稍加过筛后直接用于热喷涂。NiCrCoAlY-MoSi2 nanostructured composite powders were synthesized by high energy ball milling with NiCrCoAlY and MoSi2 in an argon atmosphere.The microstructure,grain size and properties of the nanocomposite powders were characterized and analyzed by X-ray diffraction(XRD),laser scattering,SEM,tap-density tester and apparent density tester.The results show that the average grain size of NiCrCoAlY-MoSi2 powders after 30 h milled is 25 nm,and the hard phase nano-MoSi2 is distributed uniformly on the NiCrCoAlY phase.Moreover,the milled powders have excellent fluidity within large number of ellipsoidal particles,which can be directly thermal spraying after sieving.

关 键 词：MOSI2 高能球磨 纳米晶粒 热喷涂 金属陶瓷 

分 类 号：TG142[金属学及工艺—金属材料]