不同喷涂工艺下NiCoCrAlYTa涂层的显微结构和性能  

Microstructure and Property of NiCoCrAlYTa Coatings Prepared by Different Thermal Spraying Technology

作　　者：毛杰 邓春明 吴相彬 邓畅光 宋进兵 刘敏 MAO Jie DENG Chunming WU Xiangbin DENG Changguang SONG Jinbing LIU Min(The Key Lab of Guangdong for Modern Surface Engineering Technology, National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510651)

机构地区：[1]广东省新材料研究所,现代材料表面工程技术国家工程实验室,广东省现代表面工程技术重点实验室,广州510651

出　　处：《材料导报》2017年第16期51-54,共4页Materials Reports

基　　金：广东省对外合作项目(2013B050800027);广州市对外合作项目(201508030001);广东省引进创新科研团队计划(2011C007)

摘　　要：为探索不同喷涂工艺对NiCoCrAlYTa涂层的显微结构和性能的影响规律,确定最优工艺,采用大气等离子、低压等离子、常规超音速火焰和低温超音速火焰4种工艺在镍基单晶高温合金表面制备了NiCoCrAlYTa涂层。采用X射线衍射(XRD)、扫描电镜(SEM)和显微硬度计等分析手段对喷涂态涂层的相组成、显微结构和显微硬度等进行了表征。结果表明,不同喷涂工艺下涂层的相组成均为γ′-Ni_3Al、β-NiAl和γ-Ni固溶体。低压等离子和超音速火焰喷涂的涂层致密且孔隙率低,其中超音速火焰喷涂的涂层孔隙率低于1%。低压等离子和低温超音速火焰喷涂的涂层氧含量很低,控制在0.3%~0.6%的范围。综合来说,低温超音速火焰喷涂工艺制备的涂层结构致密,孔隙率和氧含量很低。该工艺是沉积NiCoCrAlYTa涂层的首选。To explore the influence of different thermal spraying processes on the microstructure and properties of NiCoCrAlYTa coatings and determine the optimal parameters,the NiCoCrAlYTa coatings were obtained on the single crystal superalloy substrate by air-plasma spraying（APS）,low-pressure plasma spraying（LPPS）,high velocity oxygen-fuel spraying（HVOF）and low temperature high velocity oxygen fuel（LT-HVOF）methods.The phase compositions,microstructure and micro-hardness of all coatings were characterized by XRD,SEM and micro-hardness tester.The same phase composition ofγ′-Ni3Al,β-NiAl andγ-Ni solid solution were proved in NiCoCrAlYTa coatings under different spraying methods.The coatings prepared by LPPS,HVOF（LTHVOF inclued）are dense and of low porosity,among which the porosity of HVOF（LT-HVOF included）coating is less than 1% .Oxygen content is low in LPPS and LT-HVOF coatings,and which is controlled in the range of 0.3% to 0.6% .Generally,LTHVOF process is the optimum choice for depositing NiCoCrAlYTa coating with dense structure,very low porosity and oxygen content.

关 键 词：热喷涂技术 NICOCRALYTA涂层 显微结构 显微硬度 

分 类 号：TG174.453[金属学及工艺—金属表面处理]