金属Ni修饰的石墨烯及其对等离子喷涂NiCoCrAlY涂层力学性能的影响  

Metal Ni Modification of Graphene and Its Effect on Mechanical Properties of Plasma Sprayed NiCoCrAlY Coating

作　　者：张宇慧 李大燕 袁晨风 金国 房永超 张丹 ZHANG Yuhui;LI Dayan;YUAN Chenfeng;JIN Guo;FANG Yongchao;ZHANG Dan(AECC Harbin Dongan Engine Co.,Ltd,Harbin 150066,China;Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education,College Material Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]中国航发哈尔滨东安发动机有限公司,哈尔滨150066 [2]哈尔滨工程大学材料科学与化学工程学院,超轻材料与表面技术教育部重点实验室,哈尔滨150001

出　　处：《材料导报》2021年第10期10141-10146,10157,共7页Materials Reports

基　　金：国家自然科学基金(51975137)。

摘　　要：为了解决石墨烯(GNPs)易团聚、高温易烧损等问题,本研究将利用化学镀工艺对石墨烯进行表面金属Ni修饰(Ni@GNPs),并通过等离子喷涂技术在K465高温合金表面制备NiCoCrAlY、NiCoCrAlY+GNPs和NiCoCrAlY+Ni@GNPs三种涂层,重点探究超声辅助、化学镀反应温度以及反应时间等因素对石墨烯表面修饰的影响,研究了Ni@GNPs外来添加相对等离子喷涂NiCoCrAlY涂层组织结构与力学性能的影响。结果表明,经过化学镀处理,石墨烯表面沉积了均匀分布的金属Ni镀层,在50℃下辅助超声反应40 min可进一步提高石墨烯表面的修饰效果;与NiCoCrAlY和NiCoCrAlY+GNPs涂层相比,添加Ni@GNPs能够显著减少涂层的孔洞与裂纹数量、提高涂层的致密性、大幅降低涂层的孔隙率;与NiCoCrAlY相比,NiCoCrAlY+Ni@GNPs涂层的硬度提升了30.9%,冲蚀率下降了7.4%,说明添加相Ni@GNPs能提高NiCoCrAlY涂层的力学性能与抗冲蚀性能。In order to solve the problems of easy agglomerate and oxidation at high temperature of graphene(GNPs),in this work,the electroless pla-ting process was employed to modify graphene with metal Ni(Ni@GNPs)and then the plasma spraying technology was used to prepare NiCoCrAlY,NiCoCrAlY+GNPs and NiCoCrAlY+Ni@GNPs coatings on the surface of K465 superalloy.The effects of process factors such as ultrasound-assisted,reaction temperature and reaction time of electroless plating on the graphene modified quality was mainly investigated.The influence of adding Ni@GNPs on the microstructure and mechanical properties of plasma sprayed NiCoCrAlY coatings was further studied.The results showed that after electroless plating,metal Ni coatings were uniformly deposited on the GNPs surface.When the electroless plating reaction was carried out under the condition of assisting ultrasonic reaction at 50℃for 40 min,the modification effect of GNPs was improved.Compared with NiCoCrAlY and NiCoCrAlY+GNPs coatings,adding Ni@GNPs could significantly decrease the pores and cracks of coatings,and enhance the density of coatings,as well as substantially reduce the porosity.Furthermore,the hardness of NiCoCrAlY+Ni@GNPs coatings was increased by 30.9%and the erosion rate was reduced by 7.4%than that of NiCoCrAlY coatings,indicating that the addition of Ni@GNPs could also improve the mechanical property and erosion resistance of NiCoCrAlY coatings.

关 键 词：等离子喷涂 石墨烯 化学镀 NICOCRALY涂层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]