不同工艺NiCoCrAlYTa涂层组织形态及抗高温氧化性能研究  

Microstruture and High Temperature Oxidation Resistance of NiCoCrAlYTa Coatings With Different Preparation Processes

作　　者：高明 秦梓铭 李彰 田浩亮 王长亮 郭孟秋 张学军 GAO Ming;QIN Zi-ming;LI Zhang;TIAN Hao-liang;WANG Chang-liang;GUO Meng-qiu;ZHANG Xue-jun(A center of the Naval Armament Department,Beijing 100072,China;Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material,AECC Beijing Institution of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]海军装备部,北京100072 [2]中国航发北京航空材料研究院航空材料先进腐蚀与防护航空科技重点试验室,北京100095

出　　处：《失效分析与预防》2023年第2期93-98,104,共7页Failure Analysis and Prevention

基　　金：国家自然科学基金(52075508);国家重点研发计划(2021YFB3702000);国家科技重点专项(2017-Ⅶ-0012-0109)。

摘　　要：采用激光熔覆和大气等离子喷涂技术在镍基高温合金(GH4169)上制备NiCoCrAlYTa涂层,研究2种涂层的微观组织和高温氧化性能。采用扫描电子显微镜、X射线衍射仪和能谱仪观察涂层的微观组织形态和物相分析。结果表明:激光熔覆涂层中形成胞状亚结构的等轴晶凝固组织,相对于等离子喷涂涂层结构更致密。在1100℃氧化100 h后,喷涂涂层的氧化产物主要为Cr_(2)O_(3)和尖晶石,抗氧化能力降低;而激光熔覆涂层较为致密、孔隙少,氧化产物为γ-matrix、NiO和少量尖晶石,其抗氧化性能明显优于等离子喷涂涂层。NiCoCrAlYTa coatings were prepared on nickel base superalloy(GH4169)by laser cladding and atmospheric plasma spraying.The microstructure and high temperature oxidation properties of the two coatings were studied.The microstructure and phase analysis of the coating were observed by scanning electron microscopy,X-ray diffractometer,and energy dispersive spectrometer.The results show that the equiaxed solidification structure with cellular substructure is formed in the laser cladding coating,which is denser than that of plasma spraying coating.After oxidation at 1100℃for 100 h,the oxidation products of the sprayed coating are mainly Cr_(2)O_(3) and spinel,and the oxidation resistance decreases.However,the laser cladding coating is relatively denser and has less pores,and the oxidation product isγ-Matrix,NiO and a small amount of spinel.The oxidation resistance of laser cladding coating is obviously better than that of plasma spraying coating.

关 键 词：大气等离子喷涂 激光熔覆 NICOCRALYTA涂层 抗氧化性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]