NiCoCrAlYHf涂层与一种Ni基单晶高温合金循环氧化行为研究  

Thermal Cyclic Oxidation Behavior Between NiCoCrAlYHf Bond Coat and a Kind of Ni-based Single Crystal Superalloy

作　　者：钟锦岩[1] 牟仁德[1] 何英[2] 何利民[1] 

机构地区：[1]北京航空材料研究院,北京100095 [2]中航工业西安航空发动机(集团)有限公司,西安710021

出　　处：《材料工程》2013年第8期28-35,共8页Journal of Materials Engineering

摘　　要：在第三代Ni基单晶高温合金上制备NiCoCrAlYHf(HY5)高温抗氧化涂层,采用扫描电镜(SEM),能谱分析(EDS)和X射线衍射(XRD)等手段,对涂层表面及界面进行组织形貌观察和相结构分析,研究涂层试样的循环氧化动力学和元素互扩散行为。结果表明:采用真空电弧镀(AIP)方法制备的HY5涂层,提高了单晶高温合金的循环抗氧化能力;在1100℃大气环境中扩散600h后,涂覆HY5涂层的单晶高温合金基体中形成了互扩散区IDZ,互扩散主要由Cr,Ni元素从基体向高温抗氧化涂层的外扩散以及Al元素从高温抗氧化涂层向基体的内扩散构成;在涂层下方60μm左右有拓扑密堆相TCP析出,并形成二次反应区SRZ。A metallic protective coating on the third generation single crystal superalloy was investiga- ted. The coating surface, interface morphology and phase structure of the organization were charac- terized by scanning electron microscopy （SEM）, energy dispersion X-ray spectroscopy （EDS） and X-ray diffraction （XRD）. Interdiffusion behavior of coatings and cyclic oxidation kinetics were ana- lyzed. A single NiCoCrA1YHf coating was deposited onto the single crystal superalloy by arc ion plat- ing （AIP）. The results showed that an interdiffusion zone （IDZ） were formed in Ni-based single crys- tal superalloy after 600h heat treatment at 1100℃ in the atmospheric environment. The elemental in- terdiffusion between the coating and the substrate occured as A1 diffuse inward from the coating to the substrate and Cr diffuse outward from the substrate to the coating. There were amounts of topologi- cally close-packed phases （TCP） precipitated under coating 60μm in the superalloy and ultimately came into being secondary reaction zone （SRZ）.

关 键 词：单晶高温合金 涂层 二次反应区 互扩散 

分 类 号：TG174.4[金属学及工艺—金属表面处理]