热处理对等离子喷涂BSAS环境障涂层性能影响  

Effect of heat treatment on properties of plasma-sprayed BSAS environmental barrier coating

作　　者：崔永静 洪智亮 郭孟秋 王长亮 焦健 成来飞[2] CUI Yongjing;HONG Zhiliang;GUO Mengqiu;WANG Changliang;JIAO Jian;CHENG Laifei(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Science and Technology on Thermostructural Composite Materials Laboratory,Northwestern Polytechnical University,Xi’an 710072,China;AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai 201108,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]西北工业大学超高温结构复合材料重点实验室,西安710072 [3]中国航发商用航空发动机有限责任公司,上海201108

出　　处：《材料工程》2023年第3期59-66,共8页Journal of Materials Engineering

摘　　要：采用自制的固相烧结BSAS粉体,利用大气等离子喷涂工艺在SiC基体表面制备Si/Mullite+BSAS/BSAS三层结构环境障涂层。通过扫描电子显微镜、能谱仪和X射线衍射分析仪等研究环境障涂层在不同热处理温度下涂层的相结构、显微组织演变规律。结果表明:喷涂态BSAS涂层主要由单斜结构BAS相和非晶相组成;经过1100℃热处理后,涂层内部非晶相转变为六方结构BAS相;1200℃热处理后六方结构BAS相逐渐向单斜结构BAS相转变,在1300℃热处理后单斜结构BAS相的含量达到最大;随着热处理温度的进一步上升,出现鳞石英结构的SiO_(2)相和高钡含量的Ba3SiO5相以及副钡长石结构BAS相,1400℃热处理过程中发现硅液滴渗出的现象。Using BSAS powder prepared by solid-state sintering method,Si/Mullite+BSAS/BSAS three-layer environmental barrier coatings were fabricated on SiC substrate by atmospheric plasma spraying process.The phase composition and microstructure evolution behaviour of the environmental barrier coating subjected to various heat treatment temperatures were studied by scanning electron microscope,energy dispersive spectrometer and X-ray diffraction analyzer,etc.The results indicate that as-sprayed BSAS coating is mainly composed of monoclinic BAS phase and amorphous phase;After heat treatment at 1100℃,the amorphous phase inside the coating is transformed to hexagonal BAS phase.With the temperature increases to 1200℃,the hexagonal BAS phase gradually changes to the monoclinic BAS phase.The fraction of the monoclinic BAS phase reaches the maximum at 1300℃heat-treated;With further increase of the heat treatment temperature,tridymite SiO_(2),Ba3SiO5and paracelsian BAS phase appear.Moreover,silicon droplets exude is detected during heat treatment at 1400℃.

关 键 词：环境障涂层 等离子喷涂 碳化硅陶瓷基复合材料 BSAS 

分 类 号：TG174.442[金属学及工艺—金属表面处理]