DZ22B高温合金定向叶片粘砂形成机制与抑制措施  

Formation Mechanism and Restraining Measures of Burning-on of DZ22B Directionally Solidified Blade

作　　者：李飞[1] 陈晓燕 赵彦杰[1] 王飞[1] 孙宝德[1] 孙东科[3] 李振锋 LI Fei;CHEN Xiaoyan;ZHAO Yanjie;WANG Fei;SUN Baode;SUN Dongke;LI Zhenfeng(Shanghai Key Laboratory for High Temperature Materials and Precision Forming,Shanghai Jiao Tong University,Shanghai 200240,China;Instrumental Analysis Center,Shanghai Jiao Tong University,Shanghai 200240,China;School of Mechanical Engineering,Southeast University,Nanjing 211189,China;National South Aviation Industry Co.,Ltd.,Zhuzhou 412000,Hunan,China)

机构地区：[1]上海交通大学上海市先进高温材料及其精密成形重点实验室,上海200240 [2]上海交通大学分析测试中心,上海200240 [3]东南大学机械工程学院,南京211189 [4]中国航发南方工业有限公司,湖南株洲412000

出　　处：《航空材料学报》2018年第5期80-87,共8页Journal of Aeronautical Materials

基　　金："十三五"装备预研共用技术项目(41423040206;41423040203);"十三五"两机重大专项(2017-VII-0008);上海市产学研合作年度计划项目(沪CXY-2016-004)

摘　　要：采用SEM、EDS等分析手段研究DZ22B合金定向叶片粘砂层的微观形貌与化学组成。结果表明:合金熔体渗入型壳面层孔隙中,包覆部分陶瓷颗粒形成金属-陶瓷状粘砂缺陷;粘砂层主要成分为Al2O3,并含有Cr2O3和HfO2这两种合金熔体与电熔刚玉陶瓷型壳的高温界面反应产物;DZ22B合金定向叶片表面粘砂缺陷的形成机制是以热机械渗透粘砂机制为主;向型壳面层浆料中加入一定量的粘砂抑制剂,可显著改善电熔刚玉型壳面层抗合金熔体渗透性能,经浇注验证,叶片表面光洁无粘砂,呈现出明显的金属光泽。The microstructure and chemical composition of the burning-on layer of the directionally solidified blade of the DZ22B superalloy were studied by means of SEM and EDS.The results show that the metal ceramic like sand defects are formed by a part of ceramic particles covered during the infiltration of metal to shell surface pores.The main component of the burning-on layer composes fused corundum,with some interfacial reaction products containing Cr2O3 and HfO2.According to the results of SEM analysis of blade cross section,the mechanism of the burning-on of the DZ22B directionally solidified blade is mainly caused by thermo mechanical permeation.A certain amount of burning-on inhibitor is added to the shell surface slurry,which significantly improves the penetration resistance of the fused corundum shell surface.The casting verifies that the surface of the DZ22B directionally solidified blade is smooth without burning-on,and the metallic luster on the blade surface is obviously observed.

关 键 词：DZ22B高温合金 定向叶片 陶瓷型壳 粘砂 抑制措施 

分 类 号：TG146.1[一般工业技术—材料科学与工程]