DSM11镍基高温合金表面三种涂层高温性能  

High temperature behaviors of three coatings on nickel-based superalloy DSM11

作　　者：李艳明 迟庆新 刘欢 佟文伟 赵世炜 高志坤 LI Yanming;CHI Qingxin;LIU Huan;TONG Wenwei;ZHAO Shiwei;GAO Zhikun(Shenyang Engine Research Institute,Aero Engine Corporation of China,Shenyang 110015,China)

机构地区：[1]中国航空发动机集团有限公司沈阳发动机研究所,沈阳110015

出　　处：《航空动力学报》2021年第7期1499-1508,共10页Journal of Aerospace Power

摘　　要：DSM11镍基高温合金表面制备Al-Si、Al和Co-Al三种涂层,研究三种涂层在900℃下的涂盐(质量分数为5%NaCl+95%Na2SO4)热腐蚀性能和800℃下的疲劳性能。实验结果表明:在900℃热腐蚀200 h后,Al-Si涂层和Co-Al涂层表面腐蚀区均形成了以Al2O3为主的连续且致密的氧化层,抑制热腐蚀反应的进行,具有一定的抗热腐蚀性能;Al涂层表面腐蚀区形成了混合型氧化层,热腐蚀反应会持续进行,抗热腐蚀性能较差。在800℃的疲劳实验后,Al-Si涂层表面生成大量的微裂纹,涂层容易发生开裂,进而引起合金试样快速断裂;Co-Al涂层和Al涂层的合金试样表现较好的抗高温疲劳性能。在高温合金的防护涂层使用中,要充分考虑到涂层的服役环境,对相关性能进行综合评价,选出最适合的防护涂层。Three coatings(Al-Si coating,Al coating and Co-Al coating)were prepared on the surface of nickel-based superalloy DSM11.The hot corrosion behaviors in the salt of 5%NaCl+95%Na2SO4(mass fraction)at 900℃and the fatigue property at 800℃were investigated.The coatings after corrosion for 200 h at 900℃,Al-Si and Co-Al coatings had excellent hot corrosion resistance to further hot corrosion because of a continuous and dense Al2O3 protective layer on the surface.Al coating had poorer hot corrosion resistance for a mixed oxidation layer in the corrosion area,which could not prevent hot corrosion.After fatigue test of the coatings at 800℃,the alloy samples were prone to rapid fracture that a lot of micro cracks appeared on the surface of Al coating.Co-Al and Al coatings showed better high-temperature fatigue performance.In order to select the most suitable protective coating of nickel-based superalloy,service environment and integrated performance should be fully considered.

关 键 词：AL-SI涂层 AL涂层 Co-Al涂层 热腐蚀 疲劳 

分 类 号：V232.4[航空宇航科学与技术—航空宇航推进理论与工程] TG136.1[一般工业技术—材料科学与工程]