Er_(0.5)Yb_(1.5)Si_(2)O_(7)环境障涂层高温CMAS熔盐腐蚀行为研究  

Study on High-Temperature CMAS Molten Salt Corrosion Behavior of Er_(0.5)Yb_(1.5)Si_(2)O_(7) Environmental Barrier Coating

作　　者：白博添 原慷 彭浩然 章德铭 Bai Botian;Yuan Kang;Peng Haoran;Zhang Deming(BGRIMM Technology Group,Beijing 100160,China;Beijing Engineering Technology Research Center of Surface Strengthening and Repairing of Industry Parts,Beijing 102206,China;Beijing Key Laboratory of Special Coating Materials and Technology,Beijing 102206,China)

机构地区：[1]矿冶科技集团有限公司,北京100160 [2]北京市工业部件表面强化与修复工程技术研究中心,北京102206 [3]特种涂层材料与技术北京市重点实验室,北京102206

出　　处：《热喷涂技术》2023年第4期84-92,83,共10页Thermal Spray Technology

基　　金：国家科技重大专项(2017-VI-0020-0093)

摘　　要：硅基陶瓷材料以其优异的性能成为新一代航空发动机热端的候选材料,其在恶劣的服役环境中需要环境障涂层(Environmental Barrier Coating,EBC)的保护。以稀土硅酸盐为面层的第三代EBC是目前研究的热点之一。采用大气等离子喷涂工艺制备了Er_(0.5)Yb^(1.5)Si_(2)O_(7)环境障涂层面层样品,研究涂层在钙镁铝硅酸盐(CaO-MgO-Al_(2)O_(3)-SiO_(2),CMAS)覆盖浓度15 mg/cm^(2)、保温温度1350℃、保温时间5 h的腐蚀条件下的腐蚀行为。研究发现Er_(0.5)Yb_(1.5)Si_(2)O_(7)涂层与CMAS反应后产物为磷灰石相Ca_(2)(Er_(0.25)Yb_(0.75))_(8)(SiO_(4))_(6)O_(2)与Er_(0.5)Yb_(1.5)Si_(2)O_(7)相,涂层顶部残留CMAS熔盐,内部出现反应区和渗透区。Silicon-based ceramic materials have emerged as candidate materials for the next generation of aerospace engine hot sections due to their excellent performance.However,they require protection in harsh operating environments,necessitating the use of environmental barrier coatings(EBCs).Currently,the third-generation EBCs with rare earth silicates as surface layers have become a focal point of research.In this study,Er_(0.5)Yb_(1.5)Si_(2)O_(7) environmental barrier coating samples were prepared using atmospheric plasma spraying.The corrosion behavior of the coating was investigated under corrosive conditions with a calcium-magnesium-aluminum-silicate(CMAS)coverage concentration of 15 mg/cm^(2),a holding temperature of 1350℃,and a dwell time of 5 hours.The study revealed that the reaction products after the interaction between Er_(0.5)Yb_(1.5)Si_(2)O_(7) coating and CMAS included a phosphorite phase Ca_(2)(Er_(0.25)Yb_(0.75))_(8)(SiO_(4))_(6)O_(2) and Er_(0.5)Yb_(1.5)Si_(2)O_(7) phase.Additionally,remnants of CMAS molten salts were observed at the top of the coating,with distinct regions of reaction and infiltration within the coating.

关 键 词：环境障涂层 熔盐腐蚀 腐蚀行为 

分 类 号：TG174.4[金属学及工艺—金属表面处理]