摘要
为了探究热障涂层体系中不同类型黏结层的热腐蚀行为,对比评价了4种典型黏结层(普通NiAl涂层、NiCoCrAlY涂层、Pt改性NiAl涂层以及Pt+Hf改性NiAl涂层)在900℃条件下Na2SO4/NaCl(质量分数75%∶25%)混合盐中的热腐蚀行为。利用扫描电镜、X射线衍射以及电子探针等手段分析了热腐蚀过程中的物相结构、显微组织演变规律。研究结果表明,普通NiAl涂层退化最快,NiCoCrAlY涂层的退化速率相对NiAl涂层有所减慢,两种改性NiAl涂层表现出较好的抗热腐蚀性能,其中Pt改性NiAl涂层具有最佳的抗热腐蚀能力,相比之下Hf元素的加入对Pt–Al涂层抗热腐蚀性能无益。
In order to investigate the hot corrosion behavior of the commonly-used bond coats for thermal barrier coating system,four typical bond coats(i.e.,plain NiAl coating,NiCoCrAlY coating,Pt modified NiAl coating and Pt+Hf co-modified NiAl coating)were comparably evaluated in the mixed salts of Na2SO4/NaCl(mass fraction 75%∶25%)at 900℃.The phase constitution evolution and microstructure change during hot corrosion were analyzed by scanning electron microscope(SEM),electron probe micro-analyzer(EPMA)and X–ray diffractometer(XRD).The results showed that plain NiAl coating degrades fastest during hot corrosion test.In contrast,the degradation rate of NiCoCrAlY coating is slower.The hot corrosion resistance of the two modified NiAl coatings is satisfactory,Pt modified NiAl is the best among the four coatings.It seems that the addition of Hf does not benefit the hot corrosion resistance of Pt–Al coating.
作者
阳颖飞
任盼
鲍泽斌
邓春明
李卫
YANG Yingfei;REN Pan;BAO Zebin;DENG Chunming;LI Wei(Institute of Advanced Wear&Corrosion Resistant and Functional Material,Jinan University,Guangzhou 510632,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;National Engineering Laboratory for Modern Materials Surface Engineering Technology,Guangdong Institute of New Materials,Guangzhou 510650,China;The Key Lab of Guangdong for Modern Surface Engineering Technology,Guangzhou 510650,China)
出处
《航空制造技术》
2020年第14期34-40,47,共8页
Aeronautical Manufacturing Technology
基金
中央高校基本科研业务费(2169334)
广州市科技计划项目(202007020008)
广东省重点领域研发项目(2019B010936001)
广东省自然基金项目(2020A1515010948)
广东省科学院项目(2020GDASYL–20200104028)。
关键词
热障涂层
黏结层
热腐蚀
组织演变
失效行为
Thermal barrier coatings
Bond coats
Hot corrosion
Microstructure evolution
Failure mechanism
