摘要
采用真空电弧镀(AIP)技术在镍基高温合金DSM11基体表面制备NiCoCrAlYSiHf涂层,并通过化学方法对涂层进行完全退除。通过高温持久、高温瞬时拉伸等力学实验评价涂层退除及再涂覆对基体合金力学性能的影响,并采用扫描电子显微镜(SEM)观察和分析涂层退除前后的截面形貌。结果表明:采用1^(#)溶液可以有效退除NiCoCrAlYSiHf涂层,反应时间达180 min时,试样减重0.1078 g,涂层基本完全退除。涂层退除后,涂层/基体合金界面及基体合金的微观组织形貌与原始状态相比基本保持不变,表明退除过程未对基体合金造成显著影响。在涂层退化过程中,涂层逐层剥落,失重与反应时间呈规律性变化,验证了该现象。NiCoCrAlYSiHf涂层对DSM11合金的力学性能无显著影响,涂层退除对基体合金的高温持久性和高温瞬时拉伸性能也基本无影响。
NiCoCrAlYSiHf coatings are deposited on the DSM11 Ni-based superalloy substrate using arc ion plating(AIP)technology,followed by complete removal of the coatings through a chemical method.The effects of coating removal and subsequent recoating on the mechanical properties of the substrate alloy are evaluated through high-temperature creep,instantaneous tensile tests,and other mechanical testing.Scanning electron microscopy(SEM)is employed to observe and analyze the cross-sectional morphology of the substrate before and after coating removal.Results show that solution 1^(#)effectively removes the NiCoCrAlYSiHf coating,with a mass loss of 0.1078 g after 180 minutes,achieving near-complete coating removal.After complete coating removal,the coating/substrate alloy interface and the microstructural morphology of the substrate alloy remain essentially unchanged from the original state,indicating that the removal process has no impact on the substrate alloy.During coating degradation,the coating layers detach progressively,and the mass loss of the coating correlates with reaction time,confirming this observation.Test results show that the NiCoCrAlYSiHf coating has no significant impact on the mechanical properties of the DSM11 alloy,and the coating removal has minimal effect on the high-temperature creep and instantaneous tensile performance of the substrate alloy.
作者
蔡妍
张涛
赵文君
牟仁德
张学军
CAI Yan;ZHANG Tao;ZHAO Wenjun;MU Rende;ZHANG Xuejun(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation,Beijing 100095,China;AECC Shenyang Aero Engine Research Institute,Shenyang 110015,China)
出处
《材料工程》
北大核心
2025年第6期44-51,共8页
Journal of Materials Engineering
基金
国家科技重大专项(J2019-Ⅶ-0010-0150)
中国航发北京航空材料研究院院基金(KJ42250521)。
