摘要
为探究高温润滑耐磨涂层抗高温氧化行为,采用激光辅助等离子喷涂技术(LPHS)在GH4065A镍基高温合金上制备NiCoCrAlYTa-Cr_(2)O_(3)-Cu-Mo涂层,研究了该涂层在(850~1000)℃×220 h的抗高温氧化行为。计算得出氧化激活能约为128.5 kJ·mol^(-1),850、900、1000℃氧化速率常数分别为1.44×10^(-2)、3.61×10^(-2)、7.71×10^(-2)mg^(2)·cm^(-4)·h^(-1)。结果表明,850℃×220 h氧化后表面生成Al_(2)O_(3)为主的连续致密氧化膜,阻碍涂层内部的进一步氧化;1000℃×220 h氧化后表面生成疏松NiO为主,致密Cr_(2)O_(3)·NiO为辅的氧化膜。致密氧化膜的生成阻止了涂层及基体的进一步氧化。
NiCoCrAlYTa-Cr_(2)O_(3)-Cu-Mo high temperature lubrication wear-resistant coating was prepared on the GH4065A nickel-based superalloy by laser-assisted plasma spraying(LPHS)technology,and then the high temperature oxidation resistance of the coating at 850-1000℃for 220 h was investigated.The calculated oxidation activation energy is about 128.5 kJ·mol^(-1),and the oxidation rate constants at 850,900 and 1000℃are 1.44×10^(-2),3.61×10^(-2),7.71×10^(-2)mg^(2)·cm^(-4)·h^(-1),respectively.The experimental results show that after oxidation at 850℃for 220 h,a continuous and dense oxide film dominated by Al_(2)O_(3)is formed on the surface,which can prevent the further oxidation inside the coating.After oxidation at 1000℃for 220 h,an oxide film consisting mainly of loose NiO and supplemented by dense Cr_(2)O_(3)·NiO is formed on the surface.The formation of dense oxide film prevents further oxidation of both the coating and the GH4065A superalloy substrate.
作者
聂梓杏
王长亮
张昂
张梅
郭孟秋
田浩亮
崔永静
王天颖
Nie Zixing;Wang Changliang;Zhang Ang;Zhang Mei;Guo Mengqiu;Tian Haoliang;Cui Yongjing;Wang Tianying(Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material,AECC Beijing Institution of Aeronautical Materials,Beijing 100095,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2023年第2期247-255,共9页
Heat Treatment of Metals
基金
国家科技重大专项(2017-VII-0013-0110)。
关键词
激光辅助热喷涂
高温润滑耐磨涂层
高温氧化
氧化速率常数
laser-assisted thermal spraying
high temperature lubrication wear resistant coating
high temperature oxidation
oxidation rate constant
