汽轮机阀门部件防护涂层高温滑动摩擦学性能研究  

Study of High-Temperature Sliding Friction Properties of Protective Coatings for Steam Turbine Valve Components

作　　者：姚超 曹晓英 方伦彬 王伟 李定骏 巩秀芳 王斌[1] YAO Chao;CAO Xiaoying;FANG Lunbin;WANG Wei;LI Dingjun;GONG Xiufang;WANG Bin(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;National Key Laboratory of Clean and Efficient Turbine Power Equipment,Deyang 618000,China;Dongfang Electric Group Dongfang Turbine Co.,Ltd.,Deyang 618000,China)

机构地区：[1]西南石油大学新能源与材料学院,四川成都610500 [2]清洁高效透平动力装备全国重点实验室,四川德阳618000 [3]东方电气集团东方汽轮机有限公司,四川德阳618000

出　　处：《材料保护》2024年第7期59-65,118,共8页Materials Protection

摘　　要：针对汽轮机阀门部件防护涂层高温往复摩擦磨损问题,在马氏体耐热钢基体表面采用超音速火焰喷涂工艺制备NiCr/Cr_(3)C_(2)-NiCr金属陶瓷复合涂层,对涂层进行了高温滑动磨损性能测试,研究了涂层在630℃下不同往复频率下的高温磨损行为,分析阀门部件防护涂层的高温滑动摩擦学性能。结果表明:NiCr粘接层在一定程度上提高了涂层的结合强度和热稳定性;涂层的摩擦学性能受到摩擦产物的影响,涂层磨损表面主要表现为黏着磨损和氧化磨损;往复频率通过影响氧化磨损的剧烈程度而影响涂层的高温耐磨性能,频率的加大会加快氧化膜从形成到破裂的进程,在非连续磨损模式下,涂层的磨损率较连续模式降低35.6%。In order to address the problem of high-temperature reciprocating friction and wear of protective coatings for steam turbine valve components,NiCr/Cr_(3)C_(2)-NiCr metal-ceramic composite coatings were prepared on the surface of martensitic heat-resistant steel substrate by high-velocity oxygen-fuel spraying process(HVOF).The high-temperature sliding wear characteristics of the coatings were tested,and the high-temperature wear behavior of the coatings at 630℃was studied at different frequencies,so as to analyze the high-temperature sliding wear performance of protective coatings for valve parts.Results showed that the NiCr adhesive coatings improved the bonding strength and ther-mal stability of the coating to a certain extent,and the tribological properties of coatings were affected by the friction products.Additionally,the wear surface of the coating mainly manifested as adhesive wear and oxidation wear.The reciprocating frequency affected the high-temperature wear resistance of the coating through the intensity of oxidative wear,and the increase in the frequency accelerated the process from formation to rupture of the oxide film.Besides,under the condition of discontinuous wear,the wear rate of the coating decreased by 35.6%compared to that of continuous wear mode.

关 键 词：超音速火焰喷涂 NiCr/Cr3C2-NiCr涂层 高温摩擦磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]