HVOF热喷WC-12Co和Ni60涂层在不同攻角下的固体粒子冲蚀行为  

Solid Particle Erosion Behavior of HVOF Thermal Spray WC-12Co and Ni60 Coatings at Different Angles of Attack

作　　者：奚运涛 贾毛 张军[2] 黄雪萍 乔玉龙 XI Yun-tao;JIA Mao;ZHANG Jun;HUANG Xue-ping;QIAO Yu-long(Xi'an Key Laboratory of High Performance Oil and Gas Field Materials,School of Material Science and Engineering,Xi’an Shiyou University,Xi'an 710065,China;Department of Science and Technology Management,Changqing Oilfield Company,CNPC,Xi'an 710021,China;No.2 Gas Production Plant,Changqing Oilfield Company,CNPC,Xi'an 710200,China;No.1 Gas Production Plant,Changqing Oilfield Company,CNPC,Xi'an 710018,China)

机构地区：[1]西安石油大学材料科学与工程学院西安市高性能油气田材料重点实验室,西安710065 [2]中国石油长庆油田分公司科技发展部,西安710021 [3]中国石油长庆油田分公司第二采气厂,西安710200 [4]中国石油长庆油田分公司第一采气厂,西安710018

出　　处：《表面技术》2022年第12期109-115,共7页Surface Technology

基　　金：陕西省重点学科专项资金资助项目(YS37020203);西安石油大学青年科研创新团队建设项目(2019QNKYCXTD14);西安石油大学研究生创新与实践能力培养计划资助项目(YCS20212110)。

摘　　要：目的解决输气管线弯头冲蚀损伤而导致的刺漏问题。方法采用超音速火焰喷涂(HVOF)方法在20#钢基材上分别制备WC-12Co和Ni60涂层。采用显微硬度计测试基材及涂层截面显微硬度。采用X射线衍射仪(XRD)分析涂层表面成分。采用自制喷射式气固冲蚀试验机开展30°、50°、90°3种攻角下固体粒子冲蚀(SPE)试验。采用扫描电子显微镜(SEM)观察SPE试验前后表面和截面的微观形貌,开展基材和2种涂层的SPE机理及冲蚀速率研究。结果在30°攻角下,SPE机理以犁削为主,冲蚀速率受表面硬度的影响较大,20#钢冲蚀速率最大,而WC-12Co涂层的冲蚀速率最小;在50°攻角下,SPE机理为犁削和多冲疲劳混合机理,20#钢的冲蚀速率仍然最大,Ni60涂层和WC-12Co涂层的冲蚀速率相当,均较小;在90°攻角下,冲蚀机理以多冲疲劳损伤为主,WC-12Co涂层的缺陷较少,界面无裂纹,冲蚀速率最小,而Ni60涂层界面处存在裂纹,内部缺陷较多,抗疲劳性能差,冲蚀速率最高。结论WC-12Co涂层在3种不同攻角下都表现出优异的抗冲蚀性能,为提升输气管线弯头抗冲蚀损伤提供了有力的保障。In order to solve the problem of penetration and leakage caused by erosion damage of elbow of gas transmission pipeline,it is found that there are many influencing factors of solid particle erosion,and the erosion attack angle is one of the most key factors.In view of the above problems,two kinds of coatings,such as WC-12Co and Ni60,were prepared on 20#steel substrate by DJ2700 high-velocity oxygen-fuel spraying(HVOF)equipment.The microstructure of the coating surface and section were observed by Nova Nano SEM450 scanning electron microscope(SEM).HXD-1000TMC/LCD microhardness tester was used to measure the hardness of coating section.XRD-6000 X-ray diffractometer(XRD)was used to analyze the coating composition of the surface coating of the samples.The self-made jet gas-solid erosion tester was used to carry out the solid particle erosion(SPE)test at three attack angles of 30°,50°and 90°,and the micro morphology of the surface before and after the SPE test was observed by scanning electron microscope(SEM).The SPE mechanism and erosion rate of the substrate and the two coatings were studied through comprehensive analysis of the above test data.The results the microhardness of 20#steel substrate was the lowest,which was 139.5HV0.1.The microhardness of Ni60 coating and WC-12Co coating were significantly improved,which were 1229.1HV0.1 and 613.1HV0.1,respectively.At the angle of attack of 30°,the SPE mechanism is mainly ploughing,and the erosion rate is greatly affected by the surface hardness.The erosion rate of 20#steel substrate is the largest,which is 0.0405 mg/g,followed by Ni60 coating,which is 0.0288 mg/g,and the erosion rate of the WC-12Co coating is the smallest,which was 0.0108 mg/g.The WC coating has the highest hardness.At small angle of attack SPE,the coating basically does not have plastic deformation,and the coating is denser with few defects.The coating surface is flat and the furrow is shallow.At the angle of attack of 50°,the SPE mechanism is a mixed mechanism of ploughing and multi-impact fatig

关 键 词：WC-12CO涂层 NI60涂层 冲蚀 攻角 弯头 

分 类 号：TH117[机械工程—机械设计及理论]