摘要
为了改善不同水流速度下水轮机过流部件的抗冲蚀性能,采用超音速火焰喷涂(HVOF)技术在不锈钢(0Cr13Ni4Mo)表面制备了纳米粉末WC-10Co4Cr喷涂层。通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)对喷涂层的物相、组织结构进行了分析,并对其显微硬度、孔隙率、结合强度等性能进行了研究,探讨了其不同流速下的冲蚀性能。结果表明:WC-10Co4Cr喷涂层组织致密,孔隙率为0.61%,结合强度为73 MPa,显微硬度为1 410HV2 N;在含有泥沙流水的作用下,流速越快,喷涂层和基体的失重速率也越快,慢速下的喷涂层冲蚀失效机制以沙粒微切削和犁削为主,高速下除了微切削和犁削外,还包括沙粒冲击引起的疲劳剥落。
Nano-structured WC-lOCo4Cr coatings were prepared on the surface of stainless steel （0Crl3Ni4Mo） by high velocity oxy-fuel （HVOF） thermal spraying. Phase composition and microstructure of coating were characterized by X- ray diffractometer （XRD） and scanning electron microscopy （SEM）. The key performances, such as micro-hardness, porosity and bond strength were investigated, and the erosion resistance was evaluated under different flow velocity. Results indicated that the microstructure of nano-structured WC-10Co4Cr coating prepared by HOVF thermal spraying was dense with 0.61% porosity. The binding strength was 73 MPa, and the microhardness was 1 410 HV2 N Under the action of water with silt, the faster flow velocity led to the faster weight loss rate of coating and substrate. When the flow velocity was slow, the coating erosion failure was mostly caused by sand micro-cutting and plough cut. When the flow velocity was fast, the erosion failure mechanism of coating, in addition to micro-cutting and plough cut, also included fatigue spalling caused by sand impact.
作者
陈小明
周夏凉
王莉容
赵坚
毛鹏展
伏利
刘伟
孟金博
CHEN Xiao-ming1,2,3, ZHOU Xia-liang1,2,4, WANG Li-rong3, ZHAO Jian3, MAO Peng-zhan3, FULi2, LIU Wei4, MENG Jin-bo(1.Standard ＆ Quality Control Research Institute, Ministry of Water Resources, Hangzhou 310012, China; 2. Key Laboratory of Research on Hydraulic and Hydro-Power Equipment Surface Engineering Technology of Province, Hangzhou 310012, China; 3. Water Machinery and Remantffacturing Technology Engineering Laboratory of Zhejiang Province, Hangzhou 310012, China; 4. Hangzhou Mechanical Design Research Institute, Ministry of Water Resources, Hangzhou 310012, China)
出处
《材料保护》
CAS
CSCD
北大核心
2018年第9期4-7,共4页
Materials Protection
基金
浙江省科技计划项目(2017C37048,2016C37091)
杭州市科技发展计划项目(20162231E10)资助
关键词
超音速火焰喷涂
纳米WC-10C04Cr粉末
不同水流速
泥沙冲蚀
high velocity oxy - fuel（HVOF） thermal spraying
nano - structured WC - 1OCo4Cr coating
flow velocity
slurry erosion
