摘要
针对电站锅炉受热面管、风机等构件的耐磨应用场景,应用了不同碳及稀土元素含量的2种FeCr基涂层材料,通过高速电弧喷涂技术在基体20G钢上制备涂层。采用光学显微镜、扫描电子显微镜、X射线衍射仪、白光干涉仪系统表征涂层微观形貌及相组成,通过维氏显微硬度、拉伸结合强度、球-盘摩擦磨损试验检测涂层的力学及耐磨性能。结果表明:2种涂层微观结构均呈典型的层片状结构,由于硼、碳等硬质相元素分布于FeCr固溶体中,使得涂层的硬度远高于基体。高碳含量及稀土元素的添加使得涂层孔隙率由2.22%±0.47%降低至0.92%±0.13%,硬度从(8.05±0.53)GPa增加至(10.47±0.68)GPa,磨损质量损失降低40%。从涂层的磨损形貌来看,高硬度及低孔隙率使得磨损机制由黏着磨损转化为磨粒磨损。通过FeCr基涂层对磨损表面进行防护,可以有效解决电站锅炉部件的磨损问题,保证锅炉机组的安全稳定运行。
Based on the wear resistance application scenarios of the heat surface tubes,fans and other components of popwer station boiler,coatings were prepared on the substrate 20 G steel by high velocity arc-spraying technology with the application of two kinds of FeCr-based coating materials containing different carbon and rare earth element contents.Subsequently,the microscopic morphology and phase composition of the coatings were characterized through optical microscope(OM),scanning electron microscope(SEM),X-ray diffractometer(XRD)and white light interferometer system,and the mechanical and wear resistance properties of the coatings were tested through Vickers microhardness,tensile bonding strength,ball-disk friction and wear tests.Results showed that the microstructure of these two coatings was a typical lamellar structure.As B,C and other hard phase elements were distributed in FeCr solid solution,the microhardness of the coatings was much higher than that of the substrate.Furthermore,the high carbon content and the addition of rare earth elements contributed to a decrease of the porosity of the coatings from 2.22±0.47%to 0.92±0.13%,an increase of the microhardness from 8.05±0.53 GPa to 10.47±0.68 GPa,and a reduction of the wear weight loss by 40%.Judging from the wear morphology of the coatings,high microhardness and low porosity made the wear mechanism changed from adhesive wear to abrasive wear.In general,applying FeCr-based coatings to protect the wear surfaces could effectively solve the wear problem of the boiler parts of the power station,and thus ensure the safe and stable operation of the boiler units.
作者
钱维兴
李杰
盛耀飚
刘成威
覃恩伟
陈国星
陆海峰
魏少翀
尹嵩
吴树辉
QIAN Wei-xing;LI Jie;SHENG Yao-biao;LIU Cheng-wei;TAN En-wei;CHEN Guo-xing;LU Hai-feng;WEI Shao-chong;YIN Song;WU Shu-hui(Wujiang Luosen Chemical Co.,Ltd.,Suzhou 215237,China;Suzhou Nuclear Power Research Institute,Suzhou 215004,China)
出处
《材料保护》
CAS
CSCD
2022年第5期10-17,共8页
Materials Protection
关键词
高速电弧喷涂
FeCr基涂层
微观结构
力学性能
耐磨性能
high velocity arc-spraying
FeCr-based coating
microstructure
mechanical properties
wear resistance
