HVOF喷涂CoCrWSi和Stellite-6涂层的结构与高温摩擦学性能研究  

Microstructure and High-temperature Tribological Properties of HVOF Sprayed CoCrWSi and Stellite-6 Coatings

作　　者：陈基容 张进[1] 王伟 曹晓英[2,3] 王勤英 袁豪贵[1] CHEN Jirong;ZHANG Jin;WANG Wei;CAO Xiaoying;WANG Qinying;YUAN Haogui(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment,Sichuan Deyang 618000,China;Dongfang Electric Corporation Dongfang Turbine Co.,Ltd.,Sichuan Deyang 618000,China)

机构地区：[1]西南石油大学新能源与材料学院,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：《表面技术》2024年第19期212-222,共11页Surface Technology

基　　金：长寿命高温材料国家重点实验室开放课题(DTCC28EE200794);四川省科技厅重点研发技术项目(2021YFG0266)。

摘　　要：目的提高F92耐热钢基体在600、630℃下的高温耐磨性能。方法采用超音速火焰喷涂方法(High velocity oxy-fuel,HVOF)在F92表面制备CoCrWSi、Stellite-6两种涂层,利用扫描电子显微镜(Scanning electron microscope,SEM)和X射线衍射仪(X-ray diffraction,XRD)分析涂层的表面、截面形貌和物相组成,通过显微维氏硬度计(HV-1000STA)、高温摩擦磨损试验机(UMT-TRIBOLAB)、二维轮廓仪(TencorD-100)测定其显微硬度、高温摩擦学性能和磨痕体积。结果采用超音速火焰喷涂技术制备的CoCrWSi、Stellite-6两种涂层表面较平整,与基体结合紧密,内部组织均匀无裂纹,涂层的厚度约为200μm。XRD分析表明,CoCrWSi、Stellite-6涂层在室温下的物相都由γ(Co)、Cr_(7)C_(3)、CrSi_(2)组成。硬度及耐磨性能测试显示,CoCrWSi、Stellite-6涂层的维氏硬度相较于F92基体分别提高了3.12、2.68倍,F92耐热钢在600、630℃时的平均摩擦因数分别为0.87、0.86,体积磨损率分别为0.49×10^(-4)、1.11×10^(-4)mm^(3)/(N·m),其磨损机理主要为疲劳磨损、黏着磨损、氧化磨损。相较于基体,CoCrWSi涂层在2种温度下的平均摩擦因数分别降低了68%、71%,约为0.28、0.25,体积磨损率分别降低了约95%、97%,为0.20×10^(-5)、0.30×10^(-5)mm^(3)/(N·m),这主要归功于内部的Cr2O3、γ(Co)、Co_(3)O_(4)相在高温摩擦过程中具有良好的润滑效果。Stellite-6涂层也能在一定程度上改善基体的高温耐磨性能,其平均摩擦因数为0.85、0.71,体积磨损率为0.32×10^(-4)、0.57×10^(-4)mm^(3)/(N·m)。2种涂层的主要磨损机理均为磨粒磨损和黏着磨损。结论采用超音速火焰喷涂制备的CoCrWSi、Stellite-6涂层可以改善F92耐热钢在600、630℃下的耐高温滑动磨损性能,且CoCrWSi涂层的防护效果更佳。To enhance the high-temperature wear resistance of F92 heat-resistant steel at 600℃and 630℃,two kinds of CoCrWSi and Stellite-6 coatings were fabricated via high-velocity oxy-fuel(HVOF)spraying.The surface and cross-sectional characteristics,as well as the phase composition of the coatings,were examined by scanning electron microscopy(SEM)and X-ray diffraction(XRD).Micro-hardness measurements were conducted with a Microvickers hardness tester(HV-1000STA).The tribological properties and volumetric wear rates were evaluated with a high-temperature tribotester(UMT-TRIBOLAB)and a two-dimensional profilometer(TencorD-100),with wear morphology and phase analysis performed by SEM and XRD.The SEM revealed that both coatings were well-adhered to the substrate,with smooth surfaces,uniform internal structures,and no cracks,averaging a thickness of approximately 200μm.XRD identified the main phases of the coatings as Co,Cr_(7)C_(3),and CrSi_(2)at room temperature.The presence of Cr_(7)C_(3)and CrSi_(2)phases in both coatings contributed to increasing hardness and wear resistance.The Co phase served as a lubricant,reducing the wear rate during sliding.Hardness and wear resistance tests indicated that the Vickers hardness of the CoCrWSi and Stellite-6 coatings were 3.12 and 2.68 times greater than that of the F92 substrate,respectively.The average friction coefficients for the F92 steel at 600℃and 630℃were 0.87 and 0.86,with corresponding volumetric wear rates of 0.49×10^(-4)mm^(3)/(N·m)and 1.11×10^(-4)mm^(3)/(N·m).The primary wear mechanisms for the F92 matrix were identified as fatigue,adhesive,and oxidation wear.Compared with the substrate,the CoCrWSi coating demonstrated a significant reduction in friction coefficients(68%and 71%)at two temperatures,which were about 0.28 and 0.25,respectively.The volumetric wear rates were reduced by about 95%and 97%,which were 0.20×10^(-5)mm^(3)/(N·m)and 0.30×10^(-5)mm^(3)/(N·m),at both temperatures,respectively.This was mainly attributed to the lubricating effects of int

关 键 词：CoCrWSi涂层 超音速火焰喷涂 高温摩擦 Stellite-6涂层 磨损机制 摩擦学性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]