煤油流量对NiCrBSi-CrSi_(2)涂层微观结构及高温磨损性能的影响  

Effect of Kerosene Flow on Microstructure and High Temperature Wear Properties of NiCrBSi-CrSi_(2)Coating

作　　者：王志强 刘侠 张世宏[1,2] 任奕 杨康 杨阳 薛召露 Wang Zhiqiang;Liu Xia;Zhang Shihong;Ren Yi;Yang Kang;Yang Yang;Xue Zhaolu(Key Laboratory of Green Preparation and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Ma’anshan 243002,China;School of Materials Science and Engineering,Anhui University of Technology,Ma’anshan 243002,China)

机构地区：[1]安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室,安徽马鞍山243002 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243002

出　　处：《稀有金属材料与工程》2024年第3期825-833,共9页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52201058,U22A20110);安徽省高校协同创新项目(GXXT-2020-071)。

摘　　要：在12CrMoVG基体上通过超音速火焰喷涂(HVOF)技术,分别采用不同煤油流量制备了NiCrBSi-CrSi_(2)复合涂层。利用XRD、SEM、EDS、Raman、维氏显微硬度计、电子拉伸试验机和高温旋转式摩擦磨损试验机分别表征了不同煤油流量下涂层物相、组织结构、力学性能和高温摩擦磨损性能。结果表明:不同煤油流量涂层的物相组成基本相同,均有γ-Ni、Ni_(3)B、Cr_(2)B、CrSi_(2)和Cr_(5)Si_(3),但随着煤油流量的升高,涂层中的CrSi_(2)和Cr_(2)B的部分会分别转变为Cr_(5)Si_(3)和CrB相。涂层显微硬度和结合强度随着煤油流量的升高均呈现先增后减的趋势,孔隙率和磨损率表现出先减后增的趋势。当煤油流量为30 L/h时,粉末熔融效果最好,涂层的孔隙率最低为0.17%,显微硬度(HV0.3)最高达到5576.2 MPa,结合强度最高为59MPa,磨损率最低为2.84×10^(-14)m^(3)·(N·m)^(-1)。磨痕表面产生的Cr_(2)O_(3)、SiO_(2)和NiCr_(2)O_(4)等氧化物以及较高的涂层硬度使得30 L/h的涂层显示出最优的耐高温摩擦磨损性能。涂层的磨损机制以氧化磨损和黏着磨损为主。The NiCrBSi-CrSi_(2)composite coating was prepared by supersonic flame spraying(HVOF)technology on the 12CrMoVG substrate at different kerosene flow rates.The coating phase,microstructure,mechanical properties and high temperature friction and wear properties were characterized by XRD,SEM,EDS,Raman,Vickers microhardness tester,electronic tensile testing machine and high temperature rotational friction and wear testing machine at different kerosene flow rates.The results show that the phase composition of coatings is basically the same,all of which haveγ-Ni,Ni_(3)B,Cr_(2)B,CrSi_(2)and Cr_(5)Si_(3).But as the kerosene flow increases,the CrSi_(2)and Cr_(2)B parts in the coating will be transformed into Cr_(5)Si_(3)and CrB phases,respectively.The microhardness and bonding strength of the coating show a trend of first increasing and then decreasing with the increase in kerosene flow,and the porosity and wear rate show a trend of first decreasing and then increasing.When the kerosene flow rate is 30 L/h,the powder melting effect is the best,the porosity of the coating is the lowest of 0.17%,the microhardness(HV 0.3)is the highest of 5576.2 MPa,the bonding strength is the highest of 59 MPa,and the wear rate is the lowest of 2.84×10^(-14)m^(3)·(N·m)^(-1).Oxides such as Cr_(2)O_(3),SiO_(2)and NiCr_(2)O_(4)generated on the surface of the wear mark and the high coating hardness make the coating at the kerosene flow rate of 30 L/h show optimal high temperature friction and wear resistance.The wear mechanism of the coating is mainly oxidative wear and adhesive wear.

关 键 词：超音速喷涂 NiCrBSi-CrSi_(2)复合涂层 煤油流量 显微组织 高温磨损性能 

分 类 号：TG174.442[金属学及工艺—金属表面处理]