SiC添加相对NiCr-Cr3C2金属陶瓷涂层高温磨损性能的影响  

Effect of SiC on High Temperature Wear Properties of NiCr-Cr3C2 Metal Ceramic Coatings

作　　者：刘侠 薛召露 丁毅[3] 朱广宏 王硕煜 张世宏[2] Xia Liu;Zhaolu Xue;Yi Ding;Guanghong Zhu;Shuoyu Wang;Shihong Zhang(Anhui Masteel Surface Technology Co.,LTD.,Ma'anshan 243000;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Ma'anshan 243002;Ma Steel(group)holding co.LTD,Ma'anshan 243000)

机构地区：[1]安徽马钢表面技术股份有限公司,马鞍山243000 [2]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,马鞍山243002 [3]马钢(集团)控股有限公司,马鞍山243000

出　　处：《热喷涂技术》2020年第3期60-69,共10页Thermal Spray Technology

基　　金：安徽省对外科技合作项目(201904b11020020)。

摘　　要：本文利用超音速火焰喷涂技术(HVOF),在G20钢表面制备了三种不同SiC掺杂含量(5wt.%、10wt.%、15wt.%)的NiCr-Cr3C2金属陶瓷复合涂层,并探究掺杂含量对涂层微观结构、力学性能和摩擦学性能的影响。利用扫描电镜、显微硬度计、拉伸试验机对涂层的微观结构和力学性能进行了表征,使用球盘式摩擦磨损机对三种涂层在400℃下的磨损性能进行了对比研究。结果表明掺杂5wt.%SiC的复合涂层具有最好的力学性能,其显微硬度达到812HV,结合强度达到71MPa。但随着掺杂量的升高,涂层的孔隙率增大,涂层力学性能下降。涂层的抗高温磨损性能随着SiC掺杂量的增加先升高后降低再升高,其中掺杂15wt.%SiC的复合涂层磨损率最低,其值为1.053×10^-12m^3/N·m。在高温磨损环境中,掺杂15wt.%SiC的复合涂层表面形成的Cr2O3、SiO2等氧化物阻隔了磨损表面之间的直接接触,使涂层表现出优异的抗高温磨损性能。In this paper,the NiCr-Cr3C2 composite coatings doped with 5wt.%,10wt.%and 15wt.%SiC were prepared on G20 boiler steel by high velocity oxygen fuel spray(HVOF).The effect of SiC on the microstructure,mechanical and tribological properties of the NiCr-Cr3C2 coatings was investigated.The microstructure and mechanical properties of the composite coatings were characterized by the scanning electron microscopy,microhardness meter and tensile testing machine.The high temperature wear properties of the coatings were investigated by the spherical disc friction and wear machines at 400℃.The results showed that the coating doped with 5 wt.%SiC had the best mechanical properties,and the value of microhardness and bonding strength was up to 812 HV and 71 MPa,respectively.With the increase of doping amount,the porosity of the coatings increased while their mechanical properties decreased.The composite coating with 15 wt.%SiC showed the lowest wear rate of 1.053×10^-12 m^3/N·m,indicating the best high temperature wear resistance.The enhanced high temperature wear resistance was probably due to the formation of the Cr2O3 and SiO2 films on the coating surface,which further blocked the contact between the friction surfaces.

关 键 词：超音速火焰喷涂 NiCr-Cr3C2 SIC掺杂 高温磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]