超音速等离子喷涂NiCrBSi-金刚石复合涂层的微观组织与性能  

Microstructure and Properties of Supersonic Plasma Sprayed NiCrBSi-Diamond Composite Coatings

作　　者：孙浩然 张迪[2] 贾磊[1] 庞诚宇 董书山[3] 周永欣[1] SUN Haoran;ZHANG Di;JIA Lei;PANG Chengyu;DONG Shushan;ZHOU Yongxin(School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,China;Chinese People’s Liberation Army Unit 93160,Beijing 100076,China;State Key Laboratory of Superhard Materials,Jilin University,Changchun 130012,China)

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]中国人民解放军93160部队,北京100076 [3]吉林大学超硬材料国家重点实验室,吉林长春130012

出　　处：《材料保护》2025年第3期60-69,共10页Materials Protection

基　　金：JCJQ计划(2022-JJ-0112)。

摘　　要：为了提高海洋环境下921A钢表面的力学及耐磨耐蚀性能,采用超音速等离子喷涂技术在921A钢表面制备了2种涂层,所采用的粉末分别为NiCrBSi球形粉末以及NiCrBSi与镀铬金刚石(20~40μm)复合粉末,所制备的涂层样品分别标记为涂层N及涂层ND,在后续对比测试中将喷涂基体记为样品921A。分析了涂层的物相组成,观测了涂层的截面形貌和元素组成,测试了涂层的显微硬度和抗拉结合强度,测定了涂层在往复摩擦磨损模式下与Si_3N_4球的摩擦系数及体积磨损率,拟合出了涂层的开路电位及自腐蚀电流密度。结果表明:相比于纯NiCrBSi粉末制备的涂层N,金刚石复合涂层ND的显微硬度及结合强度分别为1016 HV,50.156 MPa,较涂层N提升了15.3%及15.3%。在30 N载荷,Si_(3)N_(4)球作为对摩件,往复时间60 min条件下,金刚石复合涂层ND平均磨痕深度17.738μm,相较基体降低75.8%,体积磨损率为1.40×10^(-5)mm^(3)/(N·m),仅为基体的20.7%,摩擦系数为0.229。在室温、3.5%NaCl溶液环境下,金刚石复合涂层ND自腐蚀电位E_(corr)为-864 mV,较921A基体提升61 mV,自腐蚀电流密度J_(corr)为1.332×10^(-5)A/cm^(2),较921A基体降低了77.9%。To improve the mechanical properties and wear and corrosion resistance of 921A steel surface under marine environment,two kinds of coatings were prepared on the surface of 921A steel by supersonic plasma spraying technology.The powders used were NiCrBSi spherical powder and NiCrBSi composite powder with chromium plated diamond(20~40μm).The prepared coating samples were labeled as coating N and coating ND respectively,and the spray substrate was labeled as sample 921A in the subsequent comparison test.Moreover,the phase composition of the coating was analyzed,the cross section morphology and element composition of the coating were observed,the microhardness and tensile bond strength of the coating were tested,the friction coefficient and volume wear rate of the coating with Si3N4 ball under the reciprocating friction and wear mode were measured,and the open circuit potential and self-corrosion current density of the coating were fitted.Results showed that compared with the coating N prepared by pure NiCrBSi powder,the microhardness and bonding strength of diamond composite coating ND were 1016 HV and 50.156 MPa,which were 15.3%and 15.3%higher than those of coating N.Under the condition of 30 N load,Si_(3)N_(4)ball as the grinding object and reciprocating time of 60 min,the average ND wear depth of diamond composite coating was 17.738μm,exhibiting a 75.8%decrease relative to the substrate.The volume wear rate was 1.40×10^(-5)mm^(3)/(N·m),which was only 20.7%of the substrate,and the friction coefficient was 0.229.At room temperature and 3.5%NaCl solution,the ND self-corrosion potential Ecorr of the diamond composite coating was-864 mV,which was 61 mV higher than that of the 921A substrate,and the self-corrosion current density J_(corr)was 1.332×10^(-5)A/cm^(2),which was 77.9%lower than that of the 921A substrate.

关 键 词：等离子喷涂 NICRBSI 金刚石 复合涂层 力学性能 耐磨性能 

分 类 号：TG174.442[金属学及工艺—金属表面处理]