钴镍比对WC-32%(Co-Ni)-1.3%Cr高黏结剂硬质合金组织与性能的影响  

Effect of Cobalt/Nickel Ratio on Microstructure and Properties of WC-32%(Co-Ni)-1.3%Cr Cemented Carbide with High Bonding Agent

作　　者：姚兴旺 郭继祥[3] 金鹏[1,2] 尹超[1,2] 张卫兵[1,2] Yao Xingwang;Guo Jixiang;Jin Peng;Yin Chao;Zhang Weibing(State Key Laboratory of Cemented Carbide,Zhuzhou Hunan 412000,China;Zhuzhou Cemented Carbide Group Corp.Ltd.,Zhuzhou Hunan 412000,China;Kunming Iron and Steel Co.,Ltd.,Wugang Group,Anning Yunnan 650302,China)

机构地区：[1]硬质合金国家重点实验室,湖南株洲412000 [2]株洲硬质合金集团有限公司,湖南株洲412000 [3]武钢集团昆明钢铁股份有限公司,云南安宁650302

出　　处：《硬质合金》2024年第5期353-360,共8页Cemented Carbides

基　　金：中钨高新科技专项(20220301);中钨高新科技专项“揭榜挂帅”制项目(20230502);湖南省科技创新计划“揭榜挂帅”制项目(2023ZJ1050);湖南创新型省份建设专项(2023GK2091);株洲市科技重大专项(株科办[2021]53号)。

摘　　要：以WC-32%(Co-Ni)-1.3%Cr硬质合金为研究对象,采用粉末冶金方法制备了3种不同钴镍比的硬质合金样品,通过性能测试、微观结构分析及电化学极化曲线测试,研究了钴镍含量变化对WC-32%(Co-Ni)-1.3%Cr高黏结剂硬质合金组织、力学性能及腐蚀性能的影响。结果表明:随Co含量的减少、镍含量的增加,合金的钴磁、矫顽磁力、硬度呈线性关系不断降低,合金的晶粒尺寸、密度几乎不变,合金的横向断裂强度变化幅度很小,横向断裂强度约2 400 MPa。WC-32%(Co-Ni)-1.3%Cr高黏结剂硬质合金随钴镍比的变化,在中性及酸性溶液中腐蚀趋势不同。随Co含量的减少、镍含量的增加,合金在pH=1的H2SO4溶液中的自腐蚀电位增加,腐蚀电流密度降低。钴镍质量比1∶3的合金的耐腐蚀性能远高于钴镍质量比1∶1及钴镍质量比3∶1合金的耐腐蚀性能,高镍合金可显著提高合金在酸性溶液中的耐腐蚀性能。随Co含量的减少、镍含量的增加,合金在pH=7的NaCl溶液中的自腐蚀电位增加,腐蚀电流密度降低,钴镍质量比1∶1及钴镍质量比1∶3合金的耐腐蚀性能无明显差异,但是远高于钴镍质量比3∶1合金的耐腐蚀性能。In this paper,WC-32%(Co-Ni)-1.3%Cr cemented carbide was studied,and three cemented carbide samples with different cobalt/nickel ratios were prepared by powder metallurgy.Through performance testing,microstructure analysis,and electrochemical polarization curve testing,the influence of cobalt and nickel content changes on the microstructure,mechanical properties,and corrosion resistance of WC-32%(Co-Ni)-1.3%Cr cemented carbide with high bonding agent was studied.The results show that with the decrease in cobalt content and the increase in nickel content,the cobalt magnetism,coercivity,and hardness of the cemented carbide decrease linearly.The grain size and density of the cemented carbide remain almost unchanged,and the transverse rupture strength of the cemented carbide changes very little at around 2400 MPa.The corrosion trend of WC-32%(Co-Ni)-1.3%Cr cemented carbide with a high bonding agent varies with the change in cobalt/nickel ratio in neutral and acidic solutions.As the cobalt content decreases,and the nickel content increases,the self-corrosion potential of the cemented carbide increases,and the corrosion current density decreases in H2SO4 solution with pH=1.The corrosion resistance of the cemented carbide with a cobalt/nickel ratio of 1:3 is much higher than that of the cemented carbide with a cobalt/nickel ratio of 1:1 or 3:1.High-nickel cemented carbide can significantly improve the corrosion resistance of the cemented carbide in acidic solutions.With the decrease in cobalt content and the increase in nickel content,the self-corrosion potential of the cemented carbide in NaCl solution with pH=7 increases,and the corrosion current density decreases.There is no significant difference in corrosion resistance between cemented carbides with a cobalt/nickel ratio of 1:1 and 1:3,but it is much higher than the corrosion resistance of cemented carbides with a cobalt/nickel ratio of 3:1.

关 键 词：高黏结剂 硬质合金 成分 腐蚀 极化曲线 

分 类 号：R28[医药卫生—中药学]