Cr对镍铝基金属结合剂性能与显微结构的影响  

Effect of Cr on the properties and microstructure of nickel aluminum metal bond

作　　者：于展翔 何方[1] 谢高赏 YU Zhanxiang;HE Fang;XIE Gaoshang(School of Materials Science and Engineering,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]河南工业大学材料科学与工程学院,郑州450001

出　　处：《粉末冶金技术》2024年第4期374-380,387,共8页Powder Metallurgy Technology

摘　　要：为改善镍铝基金属结合剂力学性能的不足,采用真空热压烧结法将Cr粉添加到镍铝基金属结合剂中,探究Cr粉含量(摩尔分数)和烧结温度对镍铝基金属结合剂的力学性能和显微结构的影响。结果表明:Cr起到固溶强化的作用,可以改善镍铝基金属结合剂的力学性能。当烧结温度为800℃时,随Cr添加量的增多,结合剂的抗折强度呈先增大后减小的趋势,而洛氏硬度呈现整体增大的趋势。当Cr摩尔分数为12%时,其综合性能最佳,抗折强度为178 MPa,洛氏硬度为HRB 104.2,分别较纯镍铝基金属结合剂提高36.9%和6.8%。Vacuum hot pressing sintering was used to add Cr powders to the nickel aluminum metal bond to improve the mechanical properties of nickel aluminum metal bond.The effects of Cr powder content(molar fraction) and sintering temperature on the mechanical properties and microstructure of the nickel aluminum metal bond were studied.The results show that,Cr plays the role of solid solution strengthening,which can improve the mechanical properties of the nickel aluminum metal bond.As the Cr content increases,the flexural strength of the bond increases first and then decreases,while the Rockwell hardness shows an overall increase tendency at 800 ℃.When Cr molar fraction is 12%,the optimal flexural strength and Rockwell hardness are 178 MPa and HRB 104.2,respectively,which are increased by 36.9% and 6.8% compared with the pure nickel aluminum metal bond.

关 键 词：金属结合剂 铬掺杂 微观结构 力学性能 物相组成 

分 类 号：TF125[冶金工程—粉末冶金] TG74.9[冶金工程—冶金物理化学]