Ni添加剂对Mo2FeB2基金属陶瓷的显微组织和力学性能的影响  

Influence of Ni Addition on Microstructure and Mechanical Properties of Mo2FeB2Based Cermets

作　　者：闫东东 余海洲[1] 刘文俊[1] Yan Dongdong;Yu Haizhou;Liu Wenjun(College of Mechanical&Materials Engineering,China Three Gorges University,Yichang Hubei 443002,China)

机构地区：[1]湖北三峡大学机械与材料学院,湖北宜昌443002

出　　处：《硬质合金》2020年第1期38-42,共5页Cemented Carbides

基　　金：国家自然科学基金资助项目《低成本细晶Mo2FeB2基金属陶瓷的制备及晶粒长大抑制机制研究》(No.51304124);湖北省自然科学基金资助项目《Mo2FeB2基金属陶瓷微晶化结构界面过渡层形成机制及控制研究》(No.2018CFB653)。

摘　　要：利用真空液相烧结制备了两种不同Ni含量的Mo2FeB2基金属陶瓷,采用SEM和EDX研究了Ni添加剂对金属陶瓷显微组织和力学性能的影响,结果表明:Ni添加剂同时存在于粘结相和硬质相中,但未对其硬质相颗粒尺寸产生明显影响。Ni添加剂明显提高了金属陶瓷的抗弯强度,其数值从约1 750 MPa增加到2 200 MPa。第一性原理计算结果表明:相对于Mo2FeB2相,Mo2(Fe,Ni)B2相具有相对较好的塑性,但理论计算硬度较低。The Mo2 FeB2 based cermets with different Ni content were prepared by reaction sintering process.The effect of Ni addition on the microstructure and mechanical properties of the Mo2 FeB2 based cermets was studied by scanning electron microscopy(SEM) and energy dispersive X-ray analysis(EDX).The experimental results show that the Ni addition occurs in the binder phase and hard phase.Although the Ni addition has no obvious effect on the microstructure,the transverse rupture strength(TRS) is significantly increased from 1 750 MPa to 2 200 MPa.The results of the first principle calculations show that the Mo2(Fe,Ni)B2 phase has a relatively higher plasticity and lower hardness compared with that of the Mo2 FeB2 phase.

关 键 词：MO2FEB2基金属陶瓷 显微组织 力学性能 第一性原理计算 

分 类 号：TG148[一般工业技术—材料科学与工程]