Mo对Ni_3Al粘结金属陶瓷组织及性能的影响  

Effect of Mo content on microstructure and mechanical properties of Ni_3Al-bonded cermets

作　　者：黄斌[1] 程浩[1] 段建国[1] 熊惟皓[2] 

机构地区：[1]中国工程物理研究院材料研究所,四川江油621907 [2]华中科技大学材料成形与模具技术国家重点实验室,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2017年第6期52-56,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：教育部创新团队资助项目(IRT1244);国家自然科学基金资助项目(51401191)

摘　　要：采用粉末冶金工艺制备了不同Mo含量Ni_3Al粘结金属陶瓷,采用XRD,TEM和EDS等表征技术分析了其组织及成分.结果表明:金属陶瓷组织表现为芯/环结构硬质相颗粒分布在粘结相中,硬质相基本为黑芯-白环结构,而当Mo含量(质量分数)达到15%时,出现灰白色外环-亮白色内环-黑芯结构的硬质相颗粒;同时,随Mo含量的增加,硬质相颗粒明显细化;液相烧结过程中Mo趋向于在碳化物表面聚集析出,形成富Mo内环相.Ni_3Al粘结金属陶瓷力学性能分析表明:抗弯强度和硬度随Mo含量增加先增大后减小,在添加8%质量分数的Mo时达到最大值,分别为1 396 MPa和HRA91.0.Morphology and compositions of Ni_3Al-bonded cermets with different Mo,prepared in powder metallurgy route,were researched by X-ray diffraction（XRD）,transmission electron microscope（TEM）and energy dispersive spectrometer（EDS）in this paper.Results indicate that the cermets show core/rim structure particles embedded in binder and the carbides show black core-white rim structure.When Mo content is 15%,the hard phase particles show grey outer rim-white inner rimblack core structure.Furthermore,hard phase particles are refined apparently with Mo content increasing.During liquid-sintering,Mo tends to aggregate in the surface of undissolved carbide forming inner rim rich in Mo.Mechanical properties of Ni_3Al-bonded cermets were also studied and results indicate that TRS and hardness of increased firstly and then decreased with Mo content increasing,achieving peak values 1 396 MPa and HRA 91.0,respectively at the composition with 8% Mo.

关 键 词：Ni3Al粘结金属陶瓷 Mo含量 价电子结构 组织形貌 润湿性 

分 类 号：TF12[冶金工程—粉末冶金]