烧结工艺和碳加入量对Mo_2FeB_2基金属陶瓷显微组织和力学性能的影响  

Effects of Sintering Technique and Amount of Carbon Addition on Microstructure and Mechanical Properties of Mo_2FeB_2 Based Cermets

作　　者：郑建智[1] 承新[1] 郑勇[1] 严永林[1] 赵能伟[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《机械工程材料》2009年第3期31-34,38,共5页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(50674057);湖北省耐火材料与高温陶瓷重点实验室-省部共建国家重点实验室培育基地开放基金资助项目(G0505)

摘　　要：采用反应烧结法制备了Mo_2FeB_2基金属陶瓷,用扫描电镜、能谱仪及X射线衍射仪等手段研究了烧结工艺和碳加入量对其显微组织和力学性能的影响。结果表明:随着碳加入量的增大,金属陶瓷的硬度和抗弯强度均先增大再减小;当添加0.5%的碳时,在1100℃保温60 min并最终在1 280℃烧结60 min,能够获得完全致密且力学性能较好的Mo_2FeB_2基金属陶瓷,其抗弯强度达到1176 MPa。The Mo2FeB2 based cermets were prepared by reaction sintering method. The effects of sintering technique and amount of carbon addition on microstructure and mechanical properties of the Mo2FeB2 based cermets were studied by scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDS） and X-ray diffraction （XRD）. The results show that with the increase of carbon addition, hardness and flexural strength of the cermets both first increased and then decreased. Mo2FeB2 based cermets with complete density and good mechanical properties could be obtained when the amount of carbon addition was 0. 5wt%, soaked at 1 100 ℃ for 60 rain and subsequently sintered at 1 280 ℃for 60 min. The flexural strength could reach to 1 176 MPa.

关 键 词：MO2FEB2基金属陶瓷 烧结工艺 碳加入量 

分 类 号：TG146.1[一般工业技术—材料科学与工程]