Mo_2FeB_2基新型硬质合金的制备  

PREPARATION OF Mo_2FeB_2 BASED NEW HARD ALLOYS

作　　者：曾鲜[1] 郭志猛[1] 刘祥庆[1] 石永亮[1] 陈文 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]莱芜市粉末冶金先进制造重点实验室,山东271100

出　　处：《粉末冶金工业》2013年第1期32-36,共5页Powder Metallurgy Industry

基　　金：国家自然科学基金委员会资助(No.50774010);广东省产学研结合项目"微(纳)米级晶粒硬质合金制品研发及产业化"(2009A090100014)

摘　　要：本文采用真空反应烧结法原位合成制备了Mo2FeB2基新型硬质合金,研究了Mo2FeB2基新型硬质合金及烧结温度和保温时间对合金组织和性能的影响。利用扫描电镜(SEM)和X射线衍射仪(XRD)对试样的组织和物相进行了分析,测定了试样的密度、抗弯强度(TRS)和硬度(HRA)。实验结果表明,提高烧结温度或延长保温时间都会导致合金中的Mo2FeB2颗粒形貌从近球形向长条形转变,导致抗弯强度降低。本实验烧结温度为1 270℃,保温0min时获得的硬质合金的组织和性能最佳,其抗弯强度为1 780MPa,硬度为86HRA。The Mo2FeB2 based hard alloy was prepared by vacuum reaction sintering. The effects of final sintering temperature and holding time on microstructure and mechanical property were investigated. Scanning electron microscopy （SEM） and X-ray diffraction （XRD） were used for characterization. Moreover, the transverse rupture strength （TRS） and hardness （HRA） were also measured, and attempts were made to relate them to the mi- crostructure development. The results indicate that increasing the final sintering temperature or prolonging the holding time lead to the change of Mo2 FeB2 grains shape from spherical to cubic which decrease the transverse rupture strength The best mechanical properties of Mo2FeB2 based hard alloy are obtained when the final sintering temperature is 1270℃ and holding time 0min i. e. transverse rupture strength of 1780Mpa, and hardness of 86HRA.

关 键 词：Mo2FeB2 硬质合金 反应烧结 微观组织 力学性能 

分 类 号：TF124.5[冶金工程—粉末冶金]