新型自润滑模具材料的制备和高温性能研究  

Preparation and high temperature properties of new self-lubricating die materials

作　　者：刘清阳 王华君[1] 周春杨 姚振华 燕松山[2] LIU Qing-yang;WANG Hua-jun;ZHOU Chun-yang;YAO Zhen-hua;YAN Song-shan(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;School of Mechanical and Electrical Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070 [2]武汉理工大学机电工程学院,武汉430070

出　　处：《粉末冶金技术》2020年第1期51-58,共8页Powder Metallurgy Technology

基　　金：武汉理工大学优秀学位论文培育资助项目(2017-YS-006)

摘　　要：以铁镍基合金为基体,添加硬质相Cr2O3及固体润滑剂CaF2,利用粉末冶金工艺制备了高温自润滑热锻模具材料。采用X射线衍射仪、扫描电子显微镜及显微硬度计,研究了烧结工艺对铁镍基自润滑材料力学性能的影响,分析了Cr2O3和CaF2对铁镍基自润滑材料烧结性能的影响,并得到了最佳烧结工艺。结果表明:当烧结工艺为1320℃、保温2 h时,制备得到的铁镍基自润滑材料力学性能优越;硬质相Cr2O3质量分数从0增加到30%,试样相对密度下降4.0%,硬度从HV227.3增加到HV 342.8;固体润滑剂CaF2质量分数从0增加到10%,试样相对密度和硬度均下降;通过600℃摩擦磨损实验发现,随CaF2质量分数的增加,试样摩擦系数和磨损率先降低后升高;当添加质量分数20%Cr2O3和8%CaF2时,自润滑模具材料的综合性能最佳。A new high-temperature self-lubricating die materials was prepared by powder metallurgy using Fe-Ni alloy as the base materials, Cr2O3 as the hard phase, and CaF2 as the solid lubricant. The effects of sintering process on the mechanical properties of Fe-Ni-based self-lubricating materials were investigated by X-ray diffractometer, scanning electron microscope, and microhardness tester, the influences of Cr2O3 and Ca F2 on the sintering properties of the self-lubricating materials were studied, and the optimum sintering process was obtained. The results show that, the self-lubricating materials sintered at 1320 ℃ for 2 h exhibit the excellent mechanical properties. When the content of Cr2O3 by mass increases from 0 to 30%, the relative density of the sample decreases by 4.0%, and the hardness increases from HV 227.3 to HV 342.8. When the content of CaF2 by mass increases from 0 to 10%, the relative density and hardness of the sample gradually decrease. With the increase of CaF2 content by mass in the friction and wear test at 600 ℃, the friction coefficient and wear rate decrease first and then increase. The self-lubricating die materials show the best combination performances as the Cr2O3 content of 20% and the CaF2 content of 8% by mass.

关 键 词：粉末冶金工艺 自润滑材料 烧结工艺 摩擦 磨损 

分 类 号：TG76[金属学及工艺—刀具与模具]