铁含量对钒钛铁精矿原位合成铁基摩擦材料的影响  

Effects of Iron Content on Iron-based Friction Material In-situ Synthesized from Vanadium-bearing Titanomagnetite Concentrates

作　　者：张光明[1] 冯可芹[2] 岳慧芳[2] 蔺虹宾[1] 

机构地区：[1]四川工程职业技术学院材料工程系,四川德阳618000 [2]四川大学制造科学与工程学院,四川成都610065

出　　处：《热加工工艺》2017年第22期100-104,108,共6页Hot Working Technology

基　　金：四川省科技支撑计划项目(2012GZX0089);德阳市科技支撑计划项目(2013ZZ073-08)

摘　　要：以钒钛铁精矿和石墨为原料,在真空条件下采用原位碳热反应加烧结工艺制备了铁基摩擦材料,研究了铁含量(66wt%~82wt%)对铁基摩擦材料微观组织、相对密度、硬度、摩擦系数、磨损率、导热系数和压缩强度等性能的影响。结果表明:利用钒钛铁精矿可制备出性能良好的铁基摩擦材料。随铁含量增加,材料孔隙率逐渐减小,材料微观组织里出现层片状珠光体的趋势先增强后减弱。材料相对密度、布氏硬度、导热系数和压缩强度均随铁含量的增加而增大,但对磨损率而言,当铁含量从66wt%增加到78wt%时,磨损率从2.27×10^(-7)cm^3/J逐渐增大到3.82×10^(-7 )cm^3/J。当铁含量再增大到82wt%时,磨损率反而快速降低至1.06×10^(-7)cm^3/J。综合来看,当铁含量在70wt%~74wt%内时制备的铁基摩擦材料有较适中的摩擦系数、磨损率和导热系数。The iron,based friction material was prepared by in-situ carbothermic reaction and sintering process in vacuum condition taking vanadium-bearing titanomagnetite concentrates and graphite as raw materials. The effects of iron content （66 wt%-82wt% ） on the microstructure, relative density, hardness, friction coefficient, wear rate, thermal conductivity and compression strength of the material were investigated. The results indicate that iron-based friction material with appropriate properties can be directly prepared from vanadium-bearing titanomagnetite concentrates. With the increase of Fe content, the porosity of the material decreases gradually and the trend of the appearance of pearlite in laminated microstructure increases firstly and then decreases. The relative density, Brinell hardness, thermal conductivity and compression strength of the material increase with the increase of Fe content. But for the wear rate, when iron content increases from 66wt% to 78wt%, the wear rate increases from 2.27×10^-7 cm^3/J to 3.82×10^-7 cm3/J. When the iron content continue increases to 82wt%, the wear rate, on the contrary, decreases sharply to 1.06×10^-7/J. Generally, when the iron content is 70wt%-74wt%, the prepared iron-based friction material in this case has an appropriate friction coefficient, wear rate and thermal conductivity.

关 键 词：钒钛铁精矿 原位合成 铁含量 铁基摩擦材料 

分 类 号：TF125.32[冶金工程—粉末冶金]