石墨对钒钛铁精矿原位制备铁基摩擦材料的影响  

Effect of graphite content on Fe-based friction material prepared by in-situ carbothermic reduction and synthesis from vanadium and titanium iron concentrate

作　　者：岳慧芳[1] 冯可芹[1] 李莹[1] 张光明[1,2] 

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

出　　处：《材料热处理学报》2015年第10期16-21,共6页Transactions of Materials and Heat Treatment

基　　金：四川省科技支撑计划(2012GZX0089);攀枝花市级应用技术研究与开发资金计划(2012CY-C-1)

摘　　要：在真空条件下以钒钛铁精矿为原料原位碳热还原烧结制备铁基摩擦材料,研究石墨含量对铁基摩擦材料显微组织、硬度、摩擦性能以及磨损形貌的影响。结果表明,利用钒钛铁精矿可制备出性能优良的铁基摩擦材料;少量石墨促进烧结过程,石墨含量为5%时,材料组织最致密,且孔隙趋于球形,过量石墨阻碍烧结颈的形成,割裂基体;当石墨含量从3%增加到7%时,材料硬度降低约36%,摩擦系数降低约25%,材料的磨损机制由粘着磨损和轻微的磨粒磨损转变为石墨自润滑磨粒磨损,最后转变为犁削磨损;适当的石墨含量和孔隙度能有效降低磨损率,石墨含量为6%时耐磨性最好,其磨损率为2.00×10-7cm3/J。Effects of graphite content on microstructure,hardness,friction and wear performance of Fe-based friction material were investigated,which was prepared from in-situ carbothermic reduction and vacuum sintering technology,using vanadium and titanium iron concentrate as the raw material. The results show that the Fe-based friction material prepared from vanadium and titanium iron concentrate exhibits excellent properties. Low graphite content promotes sintering,while higher content hinders sintered neck formation and splits metal matrix. When the graphite content is 5%,the most compact microstructure and spherical pores are obtained. When the graphite content increases from 3% to 7%,the hardness and friction coefficient decrease by 36% and 25%,respectively. In addition,the wear mechanism changes from adhesive abrasion and slight abrasive wear to abrasive wear with graphite self-lubrication,finally to ploughing wear. The appropriate graphite content and porosity can effectively decrease the wear rate. The lowest volume abrasion rate（ 2. 00 × 10-7cm3/ J） is obtained when the graphite content is 6%.

关 键 词：铁基摩擦材料 钒钛铁精矿 原位还原 石墨 

分 类 号：TB36[一般工业技术—材料科学与工程]