铁含量对钒钛铁精矿原位合成铁基摩擦材料的影响

发布时间：2018-05-14 20:22

本文选题：钒钛铁精矿 + 原位合成　；参考：《热加工工艺》2017年22期

【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。
[Abstract]:Iron based friction materials were prepared by in-situ carbothermal reaction and sintering under vacuum conditions using vanadium iron concentrate and graphite as raw materials. The microstructure, relative density, hardness and friction coefficient of iron based friction materials were studied. The effects of wear rate, thermal conductivity and compression strength. The results show that Fe based friction materials with good properties can be prepared by using vanadium titanic iron concentrate. With the increase of iron content, the porosity of the material decreases gradually, and the lamellar pearlite in the microstructure of the material increases first and then weakens. The relative density, Brinell hardness, thermal conductivity and compressive strength of the materials increase with the increase of iron content. However, for the wear rate, the wear rate increases from 2.27 脳 10~(-7)cm~3/J to 3.82 脳 10 ~ (-7) cm ~ (-1) 路m ~ (-1) when the iron content increases from 66wt% to 78wt%. When the iron content increased to 82 wt%, the wear rate decreased rapidly to 1.06 脳 10 ~ (-1) ~ (-7) cm ~ (-1) 路m ~ (-1) 路m ~ (-1). Generally speaking, when the iron content is within 70 wt% and 74 wt%, the iron-based friction materials have moderate friction coefficient, wear rate and thermal conductivity.
【作者单位】：四川工程职业技术学院材料工程系;四川大学制造科学与工程学院;
【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)
【分类号】：TB39

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