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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。
The iron-based friction material was prepared by in situ carbothermal reduction sintering of vanadium-titanium iron ore concentrate under vacuum condition. The effects of graphite content on the microstructure, hardness, frictional properties and wear morphology of the iron-based friction material were studied. The results show that the iron-based friction material with excellent performance can be prepared by using vanadium-titanium-iron concentrate. A small amount of graphite can promote the sintering process. When the content of graphite is 5%, the material structure is the most compact and the pores tend to be spherical. Forming and splitting the matrix. When the content of graphite increased from 3% to 7%, the hardness of the material decreased about 36% and the friction coefficient decreased about 25%. The wear mechanism of the material changed from adhesive wear and slight abrasive wear to graphite self-lubricating wear At last, the wear rate of the graphite is 6%, the wear rate is 2.00 × 10-7cm3 / J.