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首页> 外文期刊>RSC Advances >Effects of rare-earth oxides on the microstructure and properties of Fe-based friction materials synthesized by in situ carbothermic reaction from vanadium-bearing titanomagnetite concentrates
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Effects of rare-earth oxides on the microstructure and properties of Fe-based friction materials synthesized by in situ carbothermic reaction from vanadium-bearing titanomagnetite concentrates

机译：稀土氧化物对由钒钛镁镁矿浓缩物原位碳热反应合成的Fe基摩擦材料的微观结构和性能

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In this work, we prepared an iron-based frictional material from vanadium-bearing titanomagnetite concentrates by in situ carbothermic reaction with improved tribological properties. Effects of different amounts of rare-earth oxides on the microstructure and properties of the Fe-based friction materials were investigated. The microstructure of the Fe-based friction material consisted of an Fe matrix, hard particles (mainly TiC) and a lubricating phase (graphite). The moderate addition of rare-earth oxides improved the microstructure and properties of the Fe-based friction material significantly. Particularly, the friction coefficient decreased from 0.61 to 0.48–0.56 and the wear rate reduced from 7.8 × 10 ~(?7) cm ~(3) J ~(?1) to 2.6 × 10 ~(?7) ～4.9 × 10 ~(?7) cm ~(3) J ~(?1) . Addition of La _(2) O _(3) (≤0.2 wt%) or CeO _(2) (≤0.4 wt%) contributed to sintering densification and improved the relative density, hardness and wear resistance. The dominant wear mechanism changes from severe abrasive wear and oxidative wear to mild oxidative wear. However, when rare-earth oxide addition was increased further, the microstructure, relative density, hardness, and wear performance of the Fe-based friction materials deteriorated. Consequently, the optimal additions of La _(2) O _(3) and CeO _(2) were 0.2 wt% and 0.4 wt%, respectively.
机译：在这项工作中，我们制备了含有钒钛镁镁镁石浓缩物的铁基摩擦材料，通过原位碳热反应与改善的摩擦学性能。研究了不同量的稀土氧化物对Fe基摩擦材料的微观结构和性质的影响。 Fe基摩擦材料的微观结构由Fe基质，硬质颗粒（主要是TiC）和润滑相（石墨）组成。稀土氧化物的温和加入显着提高了Fe基摩擦材料的微观结构和性能。特别是，摩擦系数从0.61降低到0.48-0.56，磨损率从7.8×10〜（？7）cm〜（3）j〜（Δ1）降至2.6×10〜（？7）〜4.9×10 〜（？7）cm〜（3）j〜（？1）。添加La _（2）O _（3）（≤0.2wt％）或CEO _（2）（≤0.4wt％）导致烧结致密化并改善相对密度，硬度和耐磨性。主要的磨损机制从严重的磨料磨损和氧化磨损变为温和的氧化磨损。然而，当进一步增加稀土氧化物添加时，Fe基摩擦材料的微观结构，相对密度，硬度和磨损性能劣化。因此，La _（2）O _（3）和CeO _（2）的最佳添加分别为0.2wt％和0.4wt％。

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