石墨烯和氧化石墨烯水基润滑添加剂在镁合金冷轧中的摩擦学行为EI北大核心CSCD

选用石墨烯和氧化石墨烯作为水基润滑添加剂,对比研究两种纳米材料对AZ31镁合金在冷轧过程中的摩擦学性能的影响。采用场发射扫描电镜(FESEM)和拉曼光谱仪(Raman)对石墨烯和氧化石墨烯水基润滑液润滑条件下轧后板材表面形貌和成分进行了分析,探讨了石墨烯和氧化石墨烯作为水基润滑添加剂的润滑机理。结果表明,石墨烯和氧化石墨烯在水中最优含量为0.5%(质量分数),摩擦因数分别为0.132和0.038,磨损体积分别为23.1 mm^3和2.59 mm^3。同时氧化石墨烯水基润滑液优良的润滑性能降低了镁合金轧制过程中的轧制力,改善了轧后板材表面质量。相同测试条件下,氧化石墨烯水基润滑液的润滑性能优于石墨烯水基润滑液,主要原因是其在水中良好的分散性和在镁合金表面优异的润湿性。

Tribological behaviors of graphene and graphene oxide as water-based lubricant additives for magnesium alloy cold rolling

The tribological properties of garaphene and graphene oxide(GO) as water based additives were investigated for AZ31 Magnesium alloy cold rolling. The morphology and composition of surfaces were characterized by field emission scanning electron microscopy(FESEM) and Raman spectrum. The lubricating mechanism of graphene and graphene oxide(GO) as water-based additives was explored. The results indicate that the best tribological response of the magnesium alloy/steel pairs evaluated is obtained when GO and graphene at a concentration of 0.5%(mass fraction) is added to water. The friction coefficients of graphene nanofluids and GO nanofluids are 0.132 and 0.038, and the wear volumes are 23.1 mm^3 and 2.59 mm^3. Furthermore, the cold-rolling tests show that the application of GO nanofluids leads to a significant reduction in the rolling force and an improvement in the surface quality of sheets. Under the same testing conditions, the lubricating performance of GO nanofluids are superior to graphene nanofluids, which attributes to the superior dispersion in the water and prominent wetting of the GO nanofluids on the magnesium alloy surface.