氧化铝/石墨-硫酸钡层状复合材料的摩擦学性能及润滑机理

将石墨和硫酸钡按一定比例复合作为弱界面层，通过铺层-冷压-放电等离子烧结工艺制备了Al2O3/Graphite-BaSO4层状复合材料. 考察了复配润滑剂的组分对层状复合陶瓷在室温至800 ℃连续加热过程中自润滑性能的影响规律，并通过磨损表面分析探讨了其在宽温域下的协同润滑机制. 结果表明：通过复配在室温和中高温度段具有优异自润滑性能的固体润滑剂，并借助仿贝壳材料独特的层状结构特征，可有效改善氧化铝陶瓷在不同温度段的摩擦学性能，进而实现材料在较宽温度范围内的连续润滑. 基于润滑相组分优化的复合材料在室温至800 ℃温度范围内与Al2O3栓对摩时的摩擦系数可保持在0.28~0.48之间，比块体Al2O3陶瓷/Al2O3栓摩擦副的摩擦系数降低了近60%.Graphite and barium sulfate were compounded in a specific ratio to act as a weak interlayer. The Al₂O₃/Graphite-BaSO₄ layered composite was fabricated via the layering-cold pressing-discharge plasma sintering process. The effect of the composition of compounded solid lubricants on the self-lubricating performance of the layered composite ceramics during continuous heating from room temperature to 800 ℃ was systematically investigated. Furthermore, the synergistic lubrication mechanism across a wide temperature range was explored through worn surface analysis. The results show that by compounding solid lubricants with excellent self-lubricating properties at room temperature and medium-high temperature ranges, and leveraging the unique layered structural characteristics of nacre-inspired materials, the tribological performance of alumina ceramics at different temperature stages can be effectively improved, thus achieving continuous lubrication of the material over a wide temperature range. The composite optimized based on the lubricating phase composition maintains a friction coefficient between 0.28 and 0.48 when sliding against an Al₂O₃ pin within the temperature range of room temperature to 800 ℃, which is nearly 60% lower than that of the bulk Al₂O₃ ceramic/Al₂O₃ pin friction pair.

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背景概述

该数据集聚焦于氧化铝/石墨-硫酸钡层状复合材料的摩擦学性能与润滑机理研究。通过制备仿贝壳结构的层状复合材料，系统考察了其在室温至800℃宽温域下的自润滑行为，揭示了复配润滑剂组分对摩擦系数降低近60%的优化效果，并探讨了协同润滑机制，旨在实现材料在较宽温度范围内的连续润滑和耐磨损性能提升。