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镧/蛇纹石复合润滑材料的热力学及摩擦学性能

ISSN号：1673-0224
期刊名称：《粉末冶金材料科学与工程》
时间：0
分类：TG117.3[金属学及工艺—物理冶金;金属学及工艺—金属学]
作者机构：[1]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072, [2]上海交通大学上海市激光制造与材料改性重点实验室,上海200240
相关基金：国家自然科学基金资助项目（50735006,50805146,50904072）; 国家重点基础研究发展规划（973计划）资助项目（2007CB607601）; 博士后基金项目资助（20090461452）

作者：许一[1], 张保森[1,2], 徐滨士[1], 高飞[1], 史佩京[1], 张博[1]

关键词：稀土, 蛇纹石, 热力学, 磨擦磨损, 机理, rare earth, serpentine, thermodynamics, friction and wear, mechanism

中文摘要：

采用天然岫岩玉和人工合成含镧化合物为原料,通过高能球磨制备粒径小于2μm的镧/蛇纹石复合粉体,分析该复合粉体的热力学及结构稳定性,评价其作为润滑添加剂的摩擦学性能,并探索其减摩抗磨机理。结果表明：镧的加入能降低蛇纹石微粉的热力学及结构稳定性,使蛇纹石的羟基脱除速率更快、反应更彻底。复合微粉较单一的蛇纹石微粉具有更好的减摩抗磨性能,在CD15w/40柴油机润滑油中添加0.5%的镧/蛇纹石复合微粉时,摩擦因数和盘片磨损体积分别较基础油降低约34.2%和68.8%;磨损表面致密光滑,复合粉体颗粒直接参与摩擦界面复杂的物理和化学作用,诱发形成富含Si-O结构的氧化膜,该氧化膜与有机残留物产生正协同作用,提高摩擦副的磨损抗力及润滑性能,显著降低摩擦磨损。

英文摘要：

The lanthanum/serpentine composite powders（2 μm） were prepared out of the raw materials of rock-forming serpentine and synthetic La-containing compound by high-energy mechanical ball-milling method.The thermodynamic and structural stability of the as-prepared powders was analyzed.The tribological properties of the composite powders as lubricant additive were evaluated and the mechanism for reducing friction and wear was discussed.Results show that the addition of lanthanum can weaken the thermodynamic and structural stability of the serpentine powders and promote the dehydration reactions with higher rate and extent.The composite powders show more enhanced friction and wear reducing properties than the serpentine powders alone.The friction coefficient and wear volume of the disk decrease by 34.2% and 68.8% for the lubrication of the CD 15w/40 diesel engine oil with addition of 0.5%（mass fraction） lanthanum/serpentine composite powders,respectively,compared to those of the base oil.The worn surface shows smooth and compact,suggesting that the composite particles have participated in the physicochemical interactions at the friction interface and an induced layer of oxide enrichment in Si-O structures has formed,which improves the wear resistance and lubricating properties of the friction couples together with the residual organic compounds,and contributes to the significantly reduced friction and wear.

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