超细蛇纹石粉的制备及其对水-乙二醇液压液摩擦学性能的影响

采用水热法制备超细蛇纹石粉，利用X射线衍射(XRD)和透射电子显微镜(TEM)对样品的晶体结构和形貌进行表征；究了不同反应温度所制备粉体及其添加量对68#水乙二醇液压液摩擦学性能的影响，初步探讨抗磨减摩机理。结果表明：不同温度下水热合成的蛇纹石的微观结构、化学组成及晶型各不相同；200 ℃以下水热合成的产物是利蛇纹石、水镁石等的混合物，200℃以上合成的产物为中空管状纳米纤蛇纹石；采用200 ℃下制备的纤蛇纹石作为润滑添加剂，在其加入量（w）为0.06%时，水乙二醇液压液的综合摩擦学性能最优，摩擦因数、磨斑直径分别为0.0562和0.39 mm，较基础液压液分别减小了18.07%和33.90%；蛇纹石粉加入到液压液中能起到填平犁沟、修复磨痕表面的作用，从而实现抗磨和减摩的目的。

PREPARATION OF SERPENTINE ULTRAFINE POWDER AND ITS EFFECT ON TRIBOLOGICAL PROPERTIES OF WATER-GLYCOL HYDRAULIC FLUID

Serpentine ultrafine powders were prepared by hydrothermal method, and the structure and morphology of the powder were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM) techniques. The effects of powders prepared at different reaction temperatures and their dosages on tribological properties of 68# water-glycol hydraulic fluid were studied by using four-ball tester, and the mechanism of anti-wear and friction reduction was discussed. The results showed that the microstructure, chemical composition and crystal form of the hydrothermally synthesized serpentine powder at different temperatures were different. The hydrothermal synthesis product below 200°C was a mixture of serpentine, brucite, etc., and the serpentine powder synthesized by hydrothermal method at 200°C or above 200°C was a hollow tubular nanofiber serpentine. When using the nano-fiber serpentine powders prepared at 200°C and the adding amount was 0.06 % of the mass of water-glycol hydraulic fluid, the comprehensive tribological performance of water-glycol hydraulic fluid was the best. The friction coefficient and the wear spot diameter were 0.0562 and 0.39 mm, respectively, which were 18.07% and 33.90% lower than those of the basic hydraulic fluid, respectively. The morphology and energy spectrum analysis showed that serpentine powder added to hydraulic fluid can fill furrowing and repair the surface of wear marks, so as to achieve anti-wear and anti-friction.