原位制备CaCO3微纳米流体及摩擦学性能研究

选用菜籽油、失水山梨糖醇脂肪酸酯(Span 80)、壬基酚聚氧乙烯醚(TX-7)、正丁醇制备W/O型微乳液，并将其作为微反应器原位合成CaCO₃微纳米粒子。对CaCO₃粒子形貌的表征表明，随含水量增加，CaCO₃粒子由球形转变为梭形薄片状，CaCO₃粒子尺寸也可受含水量控制。通过四球摩擦磨损试验机评价CaCO₃微纳米流体的摩擦学性能，结果表明，该微乳液体系相较于基础油的摩擦因数降低了约55.74%,CaCO₃粒子使微乳液P_B值提高了约10.88%,摩擦面粗糙度降低了约16.01%。在摩擦过程中，胶团在表面活性剂的作用下平行吸附于摩擦面且易于剪切，实现优异的减摩效果；梭形薄片状的CaCO₃微纳米粒子可以抑制表面微凸体之间的直接接触，减少黏着磨损与磨粒磨损，从而发挥极压作用并显著改善表面质量。

In-situ Synthesis of CaCO3 Micro-nanofluid and Its Tribological Properties

The W/O microemulsion was prepared using rapeseed oil,Span 80,TX-7 and butanol.CaCO3 micro-nano particles were in-situ synthesized by microemulsion as microreactor.The characterization of CaCO3 particles shows that the CaCO3 particles change from globular to fusiform with the increase of water content,and the size of CaCO3 particles can also be controlled by water content.The tribological behaviors of the CaCO3 micro-nanofluid were investigated by four-ball friction tester.The results show that the friction coefficient of the microemulsions is reduced by about 55.74% compared with the base oil,and the CaCO3 particles increase the maximum non seizure load of the micro-nanofluid by about 10.88% and reduces the roughness of the friction surface by about 16.01%.The laminar reversed micelle has small shear stress and is parallel adsorbed on the friction surface under the action of surfactant,so it has excellent antifriction effect in the process of friction.The fusiform lamelliform CaCO3 particles can isolate the direct contact between the asperities of the friction surface and reduce adhesive wear and abrasive wear.It can improve the surface quality of friction surface and the extreme pressure performance of the lubricant.