羟基硅酸镁在润滑领域的应用研究进展

针对国内外关于羟基硅酸镁纳米微粒在润滑领域的研究报道进行了详细综述。首先，从羟基硅酸镁的结构特点入手，介绍了其在摩擦学领域的应用，然后列举了羟基硅酸镁纳米微粒的制备方法，总结了化学方法合成羟基硅酸镁纳米微粒过程中的不同反应条件，以及对其形貌调控的影响作用。其次，针对改善羟基硅酸镁在润滑油中的分散稳定性而采用的方法进行了概括。随后讨论了羟基硅酸镁纳米微粒在不同摩擦参数、摩擦对偶以及与稀土元素杂化的摩擦学性能变化规律，分析了其在摩擦副表面的摩擦膜形成机制与作用机理。在已报道的文献基础上，归纳总结了羟基硅酸镁纳米微粒能够产生抗磨减摩性能的潜在润滑机制。最后，提出了未来羟基硅酸镁纳米微粒在润滑领域应用推广所面临的问题与挑战，并针对已有问题给出了相应的解决思路。

Research Progress on the Application of Magnesium Silicate Hydroxide in the Field of Lubrication

The work aims to review the relevant research reports on magnesium silicate hydroxide in the field of lubrication inChina and abroad in detail. Then, two commonly used preparation methods of magnesium silicate hydroxide nanoparticles are listed, explaining the rationality, advantages and disadvantages of each method. The chemical methods for the synthesis of magnesium silicate hydroxide nanoparticles are highlighted. The effects of different reaction conditions (pH value, molar ratio:Si/Mg, temperature and holding time) on the morphology control were explored. It was found that with the increase of pH, temperature and holding time, the morphology of magnesium silicate hydroxide changed from flake/flower to tubular/fibrous. Secondly, the methods used to improve the dispersion stability of magnesium silicate hydroxide in lubricating oil were summarized. Specifically, it included:surfactant based on oleic acid.Through the carboxyl functional group at its end and the hydroxyl functional group on the surface of magnesium silicate hydroxide, with the physical action of van der Waals force and hydrogen bonding, it was coated on the surface of nanoparticles. The hydroxyl group that can be further reacted and the surfactant with hydroxyl or carboxyl group are selected, and the long organic chain is introduced on the surface through condensation reaction or esterification reaction and hybridization with other substances, etc. Then, the changing rules of the tribological properties of magnesium silicate hydroxide nanoparticles under different friction parameters, special matching pairs and hybridization with rare earth elements are discussed. The formation mechanism and action mechanism of the tribofilm of magnesium silicate hydroxide on the surface of the friction pair are analyzed. Based on the reported literature, the potential lubricating mechanism (surface repair effect, tribochemical reaction film, microstructural transformation, synergistic effect and internal oxidation mechanism) of magnesium silicate hydroxide nanoparticles for anti-wear and anti-friction properties is summarized. Finally, the problems and challenges in the application and popularization of magnesium hydroxy silicate nanoparticles in the field of lubrication in the future are put forward. The corresponding solutions are given for the existing problems.