纳米SiO2对聚丙烯酸酯复合涂层在水润滑下摩擦学性能的影响

考察了纳米SiO₂对聚丙烯酸酯复合涂层在水润滑下摩擦磨损性能的影响。利用FTIR分析纳米SiO₂与聚丙烯酸酯的界面结合;利用SEM观察复合涂层磨损表面,并结合FTIR和摩擦磨损实验分析其磨损机理。结果表明:水润滑时,聚丙烯酸酯在摩擦过程中会发生摩擦化学反应,引起涂层摩擦腐蚀磨损;而纳米SiO₂能与聚丙烯酸酯以化学键的形式结合,它的加入有助于摩擦界面在水介质中形成具有较好减摩作用的表面膜和水分子膜,提高聚丙烯酸酯复合涂层的耐磨性。在水润滑下,当纳米SiO₂的含量较低时,涂层表面的磨损形式为摩擦腐蚀磨损和磨粒磨损;当纳米SiO₂的含量达到5wt% 时,涂层表面形成完整的表面膜和水分子膜,此时涂层具有良好的摩擦学性能。 

EFFECT OF NANOMETER SiO2 PARTICLES ON THE FRICTION AND WEAR PROPERTIES OF POLYACRYLATE COATINGS UNDER WATER LUBRICATION

The tribological properties of polyacrylate coatings modified by nanometer SiO_2 particles were investigated under water lubrication. The interfacial coalescence between nano-SiO_2 and acrylic resin polymer was characterized by FTIR spectra. SEM was used to characterize the surface abrasion, and the wear mechanism was discussed by assistance of FTIR and abrasion experiments. The results show that chemical bonds exist between SiO_2 and polyacrylate, and the addition of nanometer SiO_2 particles helps to form a lubricating membrane and absorbed water layer under water lubrication, which improves the friction-reduction performance. When the amount of nano-silica is low, the main wear mechanisms of coatings are tribocorrosion abrasion and grain abrasion. As the coating contains 5wt% nanometer SiO_2, the favorable wear-resistance of the coating is obtained, which provides an integrated lubricating membrane and absorbed water layer.