水凝胶/热塑性聚氨酯复合材料在水润滑条件下的摩擦学性能

为提高水润滑轴承的承载能力,利用水凝胶在水润滑条件下的水合作用来改善热塑性聚氨酯（TPU）轴承材料的摩擦学性能。利用聚乙烯醇、海藻酸钠、壳聚糖等材料制备水凝胶颗粒,并通过熔融共混法制备水凝胶/TPU复合材料;在0.3和0.5 MPa的载荷下测试复合材料的摩擦磨损性能,利用激光干涉表面轮廓仪和扫描电子显微镜观察其磨损表面形貌,分析其磨损机制。结果表明：水凝胶微粒可以通过水合润滑改善摩擦副的润滑条件,从而降低摩擦因数和磨损量,提高复合材料的摩擦性能;水凝胶质量分数4%时复合材料具有最佳的摩擦磨损性能,其在0.3和0.5 MPa工况下相对于TPU试样的平均摩擦因数减少率分别为52.31%和43.94%。研究结果为开发高性能水润滑轴承材料提供了一种方法。

Friction and Wear of Hydrogel/Thermoplastic Polyurethane Composites under Water Lubrication

In order to improve the bearing capacity of water-lubricated bearings,the tribological properties of thermoplastic polyurethane (TPU) bearing materials were improved by the hydration of hydrogels under water lubrication conditions.Hydrogel particles were prepared by using polyvinyl alcohol,sodium alginate,chitosan and other materials,and hydrogel/TPU composites were prepared by melt blending.The friction and wear properties of the composites were tested under loads of 0.3 MPa and 0.5 MPa.The wear surface morphology was observed by laser interference surface profiler and scanning electron microscope,and the wear mechanism was analyzed.The results show that the hydrogel particles can improve the lubrication condition of the friction pair through hydration lubrication,thereby reducing the friction coefficient and wear amount,and improving the friction performance of the composite.When the mass fraction of hydrogel is 4%,the composite has the best friction and wear properties,and compared with the TPU sample,the average friction coefficient reduction rate under the working conditions of 0.3 MPa and 0.5 MPa is 52.31% and 43.94%,respectively.This research provides a method for developing high performance materials for water lubricated bearings.