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采用原位复合法制备聚乙烯醇水凝胶(PVA-H),采用模板-滤取法制备多孔超高分子量聚乙烯(UHMWPE)材料,对比研究了这2种材料在相同条件下的摩擦磨损性能,通过改变试验转速和载荷获得Stribeck曲线,并对其润滑机理进行分析.结果表明:干摩擦条件下,多孔UHMWPE和PVA-H的摩擦系数和磨损量均较大;在水润滑和牛血清润滑条件下,二者的摩擦磨损性能均得以改善,且PVA-H具有更低的磨损量.Stribeck曲线分析表明:仿生UHMWPE具有的多孔结构使得在其一定的区域内可以形成混合润滑区域;PVA-H具有更好的亲水性能和多孔结构,对应的Stribeck曲线谷底较宽,能够形成较宽的混合润滑区域和流体润滑区域,从而降低了接触区域的磨损量.
Polyvinyl alcohol hydrogel (PVA-H) was prepared by in situ composite method, and the UHMWPE material was prepared by the template-filter method. The friction and wear properties of the two materials were compared under the same conditions , The Stribeck curve was obtained by changing the test speed and load, and the lubrication mechanism was analyzed. The results showed that the friction coefficient and wear amount of porous UHMWPE and PVA-H were both higher under dry friction conditions; , The friction and wear properties of both were improved and the PVA-H had a lower wear.Stribeck curve analysis showed that the porous structure of the bionic UHMWPE made it possible to form a mixed lubrication zone in a certain area; PVA-H With better hydrophilic property and porous structure, the corresponding Stribeck curve has a wide bottom, which can form a wide range of mixed lubrication area and fluid lubrication area, thus reducing the wear of the contact area.