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为了研究阳极氧化铝膜的多孔结构对其润滑性能的影响,分别制备了光滑表面氧化铝膜,40 nm孔径、90 nm孔径多孔表面氧化铝膜。用接触角测试仪测试了水、机油与3种表面的接触角;在不同润滑条件下,用摩擦磨损试验机UMT-2测试了3种氧化铝膜与GCr15钢面接触的润滑性能.结果表明:多孔结构氧化铝膜增强了材料的亲水性能和亲油性能,90 nm孔径氧化铝膜表现出超亲油特征;水润滑和机油润滑条件下,速度从0.016 m/s增至0.32 m/s过程中,光滑氧化铝表面只能形成边界润滑区域,多孔表面得到了包含边界润滑、混合润滑和流体润滑的完整的Stibeck曲线.机油润滑条件下,40 nm孔径的膜达到最小摩擦系数的临界速度为0.28 m/s,最小摩擦系数为0.083,90 nm孔径的膜达到最小摩擦系数的临界速度仅为0.2 m/s,最小摩擦系数减小为0.023;机油润滑条件下,90 nm孔径的氧化铝膜板的Stribeck曲线,谷底区域更宽.
In order to study the influence of the porous structure of the anodic aluminum oxide on the lubricity, a smooth surface aluminum oxide film, a 40 nm pore size and a 90 nm pore size porous alumina membrane were prepared respectively. The contact angles of water and oil with three kinds of surfaces were tested by the contact angle tester. The lubricity of three kinds of alumina films and GCr15 steel surfaces were tested under different lubrication conditions by using the tribological tester UMT-2. The results show that : The porous alumina membrane can enhance the hydrophilicity and lipophilicity of the materials. The 90 nm pore size alumina membrane shows super-lipophilic characteristics. Under water lubrication and oil lubrication, the velocity increases from 0.016 m / s to 0.32 m / s In the process, the smooth alumina surface can only form the boundary lubrication area, and the complete surface Stibéck curve with boundary lubrication, mixed lubrication and fluid lubrication is obtained on the porous surface.The film with 40 nm aperture reaches the minimum critical friction coefficient under oil lubrication condition 0.28 m / s, the minimum friction coefficient of 0.083,90 nm aperture membrane to achieve the minimum friction coefficient of the critical speed of only 0.2 m / s, the minimum friction coefficient decreases to 0.023; oil lubrication conditions, 90 nm aperture alumina The Stribeck curve of the diaphragm has a wider valley bottom.