The limited wear resistance of aluminum alloys constrained their applications and longevity. Surface microtexture combined with polymer coating technology can prolong the service life of aluminum alloy materials under extreme conditions of aerospace. A370 aluminum specimens were textured with three types of microtexture surfaces including circular pits, rectangular grooves and cross grids. A PI/EP-PTFE/WS coating was designed and prepared on the surfaces of these textures by liquid spraying to improve the tribological properties of A370 aluminum under tarved oil and dry sliding wear. The influences of different micro-texture morphology on the tribological performances of these coatings were experimented. The results indicated that the surface qualities of the micro-textures are improved by coating deposition on their surfaces. The friction coefficients of the coated surfaces on all micro-texture are effectively reduced under the relatively stable wear stage compared to the sample without micro-texture coating. The coating on the pitted texture exhibits superior performance in friction tests, reducing average coefficients and wear rate by 13.58% and 35.34% in dry sliding wear, and by 16.18% and 83.98% under the starved oil lubrication compared to the non-textured substrate, respectively. This is followed by the coating on cross-mesh texture and the rectangular groove texture. The reason is that the pitted texture facilitates the local stress release of coating during the process of coating deposition due to its smaller spacing between pits and higher density of pits per unit area. The bearing capacity of the pitted texture is highest and its deformation is the lowest. The wear debris created in the friction process is more easily accumulated in the pit units, which results in a reduction in wear.

中文翻译：

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缺油干滑动磨损下显微组织形貌对PI/EP-PTFE-WS2涂层摩擦学性能的影响

铝合金有限的耐磨性限制了其应用和寿命。表面微织构结合聚合物涂层技术，可以延长铝合金材料在航空航天极端条件下的使用寿命。 A370 铝样品具有三种类型的微纹理表面，包括圆形凹坑、矩形凹槽和十字网格。通过液体喷涂在这些纹理的表面设计并制备了 PI/EP-PTFE/WS 涂层，以改善 A370 铝在焦油和干滑动磨损下的摩擦学性能。实验了不同微观织构形态对这些涂层摩擦学性能的影响。结果表明，通过在其表面沉积涂层，可以改善微纹理的表面质量。与没有微纹理涂层的样品相比，在相对稳定的磨损阶段，所有微纹理涂层表面的摩擦系数均得到有效降低。麻点纹理涂层在摩擦测试中表现出优越的性能，与无纹理基材相比，干滑动磨损时平均系数和磨损率分别降低了13.58%和35.34%，缺油润滑时平均系数和磨损率分别降低了16.18%和83.98%。分别。接下来是十字网格纹理和矩形凹槽纹理的涂层。其原因在于，麻点织构因其麻点间距较小、单位面积麻点密度较高，有利于涂层沉积过程中涂层局部应力的释放。麻点纹理的承载能力最高，变形最小。摩擦过程中产生的磨屑更容易积聚在凹坑单元中，从而减少磨损。