[目的]为了提高球墨铸铁表面的耐摩擦磨损性能，考察了织构化球墨铸铁表面喷涂纯PTFE及以PTFE为主要原材料的复合涂层后的摩擦磨损行为。[方法]采用激光连续扫描的方式在球墨铸铁表面原位诱导生成不规则微织构阵列，并喷涂PTFE涂层和含有氧化铝纳米颗粒等材料的PTFE复合涂层。通过对表面硬度、磨损形貌、摩擦因数、磨损率、摩擦深度等方面的测试，探究球墨铸铁表面复合微织构在干摩擦下的摩擦行为及磨损机理。[结果]氧化铝/PTFE复合涂层较PTFE涂层具有更高的硬度和耐磨性，形成了更耐磨的润滑层。微织构能够储存一定量的涂层材料，在基体与摩擦副持续摩擦的过程中缓慢释放出涂层材料，对表面起到进一步的减摩作用。氧化铝复合涂层和微织构同时对球墨铸铁起到减摩抗磨的作用。相比于无织构的球墨铸铁试样，复合涂层微织构试样在平均摩擦因数和摩擦副磨损率方面分别减小了77%和88%，磨损形貌也大有改善，表面划痕小，只出现轻微的犁沟现象。[结论]表面微织构化及涂覆含氧化铝的PTFE纳米复合涂层可赋予球墨铸铁在干摩擦条件下优异的减摩抗磨性能。

[Objective] To improve the friction and wear resistance of ductile cast iron, the tribological behavior of pure PTFE(polytetrafluoroethylene) and PTFE-based composite coating applied on textured surface of ductile cast iron was studied. [Method] Irregular micro-textured arrays were fabricated in-situ on the surface of ductile cast iron via continuous laser scanning, followed by spraying with pure PTFE and PTFE-based composite coating containing alumina and other reinforcing materials. The tribological behavior and mechanism of the micro-textured ductile cast iron with composite coating under dry friction condition were examined in terms of surface hardness, wear morphology, friction coefficient, wear rate, and wear depth. [Result] The alumina/PTFE composite coating exhibits higher hardness and wear resistance than pure PTFE coating, forming a more wear-resistant lubricating layer. The micro-textures acted as reservoirs for coating material, and enabled gradual release of coating material when the substrate came into contact with the friction pair, providing further lubrication. Both the alumina-containing composite coating and microtexture play a role in reducing friction and wear on ductile cast iron surface. Compared with the untextured ductile cast iron, the microtextured specimen with the composite coating showed a 77% reduction in average friction coefficient and an 88% reduction in friction pair wear rate. The wear morphology also exhibited significant improvement, with shallow scratches and minimal plowing grooves. [Conclusion] Surface micro-texturing coupled with alumina/PTFE nanocomposite coating endows ductile cast iron with exceptional friction-reducing and anti-wear properties under dry sliding conditions.