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利用球磨法将具有纤维束结构的一维纳米凹凸棒石粉体进行亚微米颗粒化改造.将亚微米颗粒化凹凸棒石粉体分散在长城牌柴油机润滑油CD 15W/40中,利用端面摩擦磨损试验和环-块摩擦磨损试验考察其减摩与自修复性能,并与未添加凹凸棒石粉体的CD 15W/40进行对比.借助XRD、SEM、TEM、EDX和XPS对试验样品进行了分析测试,并探讨了亚微米颗粒化凹凸棒石粉体对45#钢磨损表面的自修复机理.结果表明:高能球磨可以完成将纤维状的凹凸棒石粉体向颗粒状转变的过程,改造后的粉体物相组成为凹凸棒石和石英,粒度属于亚微米级;CD15W/40添加亚微米颗粒化凹凸棒石粉体后,其减摩性提升58.4%;与CD 15W/40润滑表面相比,加入亚微米颗粒化凹凸棒石粉体后,磨损表面光滑,没有明显犁沟、点蚀坑和表面材料塑性变形等现象;磨痕处存在与基体材料不同的修复区域,该修复区域沉积了O、Si、Fe等元素,说明亚微米颗粒化凹凸棒石粉体对45#钢具有优良的减摩性和自修复性能.
The one-dimensional nanocomposite attapulgite powder with fiber bundle structure was modified by ball milling to submicron particle modification.The submicron granulized attapulgite powder was dispersed in the Great Wall brand diesel engine lubricating oil CD 15W / 40, and the surface friction Wear test and ring-block friction and wear test were carried out to investigate the anti-friction and self-healing properties of CD 15W / 40 with no addition of attapulgite powder.The test samples were characterized by XRD, SEM, TEM, EDX and XPS Analysis and testing, and discussed the self-repairing mechanism of submicron granulation attapulgite powder on wear surface of 45 # steel.The results show that high-energy ball milling can complete the process of transforming fibrous attapulgite into granule, The powder phase composition was attapulgite and quartz with the particle size of submicrometer. The antifriction property of CD15W / 40 with submicron granulated attapulgite powder was increased by 58.4%. Compared with CD 15W / 40 lubricating surface phase Than the addition of submicron granulation attapulgite powder, the wear surface is smooth, there is no obvious furrows, pitting pits and plastic deformation of the surface material phenomena; the existence of wear scar and the matrix material different repair area, the repair area deposition O, Si , Fe and other elements, indicating sub-micron granulation attapulgite powder 45 # steel has excellent anti-friction and self-healing properties.