Magnesium silicate hydroxide (hydrated magnesium silicate, MSH) nanoparticles with different sizes and morphologies were prepared. The equivalent diameter (D_e) was introduced to transform morphology difference into size difference. The tribological tests showed that the anti-wear property of nanoparticles is highly related to the D_e and the oil film thickness. When the centre oil film thickness (h_c) exceeds the D_e of all powders added, the wear reduction rates of powders with different D_e are concentrated in the range of 55%–61%. However, when the h_c decreased, the different powders show a great difference in anti-wear performance, which is due to the relatively larger D_e that would affect the action of nanoparticles entering into the friction contact area, thereby week its anti-wear performance. It is assumed the nanoparticles will undergo the rolling–deformation–destroy–decomposition four stages after they enter the friction contact area to play a role in reducing friction and anti-wear.

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纳米颗粒等效直径对油膜厚度的摩擦学响应

制备了不同尺寸和形貌的氢氧化硅酸镁（水合硅酸镁，MSH）纳米颗粒。等效直径（d _ë）引入到形态学差异转变成大小差异。摩擦学试验表明，纳米颗粒的抗磨损性是高度相关的d _Ë和油膜厚度。当中心油膜厚度（ħ _Ç）超过d _ë加入所有的粉末，具有不同的粉末的磨损减少率d _ê都集中在55％-61％的范围内。然而，当h _c降低，不同粉末的抗磨性能差异很大，这是由于相对较大的D _e会影响纳米颗粒进入摩擦接触区域的作用，从而降低其抗磨性能。假设纳米颗粒进入摩擦接触区后会经历滚动-变形-破坏-分解四个阶段，从而起到降低摩擦和抗磨损的作用。