ISSN   1004-0595

CN  62-1224/O4

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不同润湿性锡青铜表面摩擦特性实验研究

Tribological Properties of Bronze with Different Surface Wettability

  • 摘要: 运用微细掩膜脉冲电解加工在锡青铜表面制备了不同直径和面积率的微结构,并辅以低表面能处理得到了不同润湿性表面;采用接触角测量仪表征了润滑油的润湿性能;使用球-盘式摩擦磨损试验机研究了油润滑时不同润湿性锡青铜表面的摩擦学特性,并采用扫描电镜观察表面磨损形貌.研究结果表明:低表面能处理后的结构化试样具备疏油性,且其疏油性随着微结构密度增加而增加;与未经润湿性处理表面相比,低润湿性光滑表面和结构化表面摩擦系数最大降幅分别为21.2%、33.6%,磨损率降幅分别为17.3%、4.9%;在3 N载荷、球-面接触副条件下,所制备的4种不同直径微结构中,微结构直径小于30 μm时,面积率为4.9%或当直径大于等于30 μm时,面积率为8.7%的低润湿性表面减摩效果最好.

     

    Abstract: Micro-dimple arrays with various diameter and area coverage on bronze substrate were fabricated by through-mask Electrochemical Machining using ultrashort pulses and the textured surface was treated with fluorinated chlorosilanes. The surface wettability of lubricating oil was characterized by a contact angle meter. Friction tests were performed using a ball-on-disk apparatus and worn surface morphologies were observed through scanning electron microscopy. The investigation showed that the oleophobicity of F1060-treated textured bronze surfaces increased with the increasing micro-texturing density. Compared with the oleophilic smooth and textured surface,oleophobic smooth and textured surfaces exhibited lower friction coefficient with a reduction of 21.2%,33.6%,respectively and lower wear rate with a decline of 17.3%,4.9%,respectively. Under the condition of ball-on-disk experiment with 3 N load using the surface textured samples with 4 kinds of different diameter of micro-dimples,oleophobic surface with area ratio of 4.9% and 8.7% had an optimal friction reduction effect when a diameter was smaller or larger than 30 μm respectively.

     

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