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目前,在柴油机上已普遍地采用了20高锡—铝合金轴瓦,对于铝硅合金轴瓦也正在进行试制。这些材料的轴瓦虽然具有较高的承载能力和疲劳强度,但由于硬度较高,切削性能较差,难以获得▽8以上的表面光洁度。因此,在瞬时润滑不良的情况下,容易发生曲轴的拉毛和烧瓦现象。为了改善这种情况,对于20高锡—铝合金轴瓦,必要时在工作表面上须镀一层厚为0.015～0.020毫米的铅一锡合金;对于铝硅合金轴瓦,则必须有合金镀层。该镀层,除能作为磨合缓冲层外,还可以改善轴瓦的顺应性能和抗脏污微粒嵌入的性能,从而减少曲轴
Currently, diesel engines have been widely adopted 20 high tin - aluminum alloy bearings, aluminum alloy bearing pads are also being trial. Although the bearings of these materials have higher carrying capacity and fatigue strength, they are difficult to obtain the surface finish of ▽ 8 or more because of their high hardness and poor cutting performance. Therefore, in the case of poor lubrication at an instant, cranking and burn-in of the crankshaft tend to occur. In order to improve this situation, a lead-tin alloy with a thickness of 0.015 to 0.020 mm shall be plated on the working surface for 20 high tin-aluminum alloy bushings, if necessary, and an alloy coating for aluminum-silicon alloy bushings. In addition to acting as a break-in cushion, the coating can also improve the compliance of the bush and the resistance to embedment of dirt particles, thereby reducing the number of crankshafts