| 摘要 |
A bearing lining comprises a bearing backing layer 1 coated with first 4 and second 5 overlay layers, the first overlay layer being provided between the backing layer and the second overlay layer, the overlay layers each comprising a matrix material and a soft-phase material that is substantially insoluble in the matrix and dispersed as soft-phase particles, and the first overlay layer comprising a higher proportion by weight of a grain size reduction additive than the second overlay layer. The grain size reduction additive may be one or more elements selected from Co, Cr, Fe, Mg, Mn, Ni, Si, V and Zn. The matrix material preferably comprises Al, Ag, Cu, or an alloy of these metals, and the soft-phase material preferably comprises one or more elements selected from Bi, Cd, In, Pb, Sb or Sn. The overlay layers may comprise regions of a composite overlay layer in which the proportion of grain size reduction additive decreases with increasing separation from the bearing backing layer. Also disclosed are a process of manufacturing a bearing lining, a vehicle engine comprising the bearing lining of the invention, and the use of a grain size reduction additive to reduce the grain size of a soft-phase of a bearing coating comprising a soft-phase dispersed in a matrix. |
