Anovel ceramic composite inward gradient distribution layer has been developed.Thelayer is a lubricating layer inwhich soft-metal\nlubricants are compounded into the ceramic matrix by high frequency induction infiltrating method. The design of the layer and its\nlubricating mechanism are investigated in the paper. The results show that the property of the layer greatly depends on the wetting\nangle of the soft-metal lubricants on the matrix and the proportion of Ag, Cu, Sn, and Pb as well as the infiltrating parameters.\nBased on a lot of experiments, a novel inward gradient layer with Pb28Sn19Ag6Cu has been developed. The layer has an excellent\nlubricating property (friction coefficient about 0.2âË?¼0.3 at 600âË?Ë?C). The research reveals the lubricating mechanism, observing the\nphenomenon that the soft-metal in the matrix diffuses out of the frictional surface, and measures the lubricating film thickness as\nabout 20
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