Abstract
SiBCN ceramics were prepared and modified with copper (10, 20 and 30 wt%) by polymer-derived ceramics route. The polymer-to-ceramic transformation of the precursor was investigated and the tribological behavior of the SiBCN and Cu-SiBCN ceramics at 800 degrees C was studied in terms of composition, microstructure, high -temperature friction properties and wear mechanism. It turned out that copper incorporation enhanced the tribological performances of the ceramics both at ambient and elevated temperatures. The average friction co-efficient of SiBCN was 0.23 at 800 degrees C, while it decreased to 0.18 with the wear rate reduced by one magnitude order after introducing 30 wt% Cu. The generated lubricious CuO-SiO2 tribo-film originating from the tribo-chemical reaction was the major high-temperature lubrication mechanism for the Cu-SiBCN composites.

Keywords Plus：LUBRICATING MATERIALSSELF-LUBRICITYMICROSTRUCTURECOMPOSITESPOLYBOROSILAZANECONVERSION

Published in TRIBOLOGY INTERNATIONAL，Volume185；10.1016/j.triboint.2023.108540，JUL 2023