Microstructure and Dry Sliding Wear Behavior of Copper-Graphite Composites by Spark Plasma Sintering of Mechanically Alloyed Powders

摘要

Copper-graphite composites were prepared using ball milling and subsequent spark plasma sinteringrn( SPS). A Cu - based supersaturated solid solution was obtained after milling, together with nanoscale layered crystallites ofrngraphite and amorphous-like carbon. SPS allowed densification of the Cu - C composites while preserving theirrnnanostructure from mechanical alloying. C - existing low coefficient of friction and low wear rates were observed atrnintermediate load levels for the consolidated copper-graphite composites. This behavior is explained as due to the formationrnof a lubricious tribolayer covering the worn surface, in contrast to the adhesive wear at low loads and delamination wear atrnhigh loads.