Effect of Graphitization on the Microstructure and Properties of Mo sub(2)C-Modified C/C-Cu Composites

Carbon/carbon-copper(C/C-Cu) composites are fabricated by infiltration of Cu into Mo sub(2)C interlayer-modified carbon/carbon(C/C) preforms. Effect of graphitization on the microstructure and properties of the C/C-Cu composites is studied. The C/C-Cu composite with graphitization shows lower electrical resistivity, thermal expansion coefficient, friction coefficient, and an obvious higher thermal conductivity due to higher graphitization degree. However, it presents lower flexural strength, impact toughness, and higher wear rate. The composite with graphitization exhibits mainly abrasive wear while that without graphitization exhibits mainly adhesion wear, and both composites show oxidation wear. Both the C/C preforms with and without graphitization are penetrated by Cu after modifying with Mo sub(2)C interlayer. The C/C-Cu composite with graphitization shows better electrical and thermal conductivity, while lower strength and wear resistance. The composite with and without graphitization exhibits mainly abrasive wear and adhesion wear, respectively, and both composites show oxidation wear.