材料期刊网

Using carbon fiber needled fabrics with Cu-mesh and graphite powder as the preform,Cu mesh modified carbon/carbon(C/C-Cu) composites were prepared by chemical vapor deposition (CVD) with Call6 and impregnation-carbonization (I/C) with furan resin.C/C composites,as a comparison,were also prepared.Their microstructures and wear morphologies were observed by optical microscopy (OM) and scanning electron microscope (SEM),respectively.Wear behavior of C/C and C/C-Cu composites under different applied loads were investigated on a pin-on-disc wear tester.The results show that Cu meshes are well dispersed and pyrolytic carbon is in rough laminar structure.Both C/C and C/C-Cu composites had good wear properties.The currentcarrying capacity of C/C-Cu composites increases and the arc discharge is hindered as the applied load increases from 40 N to 80 N.Both C/C and C/C-Cu composites had good wear properties.The mass wear rate of C/C-Cu composites under 80 N was only 4.2％ of that under 60 N.In addition,C/C-Cu composites represent different wear behaviors because wear mechanisms of arc erosion,abrasive wear,adhesive wear,and oxidative wear are changing under different applied loads.