Abstract: Effect of needle-punching processing parameters on carbon-carbon (C-C) composites reinforced by carbon cloth and carbon fiber net was studied by a mechanical needling equipment in the thickness direction of perform. It is shown that high values of needle-punching density (ND) and punching depth (PD) lead to high values of perform density and fiber volume fraction, both ND and PD have larger effect on interlaminar shear strength (ILSS) than on compression strength and bending strength of C-C. The interlaminar shear strength, tensile strength, and bending strength of C-C all increase lineally with increasing punching density from 20 to 50punch/cm², also increase with increasing punching depth range from 12 to 16mm.The optimized ND parameters are 30punch/cm², which result in 15.5MPa of ILSS, 137.68MPa of bending strength and 224MPa of X-Y direction compression strength, respectively. The optimized PD parameters are 12mm, which result in 134MPa of bending strength and 213.2MPa of X-Y direction compression strength, respectively.

Key words: needle-punching processing parameter, carbon/carbon composites, preform structure, mechanical property