The 3-D needled C/C preforms with different densities deposited by chemical vapor infiltration (CVI) method were used to fabricate C/C-SiC composites by gaseous silicon infiltration (GSI). The porosity and CVI C thickness of the preforms were studied. and the effects of preform density on the mechanical and thermal properties of C/C-SiC composites were analyzed. The results show that ... https://4thmoontoyers.shop/product-category/accessories/