新型炭材料2011，Vol.26Issue(2)：145-150,6.
多孔C/SiC复合材料的制备及其性能
Fabrication and properties of porous C/SiC composites
摘要
Abstract
Preforms made of carbon fibers and sacrificial tungsten fibers as a pore forming agent were repeatedly infiltrated with polycarbosilane and pyrolysed for 14 cycles, followed by aqua regia leaching to remove the tungsten fibers to form porous C/SiC composites. The pore structure, mechanical properties and permeability of the porous C/SiC composites to water and kerosene were respectively studied by a scanning electron microscope,a universal materials testing machine and home-made permeation equipment based on a fluid flow model in capillaries. Results showed that the pores of the porous C/SiC composites were mostly straight and that the open porosity can be controlled by the volume fraction of tungsten fibers used. The bend strength , Young's modulus and fracture toughness were 358 MPa, 124 GPa and 16. 7 MPa·m1/2 respectively when the open porosity of the composite was 23. 5％ . The fluids permeated through the porous C/SiC composites by linear laminar flow( the osmosis rate value is 1. 02×10-3 mm2 ) . The composites exhibited tough fracture behavior and the presence of pores didn't lead to a significant deterioration of their mechanical properties.关键词
多孔C/SiC复合材料/孔隙预置技术/开孔率/渗透率Key words
Porous C/SiC composites/ Prefabricating pore media technology/ Open porosity/ Osmosis rate分类
通用工业技术引用本文复制引用
吉洪亮,张长瑞,周新贵,曹英斌..多孔C/SiC复合材料的制备及其性能[J].新型炭材料,2011,26(2):145-150,6.基金项目
国家863计划(2002AA724064). （2002AA724064）
