硅酸盐学报2012，Vol.40Issue(3)：340-344,5.
纳米SiO_2对先驱体浸渍裂解法制备SiC_f/SiC复合材料力学性能的影响
Effect of Nano-SiO_2 on Mechanical Properties of SiC_f/SiC Composites Fabricated via Precursor Infiltration Pyrolysis Process
摘要
Abstract
The 2.5-dimensional silicon carbide fiber reinforced silicon carbide（2.5D-SiCf/SiC） composites were fabricated via a pre-cursor infiltration pyrolysis（PIP） process with a nano-sized silica powder as a filler.The influence of nano-SiO2 content in the pre-cursor solution on the mechanical properties of the as-received SiCf/SiC composites was investigated.The results show that the intro-duction of nano-SiO2 can restrain the shrinkage upon the pyrolysis and densify the composites efficiently.However,the excessive amount of SiO2 could cause a high viscosity of impregnation solution,resulting in the lower infiltration efficiency.The content of nano-sized SiO2 had an influence on the mechanical properties of the composites.The flexural strength and fracture toughness of the composites with the nano-sized SiO2 filler both were better than those without the nano-sized SiO2 filler.The flexural strength of the composites firstly increased and then decreased with the increase of nano-sized SiO2 content.The superior mechanical properties could be obtained,i.e.,the flexural strength could reach 211.1 MPa,when the nano-sized SiO2 content was 6%.关键词
碳化硅纤维增强碳化硅/复合材料/纳米二氧化硅/先驱体浸渍裂解/力学性能Key words
silicon carbide fiber reinforced silicon carbide/composites/nano-silica/precursor infiltration pyrolysis/mechanical property分类
通用工业技术引用本文复制引用
周璇,朱冬梅,桂佳,罗发,周万城..纳米SiO_2对先驱体浸渍裂解法制备SiC_f/SiC复合材料力学性能的影响[J].硅酸盐学报,2012,40(3):340-344,5.基金项目
国家自然科学基金 （）
凝固技术国家重点实验室（西北工业大学）自主研究课题（KP200901）资助项目 （）
