摘要
结合Al2O3溶胶—凝胶技术和聚硅氧烷浸渍裂解技术制备出三维编织碳纤维增强莫来石复合材料(3D BCf/mullite)。研究表明,以AlCl3·6H2O和(CH2)6N4为原料的溶胶—凝胶工艺能制备出纳米γ Al2O3粉,它与聚硅氧烷在1400℃N2中共裂解可反应生成莫来石。所得3D BCf/mullite的密度为1.784g/cm3,弯曲强度和断裂韧性分别为282.5MPa和17.7MPa·m1/2。材料中较多的孔隙是材料密度和弯曲强度不高的原因所在。
Three-dimensional carbon fiber reinforced mullite composites (3D-B Cf/mullite) are fabricated via Al2O3 Sol-gel and polysiloxane infiltration-pyrolysis technology. The results show that nanometer γ-Al2O3 powders can be prepared through sol-gel using AlCl3·6H2O and (CH2)6N4 as starting materials. Mullite can be synthesized by co-pyrolysis reaction between polysiloxane and sol-gel derived γ-Al2O3 at 1400℃ under N2. The density, flexural strength, and fracture toughness of 3D-B Cf/mullite composites are 1.784g/cm^3, 282.5MPa and 17.7MPa·m^(1/2), respectively. It is the large quantities of pores in composites that result in low density and flexural strength of 3D-B Cf/mullite composites.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2003年第6期26-29,共4页
Journal of National University of Defense Technology
基金
国家部委预研项目
关键词
莫来石复合材料
连续纤维增强
先驱体浸渍裂解
溶胶-凝胶
mullite matrix composites
continuous fibre reinforcement
precursor infiltration and pyrolysis
Sol-gel
