摘要
以二茂铁为催化剂、有机小分子碳氢化合物为液态碳源,采用化学液相气化沉积工艺制备出密度为1.67 g/cm^3的大尺寸C/C复合材料。分析了不同催化剂含量对C/C复合材料基体织构的影响。加入催化剂后材料的组织结构趋向于生成光滑层和各向同性热解碳,并在碳基体中伴生有碳纳米线和多壁碳纳米管的生成。当催化剂含量(<1%)较低、沉积温度较高时有碳纳米线出现,且随着催化剂含量增加,碳纳米线直径由50～100 nm减小到20 nm,长度逐渐增加;当催化剂含量大于1%时,此时出现多壁碳纳米管,直径在30～100 nm之间,顶部并有碳包覆金属颗粒的生成。
The large-scale C/C composites with a density of 1.67g/cm^3 had been densificated by chemical liquid-vapor infiltration using mixing ferrocene as the source of catalyst in the liquid precursor. The influences of various catalyst contents on matrices of C/C composites were analyzed. The microstructures of C/C composites tend to form SL and ISO pyrocarbon, together with carbon nanowires and multi-walled nanotubes in the matrices. It is revealed that the carbon nanowires, with the diameter decreasing from 50-100 to 20 nm and the length increasing with the increase of catalyst contents, have been found under the condition of low contents （〈1%） and high temperature. However when catalyst contents are larger than 1%, the multi-walled carbon nanotubes with the diameter about 30-100 nm together at the top have been found with the presence of carbon encapsulated （Fe） nanoparticles.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A03期530-534,共5页
Rare Metal Materials and Engineering
基金
国家"973"(2006CB600908)
西北工业大学研究生创业种子基金(Z200613)项目资助
关键词
化学液相气化沉积
炭/炭复合材料
催化
碳纳米管
碳纳米线
chemical liquid-vapor infiltration
C/C composites
catalytic
carbon nanowires
carbon nanotubes
