摘要
以中间相沥青为原料,通过带形截面喷丝板进行熔融纺丝,对所获中间相沥青纤维进行适度氧化处理,而后通过热压工艺将氧化中间相沥青纤维进行无黏结自烧结成型,并借助红外分析和扫描电镜等手段研究了不同最终氧化温度对带状沥青纤维的官能团变化与由其自烧结制备高导热炭材料的成型性及性能影响。结果表明:经260℃不熔化处理的中间相沥青纤维热压成型,能获得具有高密度、高抗弯强度和高传导性的新型炭材料,所制备材料的密度高达2.16 g/cm3,抗弯强度达到125.9MPa,电阻率和热导率分别达到0.56μΩm和830W/(m.K)。
Mesophase pitch was melt-spun with a spinneret of ribbon-shaped section followed by oxidative stabilization; then the mesophase ribbon-shaped oxidized fibers were self-sintered by hot-pressing without using a binder. The effect of ultimate oxidation temperature for mesophase-based ribbon-shaped fibers under the same heating rate and oxidation time on the functional groups of the fibers, and the formability and properties of the resulting carbon materials were investigated by infrared spectroscopy （IR） and scanning electron microscopy. Results showed that the ribbon-shaped mesophase fibers oxidized at a moderate range of ultimate temperature can be self-sintered into carbon materials with high conductivity, density and bend strength. As an example, the electrical resistivity, thermal conductivity, bend strength and density of carbon materials formed by self-sintering of ribbon-shaped fibers oxidized at an ultimate temperature of 260 ℃ are 0.56 μΩm, 830 W/（ m · K）, 125.9 MPa and 2.16 g/cm^3, respectively.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2005年第3期223-228,共6页
New Carbon Materials
基金
国家自然科学重点基金(197899037)~~
关键词
中间相沥青纤维
不熔化
自黏结成型
传导性
Mesophase pitch-based fibers
Oxidization
Self-adhesive forming
Conductivity
