论文部分内容阅读
以Al2O3陶瓷成型体为基体,通过化学气相反应在陶瓷体内原位生长碳纳米管(CNTs),制备出CNTs/Al2O3陶瓷复合材料。结果表明,Al2O3陶瓷体中均匀分布有可观量的多壁CNTs,碳管根部嵌于Al2O3晶粒间并从晶粒表面生长出。在Al2O3陶瓷成型体中原位生长CNTs需严格控制生长条件,尤其是生长温度(850℃),温度过高和过低都难以长出CNTs,此外造孔剂、碳源和催化剂也影响CNTs的原位生长。对原位生长的CNTs/Al2O3复合体进一步高温烧结获得致密化的复合材料,其导电率达3.7 S/m,较纯Al2O3提高13个数量级。在陶瓷成型体中原位生长CNTs是一步法制备CNTs/陶瓷复合材料的新方法,可用于发展高性能的结构陶瓷和具有导电导热等多功能特性的新型陶瓷复合材料。
The CNTs / Al2O3 ceramic composites were prepared by in-situ growth of carbon nanotubes (CNTs) by chemical vapor phase reaction in the matrix of Al2O3 ceramics. The results show that there is a considerable amount of multi-walled CNTs distributed uniformly in the Al2O3 ceramic body. The carbon nanotube root is embedded in the Al2O3 grains and grows from the grain surface. In situ growth of CNTs in Al2O3 ceramic moldings requires strict control of growth conditions, especially growth temperature (850 ° C). It is difficult to grow CNTs when the temperature is too high or too low. In addition, the pore-forming agent, carbon source and catalyst also affect the original Growth. The CNTs / Al2O3 composites grown in situ were further sintered at high temperature to obtain a densified composite with a conductivity of 3.7 S / m, which was 13 orders of magnitude higher than pure Al2O3. The in-situ growth of CNTs in ceramic shaped bodies is a new method for one-step preparation of CNTs / ceramic composites. It can be used to develop high-performance structural ceramics and new ceramic composites with multi-functional properties such as conductivity and heat conductivity.