水热共沉积C/C复合材料的Ni催化石墨化及性能研究  

Study on Ni catalytic graphitization and properties of C/C composites prepared by hydrothermal co-deposition

作　　者：潘利敏 欧阳海波 刘雪[2] 刘一军 黄剑锋 黄玲艳 PAN Li-min;OUYANG Hai-bo;LIU Xue;LIU Yi-jun;HUANG Jian-feng;HUANG Ling-yan(Monalisa Group Co.,Ltd.,Foshan 528211,China;School of Materials Science and Engineering,Shaanxi University of Science ＆ Technology,Xi＇an 710021,China)

机构地区：[1]蒙娜丽莎集团股份有限公司,广东佛山528211 [2]陕西科技大学材料科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报》2018年第5期123-128,共6页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(51402177)

摘　　要：采用水热共沉积结合热处理技术制备出了含Ni颗粒的碳/碳(C/C)复合材料,并研究了热处理温度对C/C复合材料微观结构、力学性能及电学性能的影响规律.结果表明,随着热处理温度的升高,复合材料的基体碳由无定型的颗粒状向层状石墨转变,其石墨化度提高,复合材料中Ni的引入对基体具有催化石墨化作用.1 400℃热处理较800℃热处理C/C复合材料的强度降低了27%,模量提升了15%,其断裂行为由假塑性断裂向脆性断裂转变.1 400℃热处理较800℃热处理C/C复合材料的电阻率降低了67.9%.石墨化度的提高增大了石墨微晶尺寸,降低了石墨层间距,减小了晶界的散射作用,从而提升了载流子浓度,有利于降低C/C复合材料的电阻率.Carbon/carbon （C/C） composites were prepared by hydrothermal co deposition combined with heat treatment. The effect of heat treatment temperature on microstructure, mechanical and electrical properties of the C/C composites was studied. The matrix carbon of the C/C composites changed from amorphous to lamellar graphite structure with the increase of heat treatment temperature. The graphitization degree of C/C composites increased with increasing of heat treatment temperature,indicating that Ni particles in the matrix exhibited catalytic graphitization behavior. The bending strength of the C/C composites reduced by 27% and the modulus increased by 15% ,while the resistivity of the C/C composites reduced by 67.9% with the increase heat treatment temperature from 800 ℃ to 1 400 ℃.The frac ture behavior changed from the pseudo plastic fracture to brittle fracture. It was attributed to the increase of graphite crystallite size and the decrease of the layer spacing resulting from the improvement of graphitization degree of the C/C composites. This microstructure was help to reduce the grain boundary scattering effect and then promote the carrier concentration,which was beneficial to decrease the resistivity of C/C composites.

关 键 词：碳/碳复合材料 催化石墨化 力学性能 电阻率 

分 类 号：TB332[一般工业技术—材料科学与工程]