摘要
以自制高成炭率氨酚醛树脂为基体炭源,采用溶剂分散铁、硼和铬催化剂、多次液相浸渍–炭化增密和石墨化处理的方法制备出密度为1.20～1.61g/cm3的碳/碳(C/C)复合材料。采用X射线衍射仪、扫描电子显微镜、四探针测试仪和弯曲强度测试等手段研究了催化剂种类对酚醛树脂基C/C复合材料结构和性能的影响。结果表明:硼、铁和铬等催化剂的引入可显著提高C/C复合材料的整体石墨化程度,降低其电阻率,催化石墨化效果按Fe,B,Cr的顺序依次降低;密度对电阻率及其分布有重要影响,体积密度较高的C/C复合材料的电阻率分布较均匀。催化剂的引入使得C/C复合材料的弯曲强度有所下降,但表现出明显的韧性断裂特征。
The carbon/carbon（C/C）composites with a desity of 1.20 to 1.61 g/cm^3 were prepared by liquid impregnation-carbonization and graphitization processes with phenolic resin as a carbon resource and Fe,B or Cr as catalysts dispersed in solvent.The effects of the catalysts on the structures and properties of the C/C composites were investigated by using X-ray diffractometer,scanning electron microscopy,testing of the resistivities and bending strength.The results show that boron,chromium and iron can improve the degree of graphitization of the C/C composites and give the low resistivities.Iron has a more superior catalytic effect,compared to boron and chromium.The effect of the density on the resistivity and the distribution is dominant.Composites with higher density has bet-ter-proportioned distribution of resistivities.The bending strength of the samples decreases in a certain degree with the introduction of catalysts.However,the samples become tougher.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2010年第9期1797-1802,共6页
Journal of The Chinese Ceramic Society
基金
国家"973"计划(2006CB600903)资助项目
关键词
碳/碳复合材料
酚醛树脂
催化石墨化
石墨化度
电阻率
弯曲强度
carbon/carbon composites
phenolic resin
catalytic graphitization
degree of graphitization
resistivity
bending strength
