Ni/SiO_2催化制备炭/炭复合材料研究  

STUDY OF CATALYTIC FABRACATION OF C/C COMPOSITES WITH Ni/SiO_2 AS CATALYST

作　　者：周振中[1] 李铁虎[1] 艾艳玲[1] 宋发举[1] 

机构地区：[1]西北工业大学材料科学与工程学院,陕西西安710072

出　　处：《炭素技术》2005年第5期1-5,共5页Carbon Techniques

基　　金：航空科技预研项目(41801060501)

摘　　要：利用常规化学气相渗透工艺,在针刺炭布预制体中添加3.5%～4.0%Ni/SiO2负载型金属催化剂,以丙烯作碳源气体,在750～900℃下,经过100h的沉积,炭/炭(C/C)复合材料的密度达到1.65g/cm3,其催化沉积炭的速率比不含催化剂时提高了3倍以上。该材料经高温处理后,氧化失重率低,氧化起始温度高。应用扫描电镜(SEM),X射线衍射分析(XRD)和光学显微镜观察了基体炭的形貌,分析了催化沉积炭和抗氧化机理。实验结果证明,用该催化化学气相渗透法制备C/C复合材料,周期短,成本低,抗氧化性能好。By making use of a conventional isothermal chemical vapor infiltration （ICVI） process, silica -supported Ni catalysts with different loading content were loaded onto the c - fiber cloth substrates that were further treated at 750 - 900℃ to make high density C/C composites with propylene as carbon source gas. It has been found that the density of the as - prepared C/C composite could reach 1.65 g/cm^3 in 100 h, and the corresponding catalytic depositing rate was three times quicker compared with the non- catalytic process. After further high- temperature treatment, the C/C composites show smaller weight loss and higher initial oxidation temperature. The surface morphology of the substrate carbon was examined by SEM, XRD and optical microscopy. The mechanisms involved in the catalytic deposition process and in the oxidation resistance were studied. The experimental results have proved that the C/C composites made by the catalytic CVI （CCVI） process has a number of advantages such as short preparation time, low cost and high oxi- dation - resistant.

关 键 词：炭/炭复合材料 催化化学气相渗透 Ni/SiO2 催化沉积 

分 类 号：TB332[一般工业技术—材料科学与工程]