石墨化CVI泡沫炭的结构和性能  

Performance of Graphitized CVI Carbon Foams

作　　者：王永刚[1] 林雄超[1] 杨慧君[1] 张江松[1] 许德平[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《材料科学与工程学报》2008年第3期365-368,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(50274071)

摘　　要：本文采用化学气相渗透技术(CVI)对泡沫炭进行复合处理,利用SEM、XRD等分析手段对石墨化样品进行了分析。研究结果表明,CVI热解炭在泡沫基体的沉积方式是:小颗粒积聚生长成为大颗粒,大颗粒不断接合,经石墨化处理后形成更加规则的结构。石墨化CVI泡沫炭相比原生石墨泡沫炭的电学和力学性能有很大提高,在350℃、2MPa压力条件下制备的石墨化CVI泡沫炭的电导率可以提高近0.9倍;在350℃、1MPa压力条件下制备的石墨化CVI泡沫炭的压缩强度增大近3.5倍。因此,CVI处理可以有效改善石墨泡沫炭的基体结构,提高石墨泡沫炭性能。Carbon foams treated with CVI （Chemical vapor infiltration） were graphitized and the SEM （Scan electron microscope） and XRD （X-ray diffraction） were usecl to analyze the graphitized foam. The modes of granular pyrolytic carbon deposition were discussed. It indicates that： the mass original pyrolytic carbon grains depositing together grow to bigger and the bigger grains connect ceaselessly to form the anomalistic layer configuration. The results show that the conductance and mechanical performance of graphite foams treated with CVI were improved apparently. The conductance of CVI treated graphite foams （preparation condition 350℃, 2MPa） increase almost 0. 9 times. The compressive strength of CVI treated graphite foams （preparation condition 350℃ , 1MPa） increase 3. 5 times. It was found that the CVI pyrolytic carbon, with graphitization treatment, amended the skeleton structure effectively and that availably improved the graphitized foams performance.

关 键 词：化学气相渗透 压缩强度 电导率 热解炭 

分 类 号：TB332[一般工业技术—材料科学与工程]