摘要
通过在浓硫酸或浓硝酸中浸泡柔性石墨纸（板），然后在200℃～750℃膨化制备了低密度膨胀石墨块。研究了插层剂、插层时间和膨化温度对膨胀石墨块体积密度和外形完整程度的影响。结果表明：膨化温度越高，制得的膨胀石墨块密度越低，越难获得完整的外形。以浓硫酸或浓硝酸插层时，适宜的膨化温度分别约为550℃和650℃，插层时间应为3h以上。发现膨胀石墨块主要存在两种外观，一种为均匀膨胀，另一种为非均匀膨胀。
Low density monolithic expanded graphites were prepared from flexible graphite sheet or plate by soaking the sheet or plate in concentrated sulfuric acid or nitric acid for intercalation and then expanding them at temperatures from 200℃ to 750℃. The effects of the type of intercalating agent, intercalating time and temperature for expansion on bulk density and integrity of the monoliths were investigated. Results show that the higher the expansion temperature, the lower the bulk density, and the more difficult to obtain a monolithic expanded graphite with structural integrity. Monolithic expanded graphites with structural integrity can be obtained using concentrated sulfuric acid or nitric acid as intercalating agent for over 3 h at an expansion temperatures of less than 550 ℃ for the former or less than 650℃ for the latter. Both uniform and non-uniform expansions were found in the monolithic products.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2006年第3期253-258,共6页
New Carbon Materials
基金
湖北省教育厅优秀中青年人才项目(2004Q001)~~
关键词
膨胀石墨块
制备
柔性石墨
Expanded graphite block
Preparation
Flexible graphite sheet
