科研之友
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摘要
Biomorphic TiC ceramics were covered with highly porous carbon, so-called carbide-derived carbon (CDC), by selective etching of Ti with chlorine in a temperature range between 400 degrees C and 1,200 degrees C. Microporous carbon with narrow pore size distribution was obtained at temperature ranging from 400 degrees C to 800 degrees C. Chlorination at higher temperatures leads to formation of mesopores because of increased degree of order of the obtained CDC. A higher etching rate as well as higher degree of order at lower reaction temperature was observed if a catalytically active metal like Fe or Ru was presented during the chlorination process. This is associated with an increased amount of mesopores and with a decrease in specific surface area. Therefore, the CDC processing in the presence of a catalyst offers another way to produce ordered carbon structures at lower temperatures.
- 出版日期2010-6
