Preparation and characterization of stoichiometric zirconium carbide foams by direct foaming of zirconia sols

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• 作者：Fei Li ; Mengshi Liang ; Xi-Fei Ma ; Xiao Huang ; Guo-Jun Zhang
• 关键词：Ultra high temperature ceramic foams ; Zirconium carbide ; Direct foaming ; Carbothermal reduction
• 刊名：Journal of Porous Materials
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：22
• 期：2
• 页码：493-500
• 全文大小：1,344 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Characterization and Evaluation Materials
  Physical Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1573-4854

文摘

The studies on ultra high temperature ceramic foams are very limited due to the harsh synthesis conditions and the lack of appropriate preceramic precursors. In this work, highly porous stoichiometric zirconium carbide foams are prepared by direct foaming of zirconia sols followed by carbothermal reduction at 1500?°C under argon. The microstructure of the obtained ZrC foams can be tailored by controlling the viscosities of the sols, the concentrations of the blowing and curing agents. The ZrC foams can be prepared with open- or closed-cell structure in a controllable manner. The densities of ZrC foams vary from 0.12 to 0.53?g/cm3, while the porosities vary from 93.0 to 67.6?% correspondingly.