Facile preparation of ZrCO composite aerogel with high specific surface area and low thermal conductivity |
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| Authors: | Sheng Cui Hao Suo Feng Jing Shuwen Yu Jun Xue Xiaodong Shen Benlan Lin Shengjun Jiang Yu Liu |
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| Institution: | 1.Department of Materials Science and Engineering,Nanjing Tech University,Nanjing,China;2.Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,Nanjing Tech University,Nanjing,China;3.Institute of Chemistry Materials,CAEP,Mianyang,China |
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| Abstract: | A novel ZrCO composite aerogel is synthesized using zirconium oxychloride and resorcinol–formaldehyde (RF) as precursors through the sol–gel route and carbothermal reduction process. The effects of different Zr/R molar ratios and calcination temperatures on the physical chemistry properties of ZrCO aerogels are investigated. The ZrCO composite aerogel consists of the C/ZrO2/ZrC ternary aerogel. The results show that with the increase of R/Zr molar ratios, the specific surface area and bulk density increase with calcination temperature up to 1300?°C, but decrease at even temperature (1500?°C). The specific surface area is as high as 637.4?m2/g for ZrCO composite aerogel (R:Zr?=?2:1), which was higher than ever reported. As the heat-treatment temperature increases to 1500?°C, the ZrC crystalline phase occurs and the t-ZrO2 phase still appears within the composite. The thermal conductivity of the carbon fiber mat-reinforced composite aerogel is as low as 0.057?W/m/K at room temperature (25?°C). | |
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