Journal
JOURNAL OF POROUS MATERIALS
Volume 22, Issue 5, Pages 1235-1243Publisher
SPRINGER
DOI: 10.1007/s10934-015-0001-2
Keywords
C/Al2O3 aerogel; Compressive Young's modulus; Thermal conductivity; Heat treatment temperature; Phase transition
Funding
- Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD)
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1146]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1402016A]
- State key Laboratory of Materials-Oriented Chemical Engineering [KL11-09]
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Carbon/alumina (C/Al2O3) composite aerogel with high compressive strength and low thermal conductivity has been successfully synthesized by sol-gel method, followed by CO2 supercritical drying and carbonization. SEM images and compressive Young's modulus measurements show that the C/Al2O3 aerogel with a molar ratio of Resorcinol/Alumina (R/Al) of 1.0 presents homogeneous pore structures and obtains excellent compressive Young's modulus up to 90 MPa. Three weight losses regions are observed during heat treatment process, confirmed by TG/DSC measurements. XRD patterns and TEM images indicate that alpha-Al2O3 phase transition occurs only when heat treatment temperature reaches up to 1500 A degrees C with the adding of carbon source, 200 A degrees C higher than pure Al2O3 aerogel. The as-dried RF/Al2O3 aerogel possesses thermal conductivity as low as 0.025 W m(-1) K-1. The thermal conductivities of C/Al2O3 aerogels increase gradually with the increase of heat treatment temperatures, caused by increasing solid thermal conductivity. The thermal conductivities range from 0.033 to 0.049 W m(-1) K-1, suitable for efficient thermal insulations uses.
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