Abstract
In order to improve the thermal shock resistance of solar thermal heat transfer tube material, the mullite-cordierite composite ceramic as solar thermal heat transfer tube material were fabricated by pressureless sintering using α-Al2O3, Suzhou kaolin, talc, and feldspar as starting materials. The important parameter for solar thermal transfer tube such as water absorption (W a), bulk density (D b), and the mechanical properties were investigated. The phase composition and microstructure of the composite ceramics were analyzed by XRD and SEM. The experimental results show that the B3 sintered at 1 300 °C and holding for 3 h has an optimum thermal shock resistance. The bending strength loss rate of B3 is only 2% at 1 100°C by air quenching-strength test and the sample can endure 30 times thermal shock cycling, and the water absorption the bulk density and bending strength are 0.32%, 2.58 g·cm−3, and 125.59 MPa respectively. The XRD analysis indicated that the phase compositions of the sample were mullite, cordierite, corundum, and spinel. The SEM images illustrate that the cordierite is prismatic grain and the mullite is nano rod, showing a good thermal shock resistance for composite ceramics as potential solar thermal power material.
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Funded by the Major State Basic Research Development Program of China (973 Program) (No.2010CB227105)
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Xu, X., Ma, X., Wu, J. et al. In-Situ Preparation and thermal shock resistance of mullite-cordierite heat tube material for solar thermal power. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 28, 407–412 (2013). https://doi.org/10.1007/s11595-013-0704-7
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DOI: https://doi.org/10.1007/s11595-013-0704-7