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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 320Preparation and Performance of Andalusite Bonded...

Preparation and Performance of Andalusite Bonded SiC Solar Heat-Absorbing Ceramics

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Abstract:

Using andalusite, SiC, Su Zhou Kaolin and Guang Xi quartz as materials, andalusite bonded SiC heat absorbing ceramic was prepared by pressureless firing in the ceramic preparation process. The influence of gradient SiC on microstructure and properties of the samples were studied. Using the testing technology of XRD, SEM, and etc., physical and chemical properties, phase composition and microstructure were tested and analysised.The results indicate that andalusite bonded SiC heat absorbing ceramic, which prepared to have a low firing shrinkage rate, high refractoriness and a good microstructure. The best firing temperature of the best formula C4 is 1460°C, firing expansion rate is 0.98%, bending strength is 32.52MPa,porosity is 30.74%, bulk density is 2.05g·cm^-3, refractoriness is 1650°C,growth rate of oxidation weight is 2.769mg·cm^-2 and have no crack after 30 times thermal shock. The bending strength has increased 11.15% after thermal shock. XRD analysis indicated that the main phase compositions are α-SiC, mullite and cristobalite.SEM studies show that there are many connected pores in the samples, the diameters of the pores are 10~20μm. Andalusite bonded SiC heat absorbing ceramic have a low firing expansion rate, high bending strength and good microstructure, which is suit for tower type solar thermal power generation.

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Periodical:

Applied Mechanics and Materials (Volume 320)

Pages:

52-59

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.320.52

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Online since:

May 2013

Authors:

Jian Feng Wu, Meng Liu, Xiao Hong Xu, Ya Xiang Zhang, Kun Li, Guo Xia Yi

Keywords:

Andalusite Bonded Silicon Carbide, Heat Absorbing Ceramic Materials, Microstructure, Pressureless Firing, Property, Solar Thermal Power Generation

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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