Preparation and Performance of β-Sialon/Si₃N₄ Composite Ceramics for Solar Heat Absorber

Abstract:

β-Sialon/Si₃N₄ composite ceramic were prepared from starting materials of α-Si₃N₄, AlN and Al₂O₃ by pressureless sintering. The physical properties, phase composition and microstructure were tested by modern testing technology. The effect of different additives such as Y₂O₃, La₂O₃ and borax on the sintering temperature and physical properties was studied. The results show that D3 is the best formula, firing shrinkage rate of the sample is 14.14%, water absorption 3.16%, porosity 9.02%, bulk density 2.85g·cm^-3 and bending strength 193.87MPa after firing at 1580°C. XRD analysis indicates that the main phases of D3 are β-Sialon, β-Si₃N₄ and corundum. SEM analysis shows that the microstructure of D3 sample is quite dense and the pores distribution is uniform, the diameter of the pore is about 1~5μm. β-Sialon/Si₃N₄ composite ceramic has high bulk density, bending strength and fine microstructure, which is a new choice of the heat absorb material for solar thermal power generation system.

• Periodical: Applied Mechanics and Materials (Volume 692)
• Pages: 234-239
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.692.234
• Online since: November 2014
• Authors: Jian Feng Wu, Ya Xiang Zhang*, Xiao Hong Xu, De Zhi He, Yang Zhou, Yi Liu
• Keywords: Heat Absorber Material, Microstructure, Properties, Solar Thermal Power Generation, β-Sialon/Si₃N₄ Composite Ceramics

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