Influence of Alumina Source on Phase Composition and Microstructure of CA6 Porous Materials

Abstract

Abstract: CA₆ materials have been synthesized by high temperature solid state reaction using CaCO₃ as calcium source combined with Al(OH)₃, uf-Al₂O₃ and industrial Al₂O₃ as alumina sources. Effects of alumina sources on phase composition, microstructure and properties of CA₆ materials were studied. The results show that CA₆ forms at 1 300 ℃ using Al(OH)₃ and uf-Al₂O₃ as alumina sources. Solid state reaction temperature of samples finishes at 1 500 ℃. Further increasing of firing temperature has no effect on the phase composition. The microstructure of CA₆ produced by the reaction is changed with different alumina sources. When Al(OH)₃ is used as the alumia source, the microstructure of CA₆ is mostly platy. However, as used industrial Al₂O₃ as the alumia source, the microstructure of CA₆ is mostly plate-like and granular, but the microstructure of CA₆ is mostly equiaxed grains by using uf-Al₂O₃ as precursor. When used uf-Al₂O₃ as the source, the compressive strength and bulk density of the materials are the highest, and the porosity is the lowest. As used Al(OH)₃ as alumina source, the compressive strength and bulk density of the materials are the lowest, and the porosity is the highest.

Key words: calcium hexaaluminate, porous material, alumina source, phase composition, solid state reaction

CLC Number:

TQ175

KANG Guowei, LIU Xin, WU Ran, WANG Di, LI Ying, LIU Xinhong, JIA Quanli. Influence of Alumina Source on Phase Composition and Microstructure of CA₆ Porous Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 1038-1045.

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Influence of Alumina Source on Phase Composition and Microstructure of CA₆ Porous Materials

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