Formation and Evolution of Noncrystalline Phase in Reaction-sintering of ZrSiO4/α-Al2O3 Mixed Powder

Abstract

Abstract: A noncrystalline phase can be formed in the reaction sintering of ZrSiO₄/α-Al₂O₃ mixtures by solid reaction between ZrSiO₄ and α-Al₂O₃. The formation
and evolution of the noncrystalline phase was investigated by using XRD and TEM techniques. It is shown that the noncrystalline phase formed at 1400℃,
where mullite initially formed, is rich in Al₂O₃ in comparison with stoichiometric mullite, and, with the temperature increasing, it evolves to be
rich in SiO₂ due to the enhanced dissociation of ZrSiO₄ and also the formation of Al₂O₃-rich mullite. The formation and evolution of the noncrystalline
phase is closely related to the growth mechanisms of mullite.

Key words: reaction-sintering, noncrystalline phase, zirconia, mullite

CLC Number:

TQ174

ZHAO Shi-Ke,HUANG Yong,WANG Chang-An,HUANG Xiao-Xian,GUO Jing-Kun. Formation and Evolution of Noncrystalline Phase in Reaction-sintering of ZrSiO₄/α-Al₂O₃ Mixed Powder[J]. Journal of Inorganic Materials.

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Formation and Evolution of Noncrystalline Phase in Reaction-sintering of ZrSiO₄/α-Al₂O₃ Mixed Powder

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