Liquid Phase Sintering and Microstructure of Y-TZP/Al2O3 Composite

Abstract

Abstract: The influence of additive on the sintering and microstructure of Y-TZP/Al₂O₃ composite was studied through adding some additives
in Y-TZP/Al₂O₃. The composite with 99% theorecital density can be obtained at 1350℃. The liquid phase formed at sintering
process existed around the ZrO₂ and Al₂O₃ crystal grains. The small ZrO₂ and large Al₂O₃ crystal grains can be found in the
microstructure of the composite. This was related to the solubility of ZrO₂ and Al₂O₃ in silicate liquid phase. The ZrO₂ had a low
solubility in silicate liquid phase and the growth of ZrO₂ crystal grain was limited by liquid phase around it. Al₂O₃ had a high
solubility in the liquid phase, it formed a large and whisker-like crystal grain by solution-precipitation mechanism. The composite
also showed high mechanical properties. The flexure strength and fracture toughness were 640MPa and 7.2MPa·m^1/2 respectively.

Key words: composite, Y-TZP, Al₂O₃, sintering at low temperature

CLC Number:

TB323

ZHANG Yu-Feng,GUO Jing-Kun,HUANG Xiao-Xian,LI Bac-Shun. Liquid Phase Sintering and Microstructure of Y-TZP/Al₂O₃Composite[J]. Journal of Inorganic Materials.

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Liquid Phase Sintering and Microstructure of Y-TZP/Al₂O₃Composite

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