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In Situ Toughened α-Sialon Ceramics Doped with Lutecia and Ytterbia

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Abstract:

Ytterbia and Lutecia were adopted to stabilize α-sialon ceramics during a two-step hot press sintering, respectively. Although Yb3+ and Lu3+ possess the similar small ion size (0.86 Å and 0.85 Å) as two adjacent rare-earth elements, Yb- and Lu-α-sialon ceramics present very different microstructure and properties. Yb-α-sialon ceramic is fully composed of α-sialon phase without any secondary phase. The ceramic incorporated with Lu2O3 also consists of α-sialon phase, but a trace amount of intergranular phase J′ (Lu4Si2-xAlxO7+xN2-x) still remains at the boundary. Microstructure observation indicates the fully equiaxial grain morphology of Yb-α-sialon ceramic. However, elongated grains appear in the Lu-α-sialon ceramic, coexisting with small equiaxed grains. Owing to the almost full α-sialon phase assemblage, both ceramics present high hardness with the value of over 21 GPa. Lu-α-sialon ceramic possesses good toughness, which is attributed to the elongated grains assisting the facilitation of toughening mechanism. The equiaxied grain morphology results in a comparatively lower toughness for Yb-α-sialon ceramic.

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Periodical:

Key Engineering Materials (Volumes 353-358)

Pages:

1525-1528

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.353-358.1525

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Online since:

September 2007

Authors:

Chun Feng Liu, Feng Ye, Yu Zhou

Keywords:

Lutecia, Microstructure, Property Analysis, Ytterbium, α-Sialon

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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