Anisotropic grain growth in boria-doped diphasic mullite gels

Seong Hyeon Hong; Gary L. Messing

doi:10.1016/s0955-2219(98)00211-8

Anisotropic grain growth in boria-doped diphasic mullite gels

Seong Hyeon Hong, Gary L. Messing

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

Densification and anisotropic grain growth were investigated in sol-gel derived, boria-doped diphasic mullite. Boria enhanced viscous flow densification by reducing the viscosity and also produced a fine grain microstructure. Whisker-like mullite grains evolved from the dense, equiaxed microstructure. The onset temperature was ~1500°C. Chemical leaching was employed to characterize the anisotropic grains. Growth kinetics showed that anisotropic grains followed the empirical equation Gⁿ-G_oⁿ=Kt with n=3 and n=4 for the length and thickness directions, respectively. The activation energies for grain growth were 660kJ mol^-1 for elongation and 800 kJ mol^-1 for thickening.

Original language	English (US)
Pages (from-to)	521-526
Number of pages	6
Journal	Journal of the European Ceramic Society
Volume	19
Issue number	4
DOIs	https://doi.org/10.1016/s0955-2219(98)00211-8
State	Published - Apr 1999

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Materials Chemistry

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10.1016/s0955-2219(98)00211-8

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title = "Anisotropic grain growth in boria-doped diphasic mullite gels",

abstract = "Densification and anisotropic grain growth were investigated in sol-gel derived, boria-doped diphasic mullite. Boria enhanced viscous flow densification by reducing the viscosity and also produced a fine grain microstructure. Whisker-like mullite grains evolved from the dense, equiaxed microstructure. The onset temperature was ~1500°C. Chemical leaching was employed to characterize the anisotropic grains. Growth kinetics showed that anisotropic grains followed the empirical equation Gn-Gon=Kt with n=3 and n=4 for the length and thickness directions, respectively. The activation energies for grain growth were 660kJ mol-1 for elongation and 800 kJ mol-1 for thickening.",

author = "Hong, {Seong Hyeon} and Messing, {Gary L.}",

note = "Funding Information: This research was supported by the Office of Naval Research under grant number N0001494-1-0007. The authors gratefully acknowledge financial support of the Korean Government. ",

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T1 - Anisotropic grain growth in boria-doped diphasic mullite gels

AU - Hong, Seong Hyeon

AU - Messing, Gary L.

N1 - Funding Information: This research was supported by the Office of Naval Research under grant number N0001494-1-0007. The authors gratefully acknowledge financial support of the Korean Government.

PY - 1999/4

Y1 - 1999/4

N2 - Densification and anisotropic grain growth were investigated in sol-gel derived, boria-doped diphasic mullite. Boria enhanced viscous flow densification by reducing the viscosity and also produced a fine grain microstructure. Whisker-like mullite grains evolved from the dense, equiaxed microstructure. The onset temperature was ~1500°C. Chemical leaching was employed to characterize the anisotropic grains. Growth kinetics showed that anisotropic grains followed the empirical equation Gn-Gon=Kt with n=3 and n=4 for the length and thickness directions, respectively. The activation energies for grain growth were 660kJ mol-1 for elongation and 800 kJ mol-1 for thickening.

AB - Densification and anisotropic grain growth were investigated in sol-gel derived, boria-doped diphasic mullite. Boria enhanced viscous flow densification by reducing the viscosity and also produced a fine grain microstructure. Whisker-like mullite grains evolved from the dense, equiaxed microstructure. The onset temperature was ~1500°C. Chemical leaching was employed to characterize the anisotropic grains. Growth kinetics showed that anisotropic grains followed the empirical equation Gn-Gon=Kt with n=3 and n=4 for the length and thickness directions, respectively. The activation energies for grain growth were 660kJ mol-1 for elongation and 800 kJ mol-1 for thickening.

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Anisotropic grain growth in boria-doped diphasic mullite gels

Abstract

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