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Texture Development by Templated Grain Growth in Liquid‐Phase‐Sintered α‐Alumina
Author(s) -
Seabaugh Matthew M.,
Kerscht Ingrid H.,
Messing Gary L.
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02961.x
Subject(s) - grain growth , materials science , sintering , texture (cosmology) , microstructure , phase (matter) , abnormal grain growth , grain size , anisotropy , calcination , grain boundary , diffusion , metallurgy , composite material , chemical engineering , chemistry , thermodynamics , optics , catalysis , biochemistry , physics , organic chemistry , artificial intelligence , computer science , image (mathematics) , engineering
The distribution and orientation of platelet‐shaped particles of α‐alumina in a fine‐grained alumina matrix is shown to template texture development via anisotropic grain growth. The textured microstructure ranges from 4 wt% oriented platelet particles in calcined samples to nearly 100% oriented α‐Al 2 O 3 grains after sintering at 1400°C. A CaO + SiO 2 liquid phase creates favorable thermodynamic and kinetic conditions for anisotropic grain growth and grain reorientation during sintering. Important criteria for templated grain growth include (1) anisotropic crystal structure and growth, (2) high thermodynamic driving force for template grain growth, and (3) modification of diffusion in the system to continuously provide material to the anisotropically growing template grains.