Texture development by templated grain growth in liquid-phase-sintered {alpha}-alumina

Journal Article · Thu May 01 04:00:00 EDT 1997 · Journal of the American Ceramic Society

OSTI ID:512056

Seabaugh, M M; Kerscht, I H; Messing, G L ^[1]

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1. Pennsylvania State Univ., University Park, PA (United States)

The distribution and orientation of platelet-shaped particles of {alpha}-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 {alpha}-Al{sub 2}O{sub 3} grains after sintering at 1,400 C. A CaO + SiO{sub 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.

• Sponsoring Organization: Office of Naval Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• OSTI ID: 512056
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CALCIUM OXIDES
CERAMICS
GRAIN GROWTH
ORIENTATION
SILICON OXIDES
SINTERING
TEXTURE