Pore drag and pore-boundary separation in alumina

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb06453.x· OSTI ID:5057471

Rodel, J; Glaeser, A M ^[1]

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1. Materials and Chemical Sciences Div., Lawrence Berkeley Lab., Berkeley, CA (US)

Microdesigned interfacial pore structures were used to study pore drag and pore-boundary separation in Al{sub 2}O{sub 3}. This approach allows the creation of pore arrays containing pores of controlled size and spacing at well-defined single-crystal seed/polycrystalline matrix interfaces, and enables experimental determination of the peak pore velocity. From the peak pore velocity, values of the surface diffusion coefficient pertinent to sintering can be extracted. At 1600{degrees}C, the surface diffusion coefficient is {approx}1 {times} 10{sup {minus}7} cm{sup 2}/s for undoped Al{sub 2}O{sub 3} and {approx}4 {times} 10{sup {minus}7} cm{sup 2}/s for MgO-doped Al{sub 2}O{sub 3}. The values appear to be insensitive to the seed orientation for the two seed orientations studied. The results suggest a strong influence of pore spacing on the separation condition in undoped Al{sub 2}O{sub 3}. Quantitative agreement between theoretically predicted and experimentally observed separation/attachment conditions was obtained.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5057471
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 73:11; ISSN 0002-7820; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTALS
DIFFUSION
DOPED MATERIALS
FABRICATION
GRAIN GROWTH
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
POROUS MATERIALS
SINTERING