Pore drag in alumina

Conference · Sat Oct 01 04:00:00 EDT 1988

OSTI ID:6619385

Roedel, J; Glaeser, A M

A model experiment is introduced that allows the study of pore drag and pore-boundary separation under conditions of constant density. Photolithography, ion beam etching, and hot pressing were used to generate microdesigned interfacial pore arrays, consisting of pores of controlled size and spacing, in alumina. Results from an investigation of pore drag suggest that the surface diffusivity in MgO-doped alumina exceeds that in undoped alumina by a factor of 2--9 at 1600/degree/C. The condition for pore-boundary separation was found to depend strongly on pore spacing; the influence zone of pores is several microns wide. Concurrent studies of the grain boundary mobility show that the migration rate of basal plane sapphire into undoped alumina is lower than that into MgO-doped alumina. 22 refs., 10 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6619385
• Report Number(s): LBL-25225; CONF-8805228-1; ON: DE89002956
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
DOPED MATERIALS
GRAIN BOUNDARIES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
POROSITY