Influence of grain boundary silica impurity on alumina toughness

Conference · Fri Aug 01 00:00:00 EDT 1980

OSTI ID:6587329

Moya, J S; Kriven, W M; Pask, J A

In a series of previous reports the effect of silica impurity on aggregation state and on electropheretic, pressing, filtering and sintering behavior on alumina powders was presented. The results obtained showed that the silica surface impurity plays an important role in the ceramic processing of powders by (a) decreasing the pH values of the isoelectric point (i.e.p.), which affects the aggregation state of the powder, and (b) decreasing the compactability and the activation energy for the initial stage of sintering. In the phase of the studies emphasis was given to the effect of the presence of silica impurity on the toughness and fracture behavior of alumina samples.

• Research Organization: Instituto de Ceramica y Vidrio, Madrid (Spain); Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6587329
• Report Number(s): LBL-12190; CONF-800765-5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
FABRICATION
FRACTURE PROPERTIES
GRAIN BOUNDARIES
IMPURITIES
MECHANICAL PROPERTIES
MICROSTRUCTURE
MINERALS
OXIDES
OXYGEN COMPOUNDS
SILICA
SILICON COMPOUNDS
SILICON OXIDES