Influence of surface silica impurities on the sintering behavior of alumina powders

Conference · Thu Jan 31 23:00:00 EST 1980

OSTI ID:5220984

Moya, J S; Pask, J A

The filtering, pressing and sintering behavior of an alumina powder with and without silica impurity on surface has been studied. When silica is removed from surface by HF-treatment and compactibility is considerably enhanced due to the different acidity/basicity nature of the OH of the hydroxyl layers. The silica impurity decreases the activation energy of the initial stage of sintering and grain boundary energy, improves the densification process and exerts a moderate inhibitor effect on the grain growth.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5220984
• Report Number(s): LBL-10392; CONF-800902-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ACTIVATION ENERGY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
DENSITY
ENERGY
FABRICATION
GRAIN GROWTH
IMPURITIES
MATERIALS WORKING
METALLURGICAL EFFECTS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
PRESSING
SILICON COMPOUNDS
SILICON OXIDES
SINTERING
SURFACES