Preparation of Nanoscale High-Purity α-Alumina Powders

Xiu Lan Wu; Qiang Ren; Xuan Meng He

doi:10.4028/www.scientific.net/KEM.336-338.2051

Paper Titles

Synthesis of Hollow Sphere CdSe from CdCl₂ Aqueous Solution Containing Ethylenediamine
p.2037

Preparation and Characterization of Gallium-Doped Zinc Oxide Nanopowders with High Electrical Conductivity
p.2041

Preparation of Conductive Composite Particles by Impact Coating Process
p.2044

The Preparation of Alumina Nanopowders from Solution Derived Precipitates through Polymer Gel Method
p.2047

Preparation of Nanoscale High-Purity α-Alumina Powders
p.2051

Effect of Phase of YAG Powder Synthesized by Co-Precipitation on Transparent Ceramic Sintering
p.2054

A Novel Preparation Route of YAG:Ce via Polymer Gel Precursor
p.2058

A Novel Non-Aqueous Solvent Chemical Process to Synthesize Nano-ZrO₂
p.2060

Preparation of Pottery from Shale
p.2062

HomeKey Engineering MaterialsKey Engineering Materials Vols. 336-338Preparation of Nanoscale High-Purity α-Alumina...

Preparation of Nanoscale High-Purity α-Alumina Powders

Abstract:

High-purity nanoscale α-alumina powders with high specific surface area were prepared from boehmite powders synthesized by the method of aluminium isopropoxide hydrolysis. The physiochemical transformation of boehmite powders under heat-treatment was investigated. The results showed that the reaction progress of boehmite under heat-treatment is as follows: AlO(OH) → Al2O3 (amorphous) → γ-Al2O3 → δ-Al2O3 → α-Al2O3. The phase transformation from δ-Al2O3 to α-Al2O3 begins at 1050oC, and the α-Al2O3 grains growth accelerates as temperature increases. High-purity α-Al2O3 nanometer powders with higher specific surface area can be obtained after incineration at 1100oC for 4 h.