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Effect of anions on preparation of ultrafine α-Al2O3 powder
- Source :
- Journal of Central South University of Technology. 14:773-778
- Publication Year :
- 2007
- Publisher :
- Springer Science and Business Media LLC, 2007.
-
Abstract
- Ultrafine alumina power was obtained by calcining the precursor at 1 200 °C for 2 h, which was prepared by homogeneous precipitation method using aluminium salts and urea as raw materials. The effects of anions on the morphology, particle size, surface area and configuration of the precursors were studied. The results show that the reactions of urea with aluminium nitrate and aluminium chloride result in agglomerates gels with bad filtering performance, the morphology is fibrillar. Aluminium sulphate-urea reactions result in the direct formation of amorphous powders with good filtering performance, of which morphology are regular spherical particles with larger granularity and smaller surface area. The reaction of mutual compound of aluminium sulphate and aluminium nitrate with molar ratio of 40:60 with urea can produce precursor with good filtering performance, spherical morphology, and uniform granularity distribution in the particle size range of 2–3 μm.
- Subjects :
- Aluminium chloride
Materials science
Mechanical Engineering
Inorganic chemistry
chemistry.chemical_element
Aluminium nitrate
law.invention
Amorphous solid
chemistry.chemical_compound
chemistry
Mechanics of Materials
Agglomerate
Aluminium
law
medicine
Urea
General Materials Science
Calcination
Particle size
medicine.drug
Subjects
Details
- ISSN :
- 19930666 and 10059784
- Volume :
- 14
- Database :
- OpenAIRE
- Journal :
- Journal of Central South University of Technology
- Accession number :
- edsair.doi...........f4188b875ac66d6bc8c2461f28273e06