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Title: Preparation of powders suitable for conversion to useful .beta.-aluminas

Abstract

A process for forming a precursor powder which, when suitably pressed and sintered forms highly pure, densified .beta.- or .beta."-alumina, comprising the steps of: (1) forming a suspension (or slurry) of Bayer-derived Al(OH).sub.3 in a water-miscible solvent; (2) adding an aqueous solution of a Mg compound, a Li compound, a Na compound or mixtures thereof to the Bayer-derived Al(OH).sub.3 suspension while agitating the mixture formed thereby, to produce a gel; (3) drying the gel at a temperature above the normal boiling point of water to produce a powder material; (4) lightly ball milling and sieving said powder material; and (5) heating the ball-milled and sieved powder material at a temperature of between 350.degree. to 900.degree. C. to form the .beta.- or .beta."-alumina precursor powder. The precursor powder, thus formed, may be subsequently isopressed at a high pressure and sintered at an elevated temperature to produce .beta.- or .beta."-alumina. BACKGROUND OF THE INVENTION

Inventors:
 [1]
  1. (Thousand Oaks, CA)
Issue Date:
OSTI Identifier:
864268
Patent Number(s):
4339511
Assignee:
United States of America as represented by United States (Washington, DC) OSTI
DOE Contract Number:  
E(11-1)-2942
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
preparation; powders; suitable; conversion; useful; beta; -aluminas; process; forming; precursor; powder; suitably; pressed; sintered; forms; highly; pure; densified; -alumina; comprising; steps; suspension; slurry; bayer-derived; oh; water-miscible; solvent; adding; aqueous; solution; mg; compound; na; mixtures; agitating; mixture; formed; produce; drying; temperature; normal; boiling; water; material; lightly; ball; milling; sieving; heating; ball-milled; sieved; 350; degree; 900; form; subsequently; isopressed; pressure; elevated; background; aqueous solution; elevated temperature; precursor powder; powder material; highly pure; /264/429/501/

Citation Formats

Morgan, Peter E. D. Preparation of powders suitable for conversion to useful .beta.-aluminas. United States: N. p., 1982. Web.
Morgan, Peter E. D. Preparation of powders suitable for conversion to useful .beta.-aluminas. United States.
Morgan, Peter E. D. Fri . "Preparation of powders suitable for conversion to useful .beta.-aluminas". United States. https://www.osti.gov/servlets/purl/864268.
@article{osti_864268,
title = {Preparation of powders suitable for conversion to useful .beta.-aluminas},
author = {Morgan, Peter E. D.},
abstractNote = {A process for forming a precursor powder which, when suitably pressed and sintered forms highly pure, densified .beta.- or .beta."-alumina, comprising the steps of: (1) forming a suspension (or slurry) of Bayer-derived Al(OH).sub.3 in a water-miscible solvent; (2) adding an aqueous solution of a Mg compound, a Li compound, a Na compound or mixtures thereof to the Bayer-derived Al(OH).sub.3 suspension while agitating the mixture formed thereby, to produce a gel; (3) drying the gel at a temperature above the normal boiling point of water to produce a powder material; (4) lightly ball milling and sieving said powder material; and (5) heating the ball-milled and sieved powder material at a temperature of between 350.degree. to 900.degree. C. to form the .beta.- or .beta."-alumina precursor powder. The precursor powder, thus formed, may be subsequently isopressed at a high pressure and sintered at an elevated temperature to produce .beta.- or .beta."-alumina. BACKGROUND OF THE INVENTION},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {1}
}

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