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

Patent · Fri Jan 01 00:00:00 EST 1982

OSTI ID:864268

Morgan, Peter E. D. ^[1]

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1. Thousand Oaks, CA

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

• DOE Contract Number: E(11-1)-2942
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4339511
• OSTI ID: 864268
• Country of Publication: United States
• Language: English

Related Subjects

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/