Method of making highly sinterable lanthanum chromite powder
- Murrysville, PA
A highly sinterable powder consisting essentially of LaCrO.sub.3, containing from 5 weight % to 20 weight % of a chromite of dopant Ca, Sr, Co, Ba, or Mg and a coating of a chromate of dopant Ca, Sr, Co, Ba, or Mg; is made by (1) forming a solution of La, Cr, and dopant; (2) heating their solutions; (3) forming a combined solution having a desired ratio of La, Cr, and dopant and heating to reduce solvent; (4) forming a foamed mass under vacuum; (5) burning off organic components and forming a charred material; (6) grinding the charred material; (7) heating the char at from 590.degree. C. to 950 C. in inert gas containing up to 50,000 ppm O.sub.2 to provide high specific surface area particles; (8) adding that material to a mixture of a nitrate of Cr and dopant to form a slurry; (9) grinding the particles in the slurry; (10) freeze or spray drying the slurry to provide a coating of nitrates on the particles; and (11) heating the coated particles to convert the nitrate coating to a chromate coating and provide a highly sinterable material having a high specific surface area of over 7 m.sup.2 /g.
- Research Organization:
- Westinghouse Electric Corp
- DOE Contract Number:
- AC02-80ET17089
- Assignee:
- Westinghouse Electric Corp. (Pittsburgh, PA)
- Patent Number(s):
- US 5143751
- OSTI ID:
- 868450
- Country of Publication:
- United States
- Language:
- English
Densification of La1-xSixCrO3
|
journal | September 1976 |
Polymeric Precursor Synthesis of Ceramic Materials
|
journal | January 1986 |
Fabrication and Property Control of LaCro3 Based Oxides
|
book | January 1978 |
Similar Records
Method and closing pores in a thermally sprayed doped lanthanum chromite interconnection layer
Method of forming a plasma sprayed interconnection layer on an electrode of an electrochemical cell
Related Subjects
000
10
11
20
50
590
950
adding
burning
char
charred
chromate
chromite
coated
coated particles
coating
combined
combined sol
combined solution
components
consisting
consisting essentially
containing
convert
degree
desired
desired ratio
dopant
drying
essentially
foamed
form
forming
freeze
gas
gas containing
grinding
heating
highly
highly sinterable
inert
inert gas
lacro
lanthanum
lanthanum chromite
mass
material
method
mg
mixture
nitrate
nitrates
organic
organic component
organic components
particles
powder
ppm
provide
ratio
reduce
sinterable
slurry
solution
solutions
solvent
specific
specific surface
spray
spray drying
sr
surface
vacuum
weight