Method of making highly sinterable lanthanum chromite powder
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 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. 2 figs.
- Research Organization:
- Westinghouse Electric Corp., Pittsburgh, PA (United States)
- DOE Contract Number:
- AC02-80ET17089
- Assignee:
- Westinghouse Electric Corp., Pittsburgh, PA (United States)
- Patent Number(s):
- US 5143751; A
- Application Number:
- PPN: US 7-495884
- OSTI ID:
- 7205524
- Resource Relation:
- Patent File Date: 19 Mar 1990
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sintering mechanisms and thermal expansion behavior for stoichiometric doped lanthanum chromites under reducing environment
Method and closing pores in a thermally sprayed doped lanthanum chromite interconnection layer
Related Subjects
CHROMIUM OXIDES
SYNTHESIS
LANTHANUM OXIDES
CHARS
COMMINUTION
DOPED MATERIALS
EVAPORATION
HEAT TREATMENTS
SOLUTIONS
CHALCOGENIDES
CHROMIUM COMPOUNDS
DISPERSIONS
LANTHANUM COMPOUNDS
MATERIALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PYROLYSIS PRODUCTS
RARE EARTH COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication