skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Method of making highly sinterable lanthanum chromite powder

Abstract

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[supmore » 2]/g. 2 figs.« less

Inventors:
;
Issue Date:
Research Org.:
Westinghouse Electric Corp
OSTI Identifier:
7205524
Patent Number(s):
5143751 A
Application Number:
PPN: US 7-495884
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (United States) NETL; EDB-94-089023
DOE Contract Number:  
AC02-80ET17089
Resource Type:
Patent
Resource Relation:
Patent File Date: 19 Mar 1990
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 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

Citation Formats

Richards, V.L., and Singhal, S.C. Method of making highly sinterable lanthanum chromite powder. United States: N. p., 1992. Web.
Richards, V.L., & Singhal, S.C. Method of making highly sinterable lanthanum chromite powder. United States.
Richards, V.L., and Singhal, S.C. Tue . "Method of making highly sinterable lanthanum chromite powder". United States.
@article{osti_7205524,
title = {Method of making highly sinterable lanthanum chromite powder},
author = {Richards, V.L. and Singhal, S.C.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {9}
}