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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.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.

Inventors:
 [1];  [1]
  1. Murrysville, PA
Publication Date:
Research Org.:
Westinghouse Electric Corp., Pittsburgh, PA (United States)
OSTI Identifier:
868450
Patent Number(s):
US 5143751
Assignee:
Westinghouse Electric Corp. (Pittsburgh, PA)
DOE Contract Number:  
AC02-80ET17089
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; highly; sinterable; lanthanum; chromite; powder; consisting; essentially; lacro; containing; weight; 20; dopant; sr; mg; coating; chromate; forming; solution; heating; solutions; combined; desired; ratio; reduce; solvent; foamed; mass; vacuum; burning; organic; components; charred; material; grinding; char; 590; degree; 950; inert; gas; 50; 000; ppm; provide; specific; surface; particles; adding; mixture; nitrate; form; slurry; 10; freeze; spray; drying; nitrates; 11; coated; convert; combined solution; organic components; specific surface; gas containing; consisting essentially; inert gas; coated particles; lanthanum chromite; spray drying; organic component; highly sinterable; desired ratio; combined sol; /427/264/

Citation Formats

Richards, Von L, and Singhal, Subhash C. Method of making highly sinterable lanthanum chromite powder. United States: N. p., 1992. Web.
Richards, Von L, & Singhal, Subhash C. Method of making highly sinterable lanthanum chromite powder. United States.
Richards, Von L, and Singhal, Subhash C. Wed . "Method of making highly sinterable lanthanum chromite powder". United States. https://www.osti.gov/servlets/purl/868450.
@article{osti_868450,
title = {Method of making highly sinterable lanthanum chromite powder},
author = {Richards, Von L and Singhal, Subhash 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.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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

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