Method of making highly sinterable lanthanum chromite powder

Details Method of making highly sinterable lanthanum chromite powder Method of making highly sinterable lanthanum chromite powder

1990-03-19

1992-09-01

Lowe, James

Coating processes

Electrical product produced

Metallic compound coating

264 42, 264 60, 427215, 4273762, B05D 512, B05D 302

Patent

active

051437511

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.

REFERENCES:
patent: 4490444 (1984-12-01), Isenberg
patent: 4609562 (1986-09-01), Isenberg et al.
patent: 4631238 (1986-12-01), Ruka
patent: 4861345 (1989-08-01), Bowker et al.
Anderson, "Fabrication And Property Control of LaCrO.sub.3 Based Oxides," Materials Science Research, vol. II, Plenum Press, (1977), pp. 469-477.
Groupp et al., J. Amer. Ceram. Soc., vol. 59, No. 9-10, (1976), pp. 449-450.
Meadowcroft et al., Ceram. Bull., vol. 58, No. 6, (1979), pp. 610-615.
Eror and Anderson, Mat. Res. Soc. Symp. Proc., vol. 73, (1986), pp. 571-577.
Chick et al., Proc. 1st Intl. Symp. On Solid Oxide Fuel Cells, vol. 89-11, (1989), pp. 170-186.

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