C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
31/127, 319/92,
C04B 35/50 (2006.01) C01G 37/00 (2006.01) C04B 35/12 (2006.01) C04B 35/42 (2006.01) C04B 35/64 (2006.01) H01M 4/48 (2006.01) H01M 4/86 (2006.01) H01M 8/02 (2006.01)
Patent
CA 2031010
A highly sinterable powder consisting essential- ly of LaCrO3, 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 the 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) burn- ing 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 O2 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 aver 7 m2/g.
Richards von L.
Singhal Subhash C.
Smart & Biggar
Westinghouse Electric Corporation
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