Method of making highly sinterable lanthanum chromite powder
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B05D-005/12
B05D-003/02
출원번호
US-0495884
(1990-03-19)
발명자
/ 주소
Richards Von L. (Murrysville PA) Singhal Subhash C. (Murrysville PA)
출원인 / 주소
Westinghouse Electric Corp. (Pittsburgh PA 02)
인용정보
피인용 횟수 :
25인용 특허 :
0
초록▼
A highly sinterable powder consisting essentially 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 their solutions; (3)
A highly sinterable powder consisting essentially 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 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 950C. 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 over 7 m2/g.
대표청구항▼
A method of making a highly sinterable lanthanum chromite powder containing a dopant metal, comprising the steps: (1) separately dissolving a La source, a Cr source and a source of a dopant metal selected from the group consisting of Ca, Sr, Co, Ba, Mg, and mixtures thereof, in a mixture of an acid
A method of making a highly sinterable lanthanum chromite powder containing a dopant metal, comprising the steps: (1) separately dissolving a La source, a Cr source and a source of a dopant metal selected from the group consisting of Ca, Sr, Co, Ba, Mg, and mixtures thereof, in a mixture of an acid selected from the group consisting of polycarboxylic acids, hydroxy acids and mixtures thereof, and a polyhydroxy alcohol, to form a solution of each; (2) evaporating a substantial amount of each of the solutions formed in step (1), and any precipate formed is filtered out of the solutions; (3) mixing the solutions together in the desired proportions to achieve a desired ratio of La, Cr and dopant metal, heating the solution mixture to reduce alcohol content and then further heating under a vacuum condition until esterification and polymerization occur, to form submicron polymer precipitates; (4) continuing heating the solution mixture under a vacuum condition until a foamed, porous mass of amorphous organic polymeric material forms; (5) heating the foamed amorphous polymeric material to burn off organic components and produce a hard, somewhat porous, charred material comprising La, Cr, and dopant metal; (6) grinding the somewhat porous charred material to a powder; (7) heating the somewhat porous, charred, ground powder at from 590°C. to 950°C., in a flowing atmosphere of inert gas containing from 100 ppm to 50,000 ppm O2 and less than 300 ppm CO2, for a time effective to provide a sinterable material having a high specific surface area of from 7 m2/g to 30 m2/g, consisting essentially of LaCrO3, containing from 5 weight % to 20 weight % of a chromite of the dopant metal; (8) adding the high specific surface area sinterable material solids to an aqueous solution mixture of a nitrate of Cr and a nitrate of a dopant metal selected from the group consisting of Ca, Sr, Co, Ba, Mg, and mixtures thereof, to form a slurry, where the total nitrate is added in an amount effective to provide from 3 weight % to 20 weight % dopant metal chromate upon subsequent evaporation and heating in step (11); (9) grinding the particles in the slurry to provide particles of a sinterable material having a diameter up to 3 micrometers in the slurry; (10) taking the nitrate slurry with the ground particles and simultaneously evaporating solvent and coating the particles of sinterable material with a solidified mixture of nitrates, to provide dry, coated particles; and (11) heating the dry, coated particles at a temperature effective to convert the nitrate coating to a chromate coating, where the chromate coating constitutes from 3 weight % to 20 weight % of the total weight of the coated particles, to provide a highly sinterable powder having a high specific surface area of from 7 m2/g to 30 m2/g.
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