Batch rotary kiln calcination of YBaCuO precursor powders
- Univ. of Houston, TX (United States). Dept. of Chemical Engineering and Texas Center of Superconductivity
Precursor powders of Y[sub 1]Ba[sub 2]Cu[sub 3]O[sub 6 + x] (123) derived from spray roasting were calcined in a batch rotary kiln. The optimum conditions were 15 min in air at temperatures between 920 and 940C for 1.5 vol% solid loading. Pure 123 was formed in a single calcination step from homogeneous, micrometer-sized precursor material containing Y[sub 2]O[sub 3], CuO, and BaCO[sub 3]. Rotation speed did not affect the product quality, but longer calcination times are needed at higher loadings. Product agglomeration increased with increasing loading and decreasing rotation speed. In nitrogen, 123 decomposed so that a pure product could not be obtained. The BaCO[sub 3] decomposition is the rate-limiting step in the calcination. The presence of Ba(NO[sub 3])[sub 2] in the precursor led to formation of intermediate phases.
- OSTI ID:
- 6300917
- Journal Information:
- Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 76:2; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
Similar Records
Method of calcining coke in a rotary kiln
Formation of Intermediate Compounds During Reduced Pressure Calcination of Y-Ba-Cu-O Precursor
Related Subjects
360601* -- Other Materials-- Preparation & Manufacture
AGGLOMERATION
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
BARIUM NITRIDES
BARIUM OXIDES
CALCINATION
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
DECOMPOSITION
ELEMENTS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
KILNS
MOTION
NITRIDES
NITROGEN
NITROGEN COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
POWDERS
PRECURSOR
PYROLYSIS
ROTATION
STAINLESS STEELS
STEELS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES