Air-sintering mechanisms of chromites

Conference · Mon Jul 01 04:00:00 EDT 1991

OSTI ID:5494803

Chick, L A; Bates, J L; Maupin, G D

The sintering behaviors of La{sub 1-x}Sr{sub x}CrO{sub 3} and Y{sub 1-x}Ca{sub x}CrO{sub 3} in air at 1550{degrees}C are described as functions of alkaline earth concentration and chromium enrichment or depletion. Vapor-, liquid-, and solid-phase mass transport mechanisms appear to be operative in both systems. Liquid-phase sintering appears dominant an Y{sub 1-x}Ca{sub x}CrO{sub 3} with x = 0.15 to 0.40, especially with Cr enrichment. Either vapor- or solid-phase transport may dominate in the La{sub 1-x}Sr{sub x}CrO{sub 3} system. Slight depletion or enrichment of Cr in both systems has dramatic effects on air-sintered density and microstructure, probably due to modulation of vapor-phase transport and liquid-phase formation. Substantial Cr depletion enhances sintering. 10 refs., 9 figs.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5494803
• Report Number(s): PNL-SA-19212; CONF-9107106--2; ON: DE91015527
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
AIR
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHROMIUM
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
CRYSTAL STRUCTURE
ELEMENTS
FABRICATION
FLUIDS
GASES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SINTERING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
VOLATILITY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES