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Development of materials for open-cycle MHD. Quarterly report for the period ending March 1984

Technical Report ·
DOI:https://doi.org/10.2172/6796144· OSTI ID:6796144
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Pacific Northwest Laboratory (PNL) is conducting a study of channel components for open-cycle, coal-fired magnetohydrodynamic (MHD) generators. Specifically, electrodes and insulators are being developed. The electrical conductivity has been measured on several compositions based on indium oxide-tin oxide (In/sub 2/O/sub 3/-SnO/sub 2/). These compositions have been studied as additives to refractory ceramic oxides to increase the low-temperature electrical conductivity. Indium oxide appears to be the main constituent required for high conductivity. The electrical conductivity of In/sub 2/O/sub 3/-SnO/sub 2/ compositions increases with increasing In/sub 2/O/sub 3/ concentration and reaches a maximum with compositions containing about 95 mo% In/sub 2/O/sub 3/. These high In/sub 2/O/sub 3/-containing compositions behave like degenerate semiconductors; the electrical conductivity decreases with increasing temperature. Three major crystallographic phases were identified for each composition, and were tested for their relative electrical conductivity and corrosion resistance to determine which phase would be most suitable for use as an additive to refractory ceramic oxides.
Research Organization:
Pacific Northwest Lab., Richland, WA (USA)
DOE Contract Number:
AC06-76RL01830
OSTI ID:
6796144
Report Number(s):
PNL-4001-7; ON: DE84017293
Country of Publication:
United States
Language:
English

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Related Subjects

30 DIRECT ENERGY CONVERSION
300104* -- MHD Generators-- Duct Engineering & Fluid Dynamics
36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360205 -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
CERAMICS
CHALCOGENIDES
COAL-FIRED MHD GENERATORS
CORROSION RESISTANCE
DIRECT ENERGY CONVERTERS
ELECTRIC CONDUCTIVITY
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ELECTRICAL PROPERTIES
ELECTRODES
EQUIPMENT
INDIUM COMPOUNDS
INDIUM OXIDES
MATERIALS
MHD CHANNELS
MHD GENERATORS
OPEN-CYCLE MHD GENERATORS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORIES
TIN COMPOUNDS
TIN OXIDES