Development, testing, and evaluation of MHD materials and component designs. Quarterly report, January 1--March 31, 1977

Technical Report · Fri Apr 01 04:00:00 EST 1977

DOI:https://doi.org/10.2172/5380389· OSTI ID:5380389

Sadler, J. W.; Young, W. E.; Codoff, L. H.; Dilmore, J. A.; Kochka, E. L.; Kuszyk, J. A.; Lempert, J.; Rossing, B. R.; Schneider, S. J.; Turner, A. B.

Efforts during this quarter were directed toward the design, fabrication and testing of ceramic MHD electrodes for both clean fuel and coal fired environments. Electrodes were fabricated and tested at MIT under U-25 conditions. A Phase III U-02 electrode module has been identified. The upgraded Materials Test Facility (MTF), without oxygen, has been completed and is ready for checkout tests. A number of oxide ceramics have been tested in laboratory slag-seed corrosion tests as potential electrode and insulator materials. Tests on electrode materials have also included the flow of direct current through electrode materials. These screening tests, conducted with both Eastern and and Western coal slags, indicate that MgAL/sub 2/O/sub 4/ (spinel) has the highest resistance to slag-seed reactions for insulator materials. Iron oxide doped MgAl/sub 2/O/sub 4/ spinel also demonstrated the most promise of any ceramic anode tested. Electrolytic corrosion of ceramic cathodes produced recession rates an order of magnitude larger than that for anodes. Overall, these tests indicate that electrode materials must be evaluated under simulated electrochemical conditions and that performance of materials in slagging coal fired generator tests cannot be fully understood unless electrochemistry is considered. Resistivity measurements on MgO . Cr/sub 2/O/sub 3/ compositions indicate their promise as candidate MHD electrodes in a coal-fired channel.

• Research Organization: Westinghouse Electric Corp., Pittsburgh, Pa. (USA). Advanced Energy Systems Div.
• DOE Contract Number: EX-76-C-01-2248
• OSTI ID: 5380389
• Report Number(s): FE-2248-14
• Country of Publication: United States
• Language: English

Related Subjects

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360205 -- Ceramics
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ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMATES
CHROMIUM COMPOUNDS
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COORDINATED RESEARCH PROGRAMS
CORROSION
DIRECT ENERGY CONVERTERS
ELECTRIC CONDUCTIVITY
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CORROSION
ELECTRODES
EQUIPMENT
EUROPE
LANTHANUM COMPOUNDS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
MATERIALS TESTING
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NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
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SLAGS
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TIN COMPOUNDS
TIN OXIDES
TRANSITION ELEMENT COMPOUNDS
USA
USSR