Development of electrodes based on yttrium chromites and rare earth doped hafnia for MHD generator applications

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Yttrium chromites are being studied as potential high temperature electrodes for MHD. Like lanthanum chromites, the doped yttrium chromites have similar high electrical conductivity, predominantly electronic over a wide temperature range; however, they do not form hydroscopic decomposition products, which cause gross structural degradation. In addition, they exhibit substantially improved resistance to electrochemical attack by slag/seed. The electrical conductivity, thermal diffusivity/conductivity, melting points, thermal expansion, vaporization and electrochemical corrosion for several yttrium chromite compositions are reported and compared with analogous lanthanum chromites. Hafnium oxide containing rare earth additions are also being studied as potential high temperature MHD electrodes. The electrode ... continued below

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Pages: 8

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Marchant, D. D. & Bates, J. L. October 1, 1979.

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  • Pacific Northwest Laboratory
    Publisher Info: Battelle Pacific Northwest Labs., Richland, WA (USA)
    Place of Publication: Richland, Washington

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Description

Yttrium chromites are being studied as potential high temperature electrodes for MHD. Like lanthanum chromites, the doped yttrium chromites have similar high electrical conductivity, predominantly electronic over a wide temperature range; however, they do not form hydroscopic decomposition products, which cause gross structural degradation. In addition, they exhibit substantially improved resistance to electrochemical attack by slag/seed. The electrical conductivity, thermal diffusivity/conductivity, melting points, thermal expansion, vaporization and electrochemical corrosion for several yttrium chromite compositions are reported and compared with analogous lanthanum chromites. Hafnium oxide containing rare earth additions are also being studied as potential high temperature MHD electrodes. The electrode compositions show a high resistance to electrochemical corrosion in slag/seed. Hafnia-rare earth-M/sub 2/O/sub 3/ oxides can be fabricated with sufficient room temperature electrical conductivity to make them candidates for ceramic-to-metal current leadouts. Electrochemical tests of ceramic current leadout: ceramic electrode couples have been conducted at high temperatures and with high current densities for long periods of time with little interaction between the electrodes and leadouts.

Physical Description

Pages: 8

Notes

Dep. NTIS, PC A02/MF A01.

Source

  • 18. symposium on engineering aspects of magnetohydrodynamics, Butte, MT, USA, 18 Jun 1979

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  • Report No.: PNL-SA-7620
  • Report No.: CONF-790640-9
  • Grant Number: EY-76-C-06-1830
  • Office of Scientific & Technical Information Report Number: 5680800
  • Archival Resource Key: ark:/67531/metadc1093955

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 1979

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

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  • April 19, 2018, 6:56 p.m.

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Marchant, D. D. & Bates, J. L. Development of electrodes based on yttrium chromites and rare earth doped hafnia for MHD generator applications, article, October 1, 1979; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1093955/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.