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Transition Metal Diborides as Electrode Material for MHD Direct Power Extraction: High-temperature Oxidation of ZrB2-HfB2 Solid Solution with LaB6 Addition

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Metallurgical and Materials Transactions E

Abstract

Transition metal borides are being considered for use as potential electrode coating materials in magnetohydrodynamic direct power extraction plants from coal-fired plasma. These electrode materials will be exposed to aggressive service conditions at high temperatures. Therefore, high-temperature oxidation resistance is an important property. Consolidated samples containing an equimolar solid solution of ZrB2-HfB2 with and without the addition of 1.8 mol pct LaB6 were prepared by ball milling of commercial boride material followed by spark plasma sintering. These samples were oxidized at 1773 K (1500 °C) in two different conditions: (1) as-sintered and (2) anodized (10 V in 0.1 M KOH electrolyte). Oxidation studies were carried out in 0.3 × 105 and 0.1 Pa oxygen partial pressures. The anodic oxide layers showed hafnium enrichment on the surface of the samples, whereas the high-temperature oxides showed zirconium enrichment. The anodized samples without LaB6 addition showed about 2.5 times higher oxidation resistance in high-oxygen partial pressures than the as-sintered samples. Addition of LaB6 improved the oxidation resistance in the as-sintered condition by about 30 pct in the high-oxygen partial pressure tests.

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Acknowledgments

The authors gratefully acknowledge the financial support from the National Energy Technology Laboratory, US Department of Energy (Office of Fossil Energy) grant number: DE-FE0022988. Laboratory help from Colin Lunstrum is also gratefully acknowledged.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, University of Idaho, Moscow, ID, 83844, USA

    Steven Sitler (Graduate Student), Cody Hill (Graduate Student), Krishnan S. Raja (Associate Professor) & Indrajit Charit (Associate Professor)

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  1. Steven Sitler
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  2. Cody Hill
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  3. Krishnan S. Raja
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  4. Indrajit Charit
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Correspondence to Steven Sitler.

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Manuscript submitted December 1, 2015.

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Sitler, S., Hill, C., Raja, K.S. et al. Transition Metal Diborides as Electrode Material for MHD Direct Power Extraction: High-temperature Oxidation of ZrB2-HfB2 Solid Solution with LaB6 Addition. Metallurgical and Materials Transactions E 3, 90–99 (2016). https://doi.org/10.1007/s40553-016-0072-2

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  • DOI: https://doi.org/10.1007/s40553-016-0072-2

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