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Synthesis of ultra-refractory transition metal diboride compounds

Published online by Cambridge University Press:  01 July 2016

William G. Fahrenholtz ,
Jon Binner  and
Ji Zou
William G. Fahrenholtz*
Affiliation:
Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
Jon Binner
Affiliation:
School of Metallurgy and Materials, University of Birmingham, Birmingham B15 2TT, UK
Ji Zou
Affiliation:
School of Metallurgy and Materials, University of Birmingham, Birmingham B15 2TT, UK
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

This paper critically evaluates methods used to synthesize boride compounds with emphasis on diborides of the early transition metals. The earliest reports of the synthesis of boride ceramics used impure elemental powders to produce multiphase reaction products; phase-pure borides were only synthesized after processes were established to purify elemental boron. Carbothermal reduction of the corresponding transition metal oxides emerged as a viable production route and continues to be the primary method for the synthesis of commercial transition metal diboride powders. Even though reaction-based processes and chemical synthesis methods are mainly used for research studies, they are powerful tools for producing diborides because they provide the ability to tailor purity and particle size. The choice of synthesis method requires balancing factors that include cost, purity, and particle size with the performance needed in expected applications.

Keywords

boroncompoundceramic
Type
Focus Section: Reinventing Boron Chemistry and Materials for the 21st Century
Information
Journal of Materials Research , Volume 31 , Issue 18: Focus Section: Reinventing Boron Chemistry for the 21st Century , 28 September 2016 , pp. 2757 - 2772
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Copyright
Copyright © Materials Research Society 2016 

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