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Mechanochemical synthesis of ReB2 powder

Published online by Cambridge University Press:  26 August 2011

Nina Orlovskaya ,
Zhilin Xie ,
Mikhail Klimov ,
Helge Heinrich ,
David Restrepo ,
Richard Blair  and
Challapalli Suryanarayana
Nina Orlovskaya*
Affiliation:
Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816
Zhilin Xie
Affiliation:
Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816
Mikhail Klimov
Affiliation:
Materials Characterization Facility, University of Central Florida, Orlando, Florida 32826
Helge Heinrich
Affiliation:
Physics Department, University of Central Florida, Orlando, Florida 32816
David Restrepo
Affiliation:
Chemistry Department, University of Central Florida, Orlando, Florida 32816
Richard Blair
Affiliation:
Chemistry Department, University of Central Florida, Orlando, Florida 32816
Challapalli Suryanarayana
Affiliation:
Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

ReB2 was recently reported to exhibit high hardness and low compressibility, which both are strong functions of its stoichiometry, namely Re to B ratio. Most of the techniques used for ReB2 synthesis reported 1:2.5 Re to B ratio because of the loss of the B during high temperature synthesis. However, as a result of B excess, the amorphous boron, located along the grain boundaries of polycrystalline ReB2, would degrade the ReB2 properties. Therefore, techniques which could allow synthesizing the stoichiometric ReB2 preferably at room temperature are in high demand. Here, we report synthesis of ReB2 powders using mechanochemical route by milling elemental crystalline Re and amorphous B powders in the SPEX 8000 high-energy ball mill for 80 h. The formation of boron and perrhenic acids are also reported after ReB2 powder was exposed to the moist air environment for a 12-month period of time.

Keywords

CeramicReB
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 21 , 14 November 2011 , pp. 2772 - 2779
Copyright
Copyright © Materials Research Society 2011

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