Journal of Materials Research

Articles

Mechanochemical synthesis of ReB2 powder

Nina Orlovskayaa1 c1, Zhilin Xiea1, Mikhail Klimova2, Helge Heinricha3, David Restrepoa4, Richard Blaira4 and Challapalli Suryanarayanaa5

a1 Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816

a2 Materials Characterization Facility, University of Central Florida, Orlando, Florida 32826

a3 Physics Department, University of Central Florida, Orlando, Florida 32816

a4 Chemistry Department, University of Central Florida, Orlando, Florida 32816

a5 Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816

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.

(Received May 24 2011)

(Accepted July 19 2011)

Key Words:

  • Ceramic;
  • Re;
  • B

Correspondence:

c1 Address all correspondence to this author. e-mail: norlovsk@mail.ucf.edu

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