Boron Suboxide Materials with Rare-earth Metal Oxide Additives

Conference proceedings article

Authors / Editors

Ogunmuyiwa, Enoch

Research Areas

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Publication Details

Author list: Johnson OT, Ogunmuyiwa EN, Sigalas I, Hermann M

Place: HONG KONG

Publication year: 2013

Journal: WORLD CONGRESS ON ENGINEERING 2009, VOLS I AND II (2078-0958)

Journal acronym: LECT NOTES ENG COMP

Start page: 501

End page: +

ISBN: 978-988-19251-0-7

ISSN: 2078-0958

Languages: English-Great Britain (EN-GB)

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Abstract

The basis of this study is that the mechanical properties of Boron suboxide (B6O) materials, especially fracture toughness are greatly influenced by the composition of the grain boundary phase and the grain size of the phases in the sintered material. Therefore, in this work, effort has been directed towards improving the fracture toughness and densification of this material by incorporating potential rare-earth oxide phases and tailoring the microstructure to the desired properties. Boron suboxide (B6O) powder was synthesized from the reaction of amorphous boron and boric acid powders. The powder was hot pressed at 1900 degrees C and 50 MPa. Additionally to pure sintered B6O, materials with rare-earth oxides were prepared at 1850 degrees C. The microstructure, phase composition and properties were investigated. More than 95% of the theoretical density was attained and fracture toughness up to 5.6 +/- 0.2 MPam(1/2) was obtained for the materials. Although the pure B6O sample was brittle, fracture toughness was strongly improved in the materials.

Keywords

Boron suboxide, Fracture toughness, Mechanical properties, Rare-earth oxide

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