Boron suboxide materials with Co sintering additives

Journal article

Authors / Editors

Ogunmuyiwa, Enoch

Research Areas

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Publication Details

Author list: Johnson OT, Sigalas I, Ogunmuyiwa EN, Kleebe HJ, Muller MM, Herrmann M

Publisher: Elsevier

Place: OXFORD

Publication year: 2010

Journal: Ceramics International (0272-8842)

Journal acronym: CERAM INT

Volume number: 36

Issue number: 6

Start page: 1767

End page: 1771

Number of pages: 5

ISSN: 0272-8842

eISSN: 1873-3956

Languages: English-Great Britain (EN-GB)

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Abstract

Difficulties in the densification as well as the low fracture toughness of the resulting polycrystalline materials have delayed the application of boron suboxide as a superhard material in industry. In this work, efforts have been made to improve the fracture toughness and densification of these materials by incorporating suitable secondary phases. Possible candidates are transition metals, which form under sintering conditions a liquid phase. Therefore different Co containing additives (metal, oxide and boride) were used to densify boron suboxide powder by hot pressing. The resulting materials have a significantly improved fracture toughness (3.9 MPa m(1/2)) and still high hardness (H-v5 = 28.6 GPa.). (C) 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Keywords

Boron suboxide, Fracture toughness, Hot pressing, Superhard material

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