Mechanical Properties of sintered B60-Alkaline earth metal oxide materials

Journal article

Authors / Editors

Ogunmuyiwa, Enoch

Research Areas

ENGINEERING AND TECHNOLOGY (Frascati classification)

Publication Details

Subtitle: Mechanical Properties of sintered B60-Alkaline earth metal oxide materials

Author list: Ogunmuyiwa, Enoch

Publisher: Elsevier

Publication year: 2015

Journal: Journal of Alloys and Compounds (0925-8388)

Volume number: 2

Start page: 1

End page: 6

Number of pages: 6

ISSN: 0925-8388

URL: http://www.iaeng.org/publication/WCE2015/WCE2015_pp740-745.pdf

Languages: English-United States (EN-US)

Abstract

Pure BtO powder and B60 powders admixed with 1.5 wt% of MgO, 1.4 wt% of CaO, and 0.7 wt% of CaCOj, were sintered and the microstructure, phase composition and mechanical properties were investigated. Pure B60 powders were sintered at a temperature of 1900°C and a load of 50 MPa for 20 minutes in an argon environment, while the B60-Admixed powders were sintered at a temperature of 1850°C and loads from 50-80 MPa, under the same environment. The addition of the alkaline earth metal oxide additives resulted in the formation of boride and borate phases, depending on the oxide used. More than 96% of theoretical densities were achieved and the result indicates a good combination of hardness (between 31.6-32.1 GPa) and fracture toughness (between 6.1-6.8 MPa.m0-5) in the B60-Alkalinc earth oxide materials. The introduction of the additive enhances the improvement in the fracture toughness of the pure B60- materials. The fracture mode observed in the sintered materials is mainly transgranular.

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