Mechanical Properties of Sintered B6O-Alkaline Earth Metal Oxide Materials
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Publication Details
Author list: Ogunmuyiwa EN, Johnson OT, Sigalas I, Afolabi AS
Place: HONG KONG
Publication year: 2015
Journal: WORLD CONGRESS ON ENGINEERING 2009, VOLS I AND II (2078-0958)
Journal acronym: LECT NOTES ENG COMP
Start page: 740
End page: 745
Number of pages: 6
ISBN: 978-988-14047-0-1
ISSN: 2078-0958
Languages: English-Great Britain (EN-GB)
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Abstract
Pure B6O powder and B6O powders admixed with 1.5 wt% of MgO, 1.4 wt% of CaO, and 0.7 wt% of CaCO3, were sintered and the microstructure, phase composition and mechanical properties were investigated. Pure B6O powders were sintered at a temperature of 1900 degrees C and a load of 50 MPa for 20 minutes in an argon environment, while the B6O-admixed powders were sintered at a temperature of 1850 degrees 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.m(0.5)) in the B6O-alkaline earth oxide materials. The introduction of the additive enhances the improvement in the fracture toughness of the pure B6O materials. The fracture mode observed in the sintered materials is mainly transgranular.
Keywords
Alkaline earth oxide, Boron suboxide, Fracture toughness, transgranular
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