Boron suboxide materials with rare-earth metal oxide additives

Oluwagbenga T. Johnson, Enoch N. Ogunmuyiwa, Iakovos Sigalas, Mathias Hermann

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

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 rareearth 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 °C and 50 MPa. Additionally to pure sintered B6O, materials with rareearth oxides were prepared at 1850°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 MPam1/2was obtained for the materials. Although the pure B6O sample was brittle, fracture toughness was strongly improved in the materials.

Original languageEnglish
Title of host publicationProceedings of the World Congress on Engineering 2013, WCE 2013
Pages501-505
Number of pages5
Volume1 LNECS
Publication statusPublished - Nov 25 2013
Event2013 World Congress on Engineering, WCE 2013 - London, United Kingdom
Duration: Jul 3 2013Jul 5 2013

Other

Other2013 World Congress on Engineering, WCE 2013
CountryUnited Kingdom
CityLondon
Period7/3/137/5/13

Fingerprint

Rare earths
Boron
Oxides
Fracture toughness
Metals
Powders
Boric acid
Microstructure
Brittle fracture
Densification
Phase composition
Grain boundaries
Mechanical properties
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Computer Science (miscellaneous)

Cite this

Johnson, O. T., Ogunmuyiwa, E. N., Sigalas, I., & Hermann, M. (2013). Boron suboxide materials with rare-earth metal oxide additives. In Proceedings of the World Congress on Engineering 2013, WCE 2013 (Vol. 1 LNECS, pp. 501-505)
Johnson, Oluwagbenga T. ; Ogunmuyiwa, Enoch N. ; Sigalas, Iakovos ; Hermann, Mathias. / Boron suboxide materials with rare-earth metal oxide additives. Proceedings of the World Congress on Engineering 2013, WCE 2013. Vol. 1 LNECS 2013. pp. 501-505
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Johnson, OT, Ogunmuyiwa, EN, Sigalas, I & Hermann, M 2013, Boron suboxide materials with rare-earth metal oxide additives. in Proceedings of the World Congress on Engineering 2013, WCE 2013. vol. 1 LNECS, pp. 501-505, 2013 World Congress on Engineering, WCE 2013, London, United Kingdom, 7/3/13.

Boron suboxide materials with rare-earth metal oxide additives. / Johnson, Oluwagbenga T.; Ogunmuyiwa, Enoch N.; Sigalas, Iakovos; Hermann, Mathias.

Proceedings of the World Congress on Engineering 2013, WCE 2013. Vol. 1 LNECS 2013. p. 501-505.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Johnson OT, Ogunmuyiwa EN, Sigalas I, Hermann M. Boron suboxide materials with rare-earth metal oxide additives. In Proceedings of the World Congress on Engineering 2013, WCE 2013. Vol. 1 LNECS. 2013. p. 501-505