Mechanical properties of hot-pressed boron suboxide with chromium boride additive

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

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

1 Citation (Scopus)

Abstract

This study investigated and compared the mechanical properties of boron suboxide (B6O) with and without chromium bromide (CrB2) additive, hot pressed at 1900°C and 1850°C and for 20 minutes, with applied pressures of 50 and 80 MPa respectively. The theoretical density attained for these materials was More than 96%. The phase relationship, microstructures and mechanical properties of these materials were examined and good combination of mechanical properties was obtained with the B6O-CrB2 material (HV 32.1 GPa, K1C 4.5 MPa.m0.5) compared to pure B6O material. Mixing with a small amount (1.7 wt.%, equivalent of 0.4 vol.%) of CrB2 additive resulted in a pronounced improvement in both the hardness and fracture toughness values. The improvement in the fracture toughness was attributed to the introduction of the second phase and the toughening mechanism is presumed to be by crack bridging and deflection due to bimetallic stress.

Original languageEnglish
Title of host publicationWorld Congress on Engineering, WCE 2014
EditorsCraig Douglas, S. I. Ao, S. I. Ao, Warren S. Grundfest, Jon Burgstone, Craig Douglas, Jon Burgstone, S. I. Ao
PublisherNewswood Limited
Pages632-636
Number of pages5
Volume2
ISBN (Electronic)9789881925374
ISBN (Print)9789881925350
Publication statusPublished - Jan 1 2014
EventWorld Congress on Engineering and Computer Science 2014, WCECS 2014 - San Francisco, United States
Duration: Oct 22 2014Oct 24 2014

Other

OtherWorld Congress on Engineering and Computer Science 2014, WCECS 2014
CountryUnited States
CitySan Francisco
Period10/22/1410/24/14

Fingerprint

Borides
Boron
Chromium
Mechanical properties
Fracture toughness
Toughening
Hardness
Cracks
Microstructure

All Science Journal Classification (ASJC) codes

  • Computer Science (miscellaneous)

Cite this

Ogunmuyiwa, E. N., Johnson, O. T., Sigalas, I., Hermann, M., & Afolabi, A. S. (2014). Mechanical properties of hot-pressed boron suboxide with chromium boride additive. In C. Douglas, S. I. Ao, S. I. Ao, W. S. Grundfest, J. Burgstone, C. Douglas, J. Burgstone, ... S. I. Ao (Eds.), World Congress on Engineering, WCE 2014 (Vol. 2, pp. 632-636). Newswood Limited.
Ogunmuyiwa, Enoch N. ; Johnson, Oluwagbenga T. ; Sigalas, Iakovos ; Hermann, Mathias ; Afolabi, Ayo S. / Mechanical properties of hot-pressed boron suboxide with chromium boride additive. World Congress on Engineering, WCE 2014. editor / Craig Douglas ; S. I. Ao ; S. I. Ao ; Warren S. Grundfest ; Jon Burgstone ; Craig Douglas ; Jon Burgstone ; S. I. Ao. Vol. 2 Newswood Limited, 2014. pp. 632-636
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Ogunmuyiwa, EN, Johnson, OT, Sigalas, I, Hermann, M & Afolabi, AS 2014, Mechanical properties of hot-pressed boron suboxide with chromium boride additive. in C Douglas, SI Ao, SI Ao, WS Grundfest, J Burgstone, C Douglas, J Burgstone & SI Ao (eds), World Congress on Engineering, WCE 2014. vol. 2, Newswood Limited, pp. 632-636, World Congress on Engineering and Computer Science 2014, WCECS 2014, San Francisco, United States, 10/22/14.

Mechanical properties of hot-pressed boron suboxide with chromium boride additive. / Ogunmuyiwa, Enoch N.; Johnson, Oluwagbenga T.; Sigalas, Iakovos; Hermann, Mathias; Afolabi, Ayo S.

World Congress on Engineering, WCE 2014. ed. / Craig Douglas; S. I. Ao; S. I. Ao; Warren S. Grundfest; Jon Burgstone; Craig Douglas; Jon Burgstone; S. I. Ao. Vol. 2 Newswood Limited, 2014. p. 632-636.

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

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AU - Ogunmuyiwa, Enoch N.

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N2 - This study investigated and compared the mechanical properties of boron suboxide (B6O) with and without chromium bromide (CrB2) additive, hot pressed at 1900°C and 1850°C and for 20 minutes, with applied pressures of 50 and 80 MPa respectively. The theoretical density attained for these materials was More than 96%. The phase relationship, microstructures and mechanical properties of these materials were examined and good combination of mechanical properties was obtained with the B6O-CrB2 material (HV 32.1 GPa, K1C 4.5 MPa.m0.5) compared to pure B6O material. Mixing with a small amount (1.7 wt.%, equivalent of 0.4 vol.%) of CrB2 additive resulted in a pronounced improvement in both the hardness and fracture toughness values. The improvement in the fracture toughness was attributed to the introduction of the second phase and the toughening mechanism is presumed to be by crack bridging and deflection due to bimetallic stress.

AB - This study investigated and compared the mechanical properties of boron suboxide (B6O) with and without chromium bromide (CrB2) additive, hot pressed at 1900°C and 1850°C and for 20 minutes, with applied pressures of 50 and 80 MPa respectively. The theoretical density attained for these materials was More than 96%. The phase relationship, microstructures and mechanical properties of these materials were examined and good combination of mechanical properties was obtained with the B6O-CrB2 material (HV 32.1 GPa, K1C 4.5 MPa.m0.5) compared to pure B6O material. Mixing with a small amount (1.7 wt.%, equivalent of 0.4 vol.%) of CrB2 additive resulted in a pronounced improvement in both the hardness and fracture toughness values. The improvement in the fracture toughness was attributed to the introduction of the second phase and the toughening mechanism is presumed to be by crack bridging and deflection due to bimetallic stress.

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M3 - Conference contribution

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A2 - Ao, S. I.

PB - Newswood Limited

ER -

Ogunmuyiwa EN, Johnson OT, Sigalas I, Hermann M, Afolabi AS. Mechanical properties of hot-pressed boron suboxide with chromium boride additive. In Douglas C, Ao SI, Ao SI, Grundfest WS, Burgstone J, Douglas C, Burgstone J, Ao SI, editors, World Congress on Engineering, WCE 2014. Vol. 2. Newswood Limited. 2014. p. 632-636