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

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

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

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

Chemical, Materials & Metallurgical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference 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, K_1C 4.5 MPa.m^0.5) 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 language	English
Title of host publication	World Congress on Engineering, WCE 2014
Editors	Craig Douglas, S. I. Ao, S. I. Ao, Warren S. Grundfest, Jon Burgstone, Craig Douglas, Jon Burgstone, S. I. Ao
Publisher	Newswood Limited
Pages	632-636
Number of pages	5
Volume	2
ISBN (Electronic)	9789881925374
ISBN (Print)	9789881925350
Publication status	Published - Jan 1 2014
Event	World Congress on Engineering and Computer Science 2014, WCECS 2014 - San Francisco, United States Duration: Oct 22 2014 → Oct 24 2014

Other

Other	World Congress on Engineering and Computer Science 2014, WCECS 2014
Country	United States
City	San Francisco
Period	10/22/14 → 10/24/14

All Science Journal Classification (ASJC) codes

Computer Science (miscellaneous)

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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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title = "Mechanical properties of hot-pressed boron suboxide with chromium boride additive",

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.",

author = "Ogunmuyiwa, {Enoch N.} and Johnson, {Oluwagbenga T.} and Iakovos Sigalas and Mathias Hermann and Afolabi, {Ayo S.}",

year = "2014",

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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 proceeding › Conference contribution

TY - GEN

T1 - Mechanical properties of hot-pressed boron suboxide with chromium boride additive

AU - Ogunmuyiwa, Enoch N.

AU - Johnson, Oluwagbenga T.

AU - Sigalas, Iakovos

AU - Hermann, Mathias

AU - Afolabi, Ayo S.

PY - 2014/1/1

Y1 - 2014/1/1

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

AN - SCOPUS:84918553820

SN - 9789881925350

VL - 2

SP - 632

EP - 636

BT - World Congress on Engineering, WCE 2014

A2 - Douglas, Craig

A2 - Ao, S. I.

A2 - Grundfest, Warren S.

A2 - Burgstone, Jon

A2 - Douglas, Craig

A2 - Burgstone, Jon

A2 - Ao, S. I.

PB - Newswood Limited

T2 - World Congress on Engineering and Computer Science 2014, WCECS 2014

Y2 - 22 October 2014 through 24 October 2014

ER -