Hard polycrystalline eutectic composite prepared by spark plasma sintering

A polycrystalline eutectic B4C–TiB2 composite was prepared by spark plasma sintering. The starting eutectic powder was obtained by mechanical grinding of the directionally solidified eutectic B4C–TiB2 alloy. The microstructure of the polycrystalline composite exhibited randomly oriented eutectic gra...

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Main Authors: Grasso, Salvatore, Bogomol, I., Nishimura, T., Sakka, Y., Loboda, P., Vasylkiv, O.
Other Authors: Temasek Laboratories
Format: Article
Language:English
Published: 2013
Online Access:https://hdl.handle.net/10356/99368
http://hdl.handle.net/10220/12891
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-993682020-03-07T12:47:16Z Hard polycrystalline eutectic composite prepared by spark plasma sintering Grasso, Salvatore Bogomol, I. Nishimura, T. Sakka, Y. Loboda, P. Vasylkiv, O. Temasek Laboratories A polycrystalline eutectic B4C–TiB2 composite was prepared by spark plasma sintering. The starting eutectic powder was obtained by mechanical grinding of the directionally solidified eutectic B4C–TiB2 alloy. The microstructure of the polycrystalline composite exhibited randomly oriented eutectic grains with an average size of about 50–100 μm. Eutectic grains consisted of boron carbide matrix reinforced by titanium diboride inclusions. The secondary eutectic structure in the grain boundary is formed at sintering temperature higher than 1700 °C. XRD analysis revealed that the eutectic B4C–TiB2 composite consist mainly of B4C and TiB2 phases. The measured Vickers hardness was in the range of 32.35–54.18 GPa and the average fracture toughness of the samples was as high as 4.81 MPa m1/2. The bending strengths of the composite evaluated at room temperature and at 1600 °C were 230 and 190 MPa, respectively. 2013-08-02T04:39:42Z 2019-12-06T20:06:30Z 2013-08-02T04:39:42Z 2019-12-06T20:06:30Z 2012 2012 Journal Article Bogomol, I., Grasso, S., Nishimura, T., Sakka, Y., Loboda, P.,& Vasylkiv, O. (2012). Hard polycrystalline eutectic composite prepared by spark plasma sintering. Ceramics International, 38(5), 3947-3953. 0272-8842 https://hdl.handle.net/10356/99368 http://hdl.handle.net/10220/12891 10.1016/j.ceramint.2012.01.048 en Ceramics international
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
description A polycrystalline eutectic B4C–TiB2 composite was prepared by spark plasma sintering. The starting eutectic powder was obtained by mechanical grinding of the directionally solidified eutectic B4C–TiB2 alloy. The microstructure of the polycrystalline composite exhibited randomly oriented eutectic grains with an average size of about 50–100 μm. Eutectic grains consisted of boron carbide matrix reinforced by titanium diboride inclusions. The secondary eutectic structure in the grain boundary is formed at sintering temperature higher than 1700 °C. XRD analysis revealed that the eutectic B4C–TiB2 composite consist mainly of B4C and TiB2 phases. The measured Vickers hardness was in the range of 32.35–54.18 GPa and the average fracture toughness of the samples was as high as 4.81 MPa m1/2. The bending strengths of the composite evaluated at room temperature and at 1600 °C were 230 and 190 MPa, respectively.
author2 Temasek Laboratories
author_facet Temasek Laboratories
Grasso, Salvatore
Bogomol, I.
Nishimura, T.
Sakka, Y.
Loboda, P.
Vasylkiv, O.
format Article
author Grasso, Salvatore
Bogomol, I.
Nishimura, T.
Sakka, Y.
Loboda, P.
Vasylkiv, O.
spellingShingle Grasso, Salvatore
Bogomol, I.
Nishimura, T.
Sakka, Y.
Loboda, P.
Vasylkiv, O.
Hard polycrystalline eutectic composite prepared by spark plasma sintering
author_sort Grasso, Salvatore
title Hard polycrystalline eutectic composite prepared by spark plasma sintering
title_short Hard polycrystalline eutectic composite prepared by spark plasma sintering
title_full Hard polycrystalline eutectic composite prepared by spark plasma sintering
title_fullStr Hard polycrystalline eutectic composite prepared by spark plasma sintering
title_full_unstemmed Hard polycrystalline eutectic composite prepared by spark plasma sintering
title_sort hard polycrystalline eutectic composite prepared by spark plasma sintering
publishDate 2013
url https://hdl.handle.net/10356/99368
http://hdl.handle.net/10220/12891
_version_ 1681041760049954816