Sintering of BN/cemented carbide composites under an electric field for improved mechanical performances

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Sintering of BN/cemented carbide composites under an electric field for improved mechanical performances. / Zhang, Lin; Liu, Jian; Yang, Yi; Yang, Gang; Jiang, Kyle.

In: Materials Science and Engineering A, Vol. 761, 138018, 22.07.2019.

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@article{af8da313335d4c9f8ff3d74e062093ce,
title = "Sintering of BN/cemented carbide composites under an electric field for improved mechanical performances",
abstract = "In the present study, attempts were made to fabricate cemented carbide (WC/Co) composites toughed with cubic boron nitride (cBN) for structural applications using a field assisted sintering technique. The effects of the content of cBN and the soaking time during the sintering process on the consolidation and mechanical performance of the materials were studied. It was found that with the increase of the cBN content from 0 to 30vol%, the densification of the composites was hindered and relative density decreased from 99.5% to 92.18%. Phase transformation of the cBN to the hexagonal structure was related to the content of cBN due to the joule heat generated in the interface and tended to occur when a cBN content higher than 5vol% was incorporated and sintered for more than 8 min. Both the hardness and toughness showed considerable improvements with an introduction of 5 vol% cBN and continuous decrease with its further addition. A maximum enhancement of around 12% and 20% were achieved for the hardness and toughness respectively. A long period sintering degraded the mechanical performances of the cBN-WC/Co composites by forming the pores or holes and promoting the phase transformation of the cBN. The results obtained are expected to lay a foundation for the fast fabrication of high performance structural materials.",
keywords = "Sintering, Composites, Consolidation, Phase transformation, Properties",
author = "Lin Zhang and Jian Liu and Yi Yang and Gang Yang and Kyle Jiang",
year = "2019",
month = jul,
day = "22",
doi = "10.1016/j.msea.2019.06.028",
language = "English",
volume = "761",
journal = "Materials Science and Engineering A",
issn = "0921-5093",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Sintering of BN/cemented carbide composites under an electric field for improved mechanical performances

AU - Zhang, Lin

AU - Liu, Jian

AU - Yang, Yi

AU - Yang, Gang

AU - Jiang, Kyle

PY - 2019/7/22

Y1 - 2019/7/22

N2 - In the present study, attempts were made to fabricate cemented carbide (WC/Co) composites toughed with cubic boron nitride (cBN) for structural applications using a field assisted sintering technique. The effects of the content of cBN and the soaking time during the sintering process on the consolidation and mechanical performance of the materials were studied. It was found that with the increase of the cBN content from 0 to 30vol%, the densification of the composites was hindered and relative density decreased from 99.5% to 92.18%. Phase transformation of the cBN to the hexagonal structure was related to the content of cBN due to the joule heat generated in the interface and tended to occur when a cBN content higher than 5vol% was incorporated and sintered for more than 8 min. Both the hardness and toughness showed considerable improvements with an introduction of 5 vol% cBN and continuous decrease with its further addition. A maximum enhancement of around 12% and 20% were achieved for the hardness and toughness respectively. A long period sintering degraded the mechanical performances of the cBN-WC/Co composites by forming the pores or holes and promoting the phase transformation of the cBN. The results obtained are expected to lay a foundation for the fast fabrication of high performance structural materials.

AB - In the present study, attempts were made to fabricate cemented carbide (WC/Co) composites toughed with cubic boron nitride (cBN) for structural applications using a field assisted sintering technique. The effects of the content of cBN and the soaking time during the sintering process on the consolidation and mechanical performance of the materials were studied. It was found that with the increase of the cBN content from 0 to 30vol%, the densification of the composites was hindered and relative density decreased from 99.5% to 92.18%. Phase transformation of the cBN to the hexagonal structure was related to the content of cBN due to the joule heat generated in the interface and tended to occur when a cBN content higher than 5vol% was incorporated and sintered for more than 8 min. Both the hardness and toughness showed considerable improvements with an introduction of 5 vol% cBN and continuous decrease with its further addition. A maximum enhancement of around 12% and 20% were achieved for the hardness and toughness respectively. A long period sintering degraded the mechanical performances of the cBN-WC/Co composites by forming the pores or holes and promoting the phase transformation of the cBN. The results obtained are expected to lay a foundation for the fast fabrication of high performance structural materials.

KW - Sintering

KW - Composites

KW - Consolidation

KW - Phase transformation

KW - Properties

U2 - 10.1016/j.msea.2019.06.028

DO - 10.1016/j.msea.2019.06.028

M3 - Article

VL - 761

JO - Materials Science and Engineering A

JF - Materials Science and Engineering A

SN - 0921-5093

M1 - 138018

ER -