Development of ZrC in the tungsten matrix composite containing Zr 2Cu and MWCNTs during liquid-reactive sintering

Beomsoo Shin, Taewoo Kang, Donghyun Bae

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Formation of ZrC during liquid-reactive sintering of the high energy ball-milled powder mixture of tungsten, Zr2Cu and multi-walled carbon nanotubes (MWCNTs) was investigated. The composite powder was compacted and sintered at 1400°C up to 12 h. During sintering, carbon atoms from the well-dispersed MWCNTs diffuse to the tungsten matrix to form WC, and Zr 2Cu liquid phase flows into fine capillaries between the tungsten particles. Carbon atoms from WC in the tungsten matrix diffuse into Zr 2Cu liquid phase and form ZrC because Gibbs free energy of ZrC formation is lower than that of WC formation. Formation of WC and ZrC was observed by the SEM microstructures of the sintered composites. The formation of carbides in the sintered composite was confirmed by FT-IR spectra and XRD analysis. The density of the sintered composite increases from 80% to 91% theoretical density, after 6 h of sintering. The hardness of the sintered composite (720 Hv) increased up to ~230% more than monolithic tungsten (310 Hv), due to the formation of ZrC and the densification of the sintered composite.

Original languageEnglish
Pages (from-to)789-799
Number of pages11
JournalInternational Journal of Nanotechnology
Volume10
Issue number8-9
DOIs
Publication statusPublished - 2013 Jun 17

Fingerprint

Carbon Nanotubes
Tungsten
Carbon nanotubes
sintering
tungsten
Sintering
carbon nanotubes
composite materials
Composite materials
Liquids
matrices
liquids
Powders
liquid phases
Carbon
Atoms
carbon
Gibbs free energy
densification
Densification

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Materials Chemistry
  • Condensed Matter Physics
  • Bioengineering

Cite this

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title = "Development of ZrC in the tungsten matrix composite containing Zr 2Cu and MWCNTs during liquid-reactive sintering",
abstract = "Formation of ZrC during liquid-reactive sintering of the high energy ball-milled powder mixture of tungsten, Zr2Cu and multi-walled carbon nanotubes (MWCNTs) was investigated. The composite powder was compacted and sintered at 1400°C up to 12 h. During sintering, carbon atoms from the well-dispersed MWCNTs diffuse to the tungsten matrix to form WC, and Zr 2Cu liquid phase flows into fine capillaries between the tungsten particles. Carbon atoms from WC in the tungsten matrix diffuse into Zr 2Cu liquid phase and form ZrC because Gibbs free energy of ZrC formation is lower than that of WC formation. Formation of WC and ZrC was observed by the SEM microstructures of the sintered composites. The formation of carbides in the sintered composite was confirmed by FT-IR spectra and XRD analysis. The density of the sintered composite increases from 80{\%} to 91{\%} theoretical density, after 6 h of sintering. The hardness of the sintered composite (720 Hv) increased up to ~230{\%} more than monolithic tungsten (310 Hv), due to the formation of ZrC and the densification of the sintered composite.",
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Development of ZrC in the tungsten matrix composite containing Zr 2Cu and MWCNTs during liquid-reactive sintering. / Shin, Beomsoo; Kang, Taewoo; Bae, Donghyun.

In: International Journal of Nanotechnology, Vol. 10, No. 8-9, 17.06.2013, p. 789-799.

Research output: Contribution to journalArticle

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