Thermochemical model on the carbothermal reduction of oxides during spark plasma sintering of zirconium diboride

David Pham; Joseph H. Dycus; James M. Lebeau; Venkateswara R. Manga; Krishna Muralidharan; Erica L. Corral

doi:10.1111/jace.15911

Thermochemical model on the carbothermal reduction of oxides during spark plasma sintering of zirconium diboride

David Pham, Joseph H. Dycus, James M. Lebeau, Venkateswara R. Manga, Krishna Muralidharan, Erica L. Corral

Materials Science and Engineering

Research output: Contribution to journal › Article

2 Scopus citations

Abstract

Carbon was used to reduce oxides in spark plasma sintered ZrB ₂ ultra‐high temperature ceramics. A thermodynamic model was used to evaluate the reducing reactions to remove B ₂ O ₃ and ZrO ₂ from the powder. Powder oxygen content was measured and carbon additions of 0.5 and 0.75 wt% were used. A C-ZrO ₂ pseudo binary diagram, ZrO ₂ -B2O ₃ -C pseudo ternaries, and Zr-C-O potential phase diagrams were generated to show how the reactions can be related to an open system experiment in the tube furnace. Scanning transmission electron microscopy identified impurity phases composed of amorphous Zr-B-O with lamellar BN and a Zr-C-O ternary model was calculated under SPS sintering conditions at 1900°C and 6 Pa to understand how oxides can be retained in the microstructure.

Original language	English (US)
Journal	Journal of the American Ceramic Society
Volume	102
Issue number	2
DOIs	https://doi.org/10.1111/jace.15911
State	Published - Jan 1 2018

Keywords

Field Assisted Sintering Technology (FAST)
Phase diagrams
Spark plasma sintering
Ultra-high temperature ceramics

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1111/jace.15911

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Pham, D., Dycus, J. H., Lebeau, J. M., Manga, V. R., Muralidharan, K., & Corral, E. L. (2018). Thermochemical model on the carbothermal reduction of oxides during spark plasma sintering of zirconium diboride. Journal of the American Ceramic Society, 102(2). https://doi.org/10.1111/jace.15911

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title = "Thermochemical model on the carbothermal reduction of oxides during spark plasma sintering of zirconium diboride",

abstract = " Carbon was used to reduce oxides in spark plasma sintered ZrB 2 ultra‐high temperature ceramics. A thermodynamic model was used to evaluate the reducing reactions to remove B 2 O 3 and ZrO 2 from the powder. Powder oxygen content was measured and carbon additions of 0.5 and 0.75 wt% were used. A C-ZrO 2 pseudo binary diagram, ZrO 2 -B2O 3 -C pseudo ternaries, and Zr-C-O potential phase diagrams were generated to show how the reactions can be related to an open system experiment in the tube furnace. Scanning transmission electron microscopy identified impurity phases composed of amorphous Zr-B-O with lamellar BN and a Zr-C-O ternary model was calculated under SPS sintering conditions at 1900°C and 6 Pa to understand how oxides can be retained in the microstructure. ",

keywords = "Field Assisted Sintering Technology (FAST), Phase diagrams, Spark plasma sintering, Ultra-high temperature ceramics",

author = "David Pham and Dycus, {Joseph H.} and Lebeau, {James M.} and Manga, {Venkateswara R.} and Krishna Muralidharan and Corral, {Erica L.}",

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AU - Pham, David

AU - Dycus, Joseph H.

AU - Lebeau, James M.

AU - Manga, Venkateswara R.

AU - Muralidharan, Krishna

AU - Corral, Erica L.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Carbon was used to reduce oxides in spark plasma sintered ZrB 2 ultra‐high temperature ceramics. A thermodynamic model was used to evaluate the reducing reactions to remove B 2 O 3 and ZrO 2 from the powder. Powder oxygen content was measured and carbon additions of 0.5 and 0.75 wt% were used. A C-ZrO 2 pseudo binary diagram, ZrO 2 -B2O 3 -C pseudo ternaries, and Zr-C-O potential phase diagrams were generated to show how the reactions can be related to an open system experiment in the tube furnace. Scanning transmission electron microscopy identified impurity phases composed of amorphous Zr-B-O with lamellar BN and a Zr-C-O ternary model was calculated under SPS sintering conditions at 1900°C and 6 Pa to understand how oxides can be retained in the microstructure.

AB - Carbon was used to reduce oxides in spark plasma sintered ZrB 2 ultra‐high temperature ceramics. A thermodynamic model was used to evaluate the reducing reactions to remove B 2 O 3 and ZrO 2 from the powder. Powder oxygen content was measured and carbon additions of 0.5 and 0.75 wt% were used. A C-ZrO 2 pseudo binary diagram, ZrO 2 -B2O 3 -C pseudo ternaries, and Zr-C-O potential phase diagrams were generated to show how the reactions can be related to an open system experiment in the tube furnace. Scanning transmission electron microscopy identified impurity phases composed of amorphous Zr-B-O with lamellar BN and a Zr-C-O ternary model was calculated under SPS sintering conditions at 1900°C and 6 Pa to understand how oxides can be retained in the microstructure.

KW - Field Assisted Sintering Technology (FAST)

KW - Phase diagrams

KW - Spark plasma sintering

KW - Ultra-high temperature ceramics

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