Stability domains of (Ti,W)C and (Ti,W)(CN) during carbothermal reduction of TiO 2/WO3 mixture at 1500 K

Hanjung Kwon; Wonbaek Kim; Jiwoong Kim

doi:10.1016/j.jeurceramsoc.2016.11.008

Stability domains of (Ti,W)C and (Ti,W)(CN) during carbothermal reduction of TiO ₂/WO₃ mixture at 1500 K

Hanjung Kwon
, Wonbaek Kim
, Jiwoong Kim^*

^*Corresponding author for this work

Metallurgical System Engineering

Korea Institute of Geoscience and Mineral Resources
University of Science and Technology UST

Research output: Contribution to journal › Journal article › peer-review

7 Scopus citations

Abstract

Phase stability diagrams for the carbothermal reduction of a mixture of TiO₂ and WO₃ at 1500 K were constructed as a function of the carbon activity, oxygen pressure and characteristics of solution formation. Through this, it was found that the stable domains of carbides/carbonitrides, including (Ti,W)C/(Ti,W)(CN), are larger than the phases that are formed when solid-solution phases are not considered due to their greater stability. The use of a nitrogen atmosphere instead of vacuum expanded the stable domains of the solid-solution phases, indicating that they are made more stable under these conditions. Using these stability diagrams, the reaction sequence of carbothermal reduction can be predicted, and so this study can provide a guideline for preparing tougher carbide/carbonitride (Ti,W)C/(Ti,W)(CN) phases from TiO₂/WO₃ mixtures.

Original language	English
Pages (from-to)	1355-1371
Number of pages	17
Journal	Journal of the European Ceramic Society
Volume	37
Issue number	4
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2016.11.008
State	Published - 2017.04.1

Keywords

Ceramics
Phase diagrams
Stability domain
Thermodynamics
Titanium carbonitride

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10.1016/j.jeurceramsoc.2016.11.008

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title = "Stability domains of (Ti,W)C and (Ti,W)(CN) during carbothermal reduction of TiO 2/WO3 mixture at 1500 K",

abstract = "Phase stability diagrams for the carbothermal reduction of a mixture of TiO2 and WO3 at 1500 K were constructed as a function of the carbon activity, oxygen pressure and characteristics of solution formation. Through this, it was found that the stable domains of carbides/carbonitrides, including (Ti,W)C/(Ti,W)(CN), are larger than the phases that are formed when solid-solution phases are not considered due to their greater stability. The use of a nitrogen atmosphere instead of vacuum expanded the stable domains of the solid-solution phases, indicating that they are made more stable under these conditions. Using these stability diagrams, the reaction sequence of carbothermal reduction can be predicted, and so this study can provide a guideline for preparing tougher carbide/carbonitride (Ti,W)C/(Ti,W)(CN) phases from TiO2/WO3 mixtures.",

keywords = "Ceramics, Phase diagrams, Stability domain, Thermodynamics, Titanium carbonitride",

author = "Hanjung Kwon and Wonbaek Kim and Jiwoong Kim",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier Ltd",

year = "2017",

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doi = "10.1016/j.jeurceramsoc.2016.11.008",

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TY - JOUR

T1 - Stability domains of (Ti,W)C and (Ti,W)(CN) during carbothermal reduction of TiO 2/WO3 mixture at 1500 K

AU - Kwon, Hanjung

AU - Kim, Wonbaek

AU - Kim, Jiwoong

PY - 2017/4/1

Y1 - 2017/4/1

N2 - Phase stability diagrams for the carbothermal reduction of a mixture of TiO2 and WO3 at 1500 K were constructed as a function of the carbon activity, oxygen pressure and characteristics of solution formation. Through this, it was found that the stable domains of carbides/carbonitrides, including (Ti,W)C/(Ti,W)(CN), are larger than the phases that are formed when solid-solution phases are not considered due to their greater stability. The use of a nitrogen atmosphere instead of vacuum expanded the stable domains of the solid-solution phases, indicating that they are made more stable under these conditions. Using these stability diagrams, the reaction sequence of carbothermal reduction can be predicted, and so this study can provide a guideline for preparing tougher carbide/carbonitride (Ti,W)C/(Ti,W)(CN) phases from TiO2/WO3 mixtures.

AB - Phase stability diagrams for the carbothermal reduction of a mixture of TiO2 and WO3 at 1500 K were constructed as a function of the carbon activity, oxygen pressure and characteristics of solution formation. Through this, it was found that the stable domains of carbides/carbonitrides, including (Ti,W)C/(Ti,W)(CN), are larger than the phases that are formed when solid-solution phases are not considered due to their greater stability. The use of a nitrogen atmosphere instead of vacuum expanded the stable domains of the solid-solution phases, indicating that they are made more stable under these conditions. Using these stability diagrams, the reaction sequence of carbothermal reduction can be predicted, and so this study can provide a guideline for preparing tougher carbide/carbonitride (Ti,W)C/(Ti,W)(CN) phases from TiO2/WO3 mixtures.

KW - Ceramics

KW - Phase diagrams

KW - Stability domain

KW - Thermodynamics

KW - Titanium carbonitride

UR - https://www.scopus.com/pages/publications/85006274791

U2 - 10.1016/j.jeurceramsoc.2016.11.008

DO - 10.1016/j.jeurceramsoc.2016.11.008

M3 - Journal article

AN - SCOPUS:85006274791

SN - 0955-2219

VL - 37

SP - 1355

EP - 1371

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 4

ER -

Stability domains of (Ti,W)C and (Ti,W)(CN) during carbothermal reduction of TiO ₂/WO₃ mixture at 1500 K

Abstract

Keywords

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