Effects of TiO2 doping on the defect chemistry and thermo-physical properties of Yb2O3 stabilized ZrO2

Lei Guo; Chenglong Zhang; Luming Xu; Mingzhu Li; Qi Wang; Fuxing Ye; Chengyi Dan; Vincent Ji

doi:10.1016/j.jeurceramsoc.2017.04.065

Effects of TiO₂ doping on the defect chemistry and thermo-physical properties of Yb₂O₃ stabilized ZrO₂

Lei Guo^*
, Chenglong Zhang
, Luming Xu
, Mingzhu Li
, Qi Wang
, Fuxing Ye
, Chengyi Dan
, Vincent Ji

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

61 Citations (Scopus)

Abstract

Yb₂O₃ stabilized ZrO₂ (YbSZ) doped with different TiO₂ contents were produced, and their phase structure, thermal conductivities and thermal expansion coefficients were investigated. A new solid-solution model is proposed, i.e. Ti⁴⁺ would take the interstitial sites when its content is below a critical value (≤2.5 mol%) and then substitute for Zr⁴⁺. The abnormal lattice volume and thermo-physical properties of 2.5 mol% TiO₂ doped YbSZ, and the positive effects of TiO₂ doping on the thermal conductivity at moderate doping level are consistent with the new defect model. However, monoclinic phase is formed when the TiO₂ content reaches to 10 mol% and its content increases with doping content, which have negative influence on the thermo-physical properties. Considering the comprehensive properties, 10 mol% TiO₂ doped YbSZ is considered as a promising thermal barrier coating ceramic. © 2017 Elsevier Ltd

Original language	English
Pages (from-to)	4163-4169
Journal	Journal of the European Ceramic Society
Volume	37
Issue number	13
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2017.04.065
Publication status	Published - 1 Oct 2017
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

This research is sponsored by the National Natural Science Foundation of China (Grant Nos. 51501127 and 51375332) and the Natural Science Foundation of Tianjin (No. 16JCQNJC02900 and 16JCYBJC18700).

Research Keywords

Defect model
Phase structure
Thermal barrier coating
Thermo-physical properties

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title = "Effects of TiO2 doping on the defect chemistry and thermo-physical properties of Yb2O3 stabilized ZrO2",

abstract = "Yb2O3 stabilized ZrO2 (YbSZ) doped with different TiO2 contents were produced, and their phase structure, thermal conductivities and thermal expansion coefficients were investigated. A new solid-solution model is proposed, i.e. Ti4+ would take the interstitial sites when its content is below a critical value (≤2.5 mol\%) and then substitute for Zr4+. The abnormal lattice volume and thermo-physical properties of 2.5 mol\% TiO2 doped YbSZ, and the positive effects of TiO2 doping on the thermal conductivity at moderate doping level are consistent with the new defect model. However, monoclinic phase is formed when the TiO2 content reaches to 10 mol\% and its content increases with doping content, which have negative influence on the thermo-physical properties. Considering the comprehensive properties, 10 mol\% TiO2 doped YbSZ is considered as a promising thermal barrier coating ceramic. {\textcopyright} 2017 Elsevier Ltd",

keywords = "Defect model, Phase structure, Thermal barrier coating, Thermo-physical properties",

author = "Lei Guo and Chenglong Zhang and Luming Xu and Mingzhu Li and Qi Wang and Fuxing Ye and Chengyi Dan and Vincent Ji",

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TY - JOUR

T1 - Effects of TiO2 doping on the defect chemistry and thermo-physical properties of Yb2O3 stabilized ZrO2

AU - Guo, Lei

AU - Zhang, Chenglong

AU - Xu, Luming

AU - Li, Mingzhu

AU - Wang, Qi

AU - Ye, Fuxing

AU - Dan, Chengyi

AU - Ji, Vincent

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2017/10/1

Y1 - 2017/10/1

N2 - Yb2O3 stabilized ZrO2 (YbSZ) doped with different TiO2 contents were produced, and their phase structure, thermal conductivities and thermal expansion coefficients were investigated. A new solid-solution model is proposed, i.e. Ti4+ would take the interstitial sites when its content is below a critical value (≤2.5 mol%) and then substitute for Zr4+. The abnormal lattice volume and thermo-physical properties of 2.5 mol% TiO2 doped YbSZ, and the positive effects of TiO2 doping on the thermal conductivity at moderate doping level are consistent with the new defect model. However, monoclinic phase is formed when the TiO2 content reaches to 10 mol% and its content increases with doping content, which have negative influence on the thermo-physical properties. Considering the comprehensive properties, 10 mol% TiO2 doped YbSZ is considered as a promising thermal barrier coating ceramic. © 2017 Elsevier Ltd

AB - Yb2O3 stabilized ZrO2 (YbSZ) doped with different TiO2 contents were produced, and their phase structure, thermal conductivities and thermal expansion coefficients were investigated. A new solid-solution model is proposed, i.e. Ti4+ would take the interstitial sites when its content is below a critical value (≤2.5 mol%) and then substitute for Zr4+. The abnormal lattice volume and thermo-physical properties of 2.5 mol% TiO2 doped YbSZ, and the positive effects of TiO2 doping on the thermal conductivity at moderate doping level are consistent with the new defect model. However, monoclinic phase is formed when the TiO2 content reaches to 10 mol% and its content increases with doping content, which have negative influence on the thermo-physical properties. Considering the comprehensive properties, 10 mol% TiO2 doped YbSZ is considered as a promising thermal barrier coating ceramic. © 2017 Elsevier Ltd

KW - Defect model

KW - Phase structure

KW - Thermal barrier coating

KW - Thermo-physical properties

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U2 - 10.1016/j.jeurceramsoc.2017.04.065

DO - 10.1016/j.jeurceramsoc.2017.04.065

M3 - RGC 21 - Publication in refereed journal

SN - 0955-2219

VL - 37

SP - 4163

EP - 4169

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 13

ER -