Evaluation of thermal conductivity of thermal barrier coating by a laser flash method and a differential scanning calorimeter

TiO2 was doped into Er2O3-stabilized ZrO2 (ErSZ) to obtain desirable properties for thermal barrier coating (TBC) applications. The phase composition, thermal conductivity, and mechanical properties of TiO2-doped ErSZ were investigated. ErSZ had a non-transformable metastable tetragonal (t′) phase, the compound with 5 mol % TiO2 consisted of t′ and cubic (c) phases, while 10 mol % TiO2 doped ErSZ had t′, c, and about 3.5 mol % monoclinic (m) phases. Higher TiO2 doping contents caused more m phase, and the compounds were composed of t′ and m phases. When the dopant content was below 10 mol %, TiO2 doping could decrease the thermal conductivity and enhance the toughness of the compounds. At higher doping levels, the compounds exhibited an increased thermal conductivity and a reduction in the toughness, mainly attribable to the formation of the undesirable m phase. Hence, 10 mol % TiO2-doped ErSZ could be a promising candidate for TBC applications.

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Enhanced anti-deliquescent property and ultralow thermal conductivity of magnetoplumbite-type LnMeAl11 O19 materials for thermal barrier coating

Journal of the American Ceramic Society ◽

10.1111/jace.15285 ◽

2017 ◽

Vol 101 (3) ◽

pp. 1095-1104 ◽

Cited By ~ 6

Author(s):

Chang-An Wang ◽

Haoran Lu ◽

Zeya Huang ◽

Huimin Xie

Keyword(s):

Thermal Conductivity ◽

Thermal Barrier Coating ◽

Thermal Barrier ◽

Barrier Coating

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High-entropy pyrochlores with low thermal conductivity for thermal barrier coating materials

Journal of Advanced Ceramics ◽

10.1007/s40145-019-0342-4 ◽

2019 ◽

Vol 8 (4) ◽

pp. 576-582 ◽

Cited By ~ 39

Author(s):

Fei Li ◽

Lin Zhou ◽

Ji-Xuan Liu ◽

Yongcheng Liang ◽

Guo-Jun Zhang

Keyword(s):

Thermal Conductivity ◽

Thermal Barrier Coating ◽

Thermal Barrier ◽

Coating Materials ◽

Low Thermal Conductivity ◽

High Entropy ◽

Barrier Coating

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Sintering Behavior of Plasma-Sprayed Sm2Zr2O7 Coating

Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Education; Electric Power; Manufacturing Materials and Metallurgy ◽

10.1115/gt2010-23809 ◽

2010 ◽

Author(s):

Jianhua Yu ◽

Huayu Zhao ◽

Shunyan Tao ◽

Xiaming Zhou ◽

Chuanxian Ding

Keyword(s):

Thermal Conductivity ◽

Thermal Expansion ◽

High Temperature ◽

Thermal Expansion Coefficient ◽

Thermal Barrier Coating ◽

Expansion Coefficient ◽

Sintering Behavior ◽

Thermal Barrier ◽

Barrier Coating ◽

Plasma Sprayed

Plasma-sprayed thermal barrier coating (TBC) systems are widely used in gas turbine blades to increase turbine entry temperature (TET) and better efficiency. Yttria stabilized zirconia (YSZ) has been the conventional thermal barrier coating material because of its low thermal conductivity, relative high thermal expansion coefficient and good corrosion resistance. However the YSZ coatings can hardly fulfill the harsh requirements in future for higher reliability and the lower thermal conductivity at higher temperatures. Among the interesting TBC candidates, materials with pyrochlore structure show promising thermo-physical properties for use at temperatures exceeding 1200 °C. Sm2Zr2O7 bulk material does not only have high temperature stability, sintering resistance but also lower thermal conductivity and higher thermal expansion coefficient. The sintering characteristics of ceramic thermal barrier coatings under high temperature conditions are complex phenomena. In this paper, samarium zirconate (Sm2Zr2O7, SZ) powder and coatings were prepared by solid state reaction and atmosphere plasma spraying process, respectively. The microstructure development of coatings derived from sintering after heat-treated at 1200–1500 °C for 50 h have been investigated. The microstructure was examined by scanning electron microscopy (SEM) and the grain growth was analyzed in this paper as well.

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