Thermophysical Properties of Ln2(Zr0.7Ce0.3)2O7 (Ln=La, Nd, Sm, Gd) Nanomaterials for Thermal Barrier Coatings

doi:10.11901/1005.3093.2023.111

Chinese Journal of Materials Research

2023, Vol. 37

Issue (11): 855-861 DOI: 10.11901/1005.3093.2023.111

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Thermophysical Properties of Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd) Nanomaterials for Thermal Barrier Coatings

WANG Yue¹, FU Boyan¹, CHEN Shuanglong¹, ZOU Binglin², WANG Chunjie¹(

)

^1.College of Physical Science and Technology, Bohai University, Jinzhou 121013, China
^2.State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Cite this article:

WANG Yue, FU Boyan, CHEN Shuanglong, ZOU Binglin, WANG Chunjie. Thermophysical Properties of Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd) Nanomaterials for Thermal Barrier Coatings. Chinese Journal of Materials Research, 2023, 37(11): 855-861.

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Abstract

Thermal barrier coatings are widely used in the protection of engine turbine blade, in this paper, Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd) nanomaterials for the applications of thermal barrier coatings were synthesized by hydrothermal method, the crystallographic structures, morphologies and related thermophysical properties of powders and their bulk materials were comparatively assessed via various techniques. The analysis results of XRD and Raman spectra indicate that La₂(Zr_0.7Ce_0.3)₂O₇, Nd₂(Zr_0.7Ce_0.3)₂O₇ and Sm₂(Zr_0.7Ce_0.3)₂O₇ are pyrochlore structures, while Gd₂(Zr_0.7Ce_0.3)₂O₇ belongs to fluorite type. The lattice parameters, average particle sizes and specific surface areas were also characterized. The volume shrinkage / relative density, the sintering-resistance properties of the four bulk materials were evaluated by SEM observation. Additionally, their thermophysical properties (such as the activation energy of crystal growth, thermal expansion coefficient, and thermal conductivity) were investigated in detail. As the ionic radii of Ln decreasing, the activation energy of crystal growth and thermal expansion coefficient of Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd) increased, however the thermal conductivity is just the opposite.

Key words: inorganic non-metallic materials thermal barrier coating materials thermophysical property activation energy of crystal growth

Received: 23 February 2023

ZTFLH:

TG174.45

Fund: National Natural Science Foundation of China(12004050);Research Foundation of the Education Department of Liaoning Province(LJKMZ20221493);Research Foundation of the Education Department of Liaoning Province(JYTMS20231624)

Corresponding Authors: WANG Chunjie, Tel: (0416)3400145, E-mail: cjwang@foxmail.com

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	WANG Yue
	FU Boyan
	CHEN Shuanglong
	ZOU Binglin
	WANG Chunjie

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.111 OR https://www.cjmr.org/EN/Y2023/V37/I11/855

Fig.1 TG-DSC curves of Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd) (a) LZC; (b) NZC; (c) SZC; (d) GZC

Fig.2 XRD patterns of Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd) calcined at different temperatures (a) LZC; (b) NZC; (c) SZC; (d) GZC

Table 1 Crystallite sizes, lattice parameters and S_BET information of Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd)

Fig.3 Raman spectra of Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd) recorded after calcined at 1450℃ (a) LZC; (b) NZC; (c) SZC; (d) GZC

Fig.4 Average crystal sizes of Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd) as a function of temperature (a) and plots of ln (D) against 1000/T (b)

Fig.5 SEM images of Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd) compacted bodies after sintered at 1450℃ (a) LZC; (b) NZC; (c) SZC; (d) GZC

Table 2 Determined values of volume shrinkage and relative density for Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd) after sintered at 1450℃

Fig.6 Thermal expansion coefficients (a) and the thermal conductivities (b) for Ln₂(Zr_0.7Ce_0.3)₂O₇ (Ln=La, Nd, Sm, Gd) as a function of temperature.

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