Microstructure Characterization and Thermal Conductivity Analysis of Plasma Sprayed ZrO2 Coatings

doi:10.3724/SP.J.1077.2012.11743

Abstract

Abstract:

Yttria stabilized zirconia coatings were deposited using two different sets of parameters (N1, N2 coating). The microstructure features, such as total porosity and large porosity, were quantified by means of scanning electron microscope and image analysis. The three-dimensional distribution of microcracks and segmentation cracks was successfully revealed by the X-ray microscopy in the scanning electron microscope with three-dimensional microtomography capability. So the relationship between microstructure and thermal conductivity was found. At room temperature, thermal conductivity of N2 was lower than that of N1 due to larger pores and microcracks. At 1000℃ thermal conductivity of N1 was lower for the sintering of microcracks. The segmentation cracks formed by the propagation of microcracks could effectively reduce the thermal conductivity at high temperature.

Key words: ZrO₂ coatings, microstructure, thermal conductivity, X-ray microscopy

CLC Number:

TQ174

WANG Yong-Zhe, WU Wei, HUA Jia-Jie, ZENG Yi, ZHENG Xue-Bin, ZHOU Ying, WANG Hu. Microstructure Characterization and Thermal Conductivity Analysis of Plasma Sprayed ZrO₂ Coatings[J]. Journal of Inorganic Materials, 2012, 27(5): 550-554.

Figures/Tables 7

Table1 Parameters of plasma spray gun

Sample	Current/A	Ar/(L?min^-1)	H₂/(L?min^-1)	Spray distance/mm	Temperature/℃	Velocity/(m?s^-1)
N1	650	35	12	120	3277	201
N2	550	35	12	120	3174	182

Fig. 1 SEM images of cross section of polished coatings

Fig. 2 Volume fractions of pores in N1 and N2 coatings

Fig. 3 X-ray microscopy images of N1 coating

Fig. 4 X-ray microscopy images of N2 coating

Fig. 5 Reconstructed cross section of N1 coating

Fig. 6 Thermal conductivity of N1 and N2 coatings

References 21

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Microstructure Characterization and Thermal Conductivity Analysis of Plasma Sprayed ZrO₂ Coatings

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