Preparation of plasma-sprayed 8YSZ thermal barrier coatings under orthogonal test design
YU Haiyuan1.，BIAN Qing2.，XUE Zhaolu3.
（1.Beijing Beiye Functional Materials Co., LTD., Beijing 100192, China； 2. Modern Analysis and Testing
Center, Anhui University of Technology, Maanshan 243002, China； 3.Key Laboratory of Green Fabrication and
Surface Technology of Advanced Metal Materials, Anhui University of Technology, Maanshan 243002, China）
Abstract：In order to explore the coupling effect of spraying process parameters on microstructure and mechanical
properties of coating, 8YSZ thermal barrier coating was prepared by atmospheric plasma spraying technology. The
results show that the plasma-sprayed 8YSZ coating is layered with fine columnar crystal structure between layers.
The coating is composed of t-ZrO2 and a small amount of m-ZrO2 phase. The change of spraying parameters has no
obvious effect on the phase composition. The comprehensive effect of spraying parameters on bonding strength and
porosity of thermal barrier coatings is in the order of spraying distance > power > main gas flow. The average bond‐
ing strength and porosity of 8YSZ thermal barrier coatings are 18 MPa and 11.14% with the best spraying process
parameters optimized by orthogonal experiment, among which spraying distance is 110 mm, power is 30 kW and
main gas flow is 45 L/min.
2023, Vol. 33 
