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http://dx.doi.org/10.4150/KPMI.2021.28.4.310

Effect of Spray Angle the on Microstructure and Mechanical Properties of Y2O3 Coating Layer Manufactured by Atmospheric Plasma Spray Process  

Hwang, Yu-Jin (Department of Materials Science and Engineering, Inha University)
Kim, Kyoung-Wook (Department of Materials Science and Engineering, Inha University)
Lee, Ho-Young (EST Inc.)
Kwon, Sik-Chol (Bedell Surface Technologies)
Lee, Kee Ahn (Department of Materials Science and Engineering, Inha University)
Publication Information
Journal of Powder Materials / v.28, no.4, 2021 , pp. 310-316 More about this Journal
Abstract
The effects of different spray angles (90°, 85°, 80°) on the microstructure and mechanical properties of a Y2O3 coating layer prepared using the atmospheric plasma spray (APS) process were studied. The powders employed in this study had a spherical shape and included a cubic Y2O3 phase. The APS coating layer exhibited the same phase as the powders. Thickness values of the coating layers were 90°: 203.7 ± 8.5 ㎛, 85°: 196.4 ± 9.6 ㎛, and 80°: 208.8 ± 10.2 ㎛, and it was confirmed that the effect of the spray angle on the thickness was insignificant. The porosities were measured as 90°: 3.9 ± 0.85%, 85°: 11.4 ± 2.3%, and 80°: 12.7 ± 0.5%, and the surface roughness values were 90°: 5.9 ± 0.3 ㎛, 85°: 8.5 ± 1.1 ㎛, and 80°: 8.5 ± 0.4 ㎛. As the spray angle decreased, the porosity increased, but the surface roughness did not show a significant difference. Vickers hardness measurements revealed values of 90°: 369.2 ± 22.3, 85°: 315.8 ± 31.4, and 80°: 267.1 ± 45.1 HV. It was found that under the condition of a 90° angle with the lowest porosity exhibited the best hardness value. Based on the aforementioned results, an improved method for the APS Y2O3 coating layer was also discussed.
Keywords
$Y_2O_3$ coating; Atmospheric plasma spray; Spray angle; Microstructure; Hardness;
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