| PANG Ming,ZHANG Xiao-han,LIU Guang.Effects of Scanning Speed of Spraying Gun on Temperature Field of Mo/8YSZ Gradient Thermal Barrier Coatings by Plasma Spraying[J],48(9):193-203 |
| Effects of Scanning Speed of Spraying Gun on Temperature Field of Mo/8YSZ Gradient Thermal Barrier Coatings by Plasma Spraying |
| Received:January 08, 2019 Revised:September 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.09.021 |
| KeyWord:plasma spraying gradient thermal barrier coating scanning speed of spraying gun temperature field numerical simulation |
| Author | Institution |
| PANG Ming |
1.Airport College, Civil Aviation University of China, Tianjin , China |
| ZHANG Xiao-han |
1.Airport College, Civil Aviation University of China, Tianjin , China |
| LIU Guang |
2.Ningbo Branch of Chinese Academy of Ordnance Science, Ningbo , China |
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| Abstract: |
| The paper aims to break through the technical bottleneck of the new dynamic thermal barrier coatings which is easy to peel off at high temperature, and reveal the rule on influences of scanning speed of plasma spraying gun on temperature distribution of gradient thermal barrier coatings. A temperature field simulation model of Mo/8YSZ gradient thermal barrier coatings by plasma spraying was established by using ANSYS finite element simulation software, and the variation of thermal property parameters with temperature and latent heat of the material were considered in this model. When the scanning speed of the spraying gun was increased from 550 mm/s to 1000 mm/s, the time of interaction between the gun and the substrate or the deposited coatings was shortened. Under the combined effects of thermal conduction of spraying component and convection heat transfer between spraying component and external environment, the highest temperature of spraying component was decreased from 475 ℃ to 371 ℃, and the maximum temperature gradient in the direction of thickness of coatings was decreased from 2.15×107 ℃/m to 2.05×107 ℃/m. Due to temperature, temperature gradient and plasma spraying component jet heat source used for powder particles directly in proportion to the temperature rise were closely related to the thermal and physical parameters of the material, at the end of spraying, the maximum temperature of each part of the spraying component and the maximum temperature gradient in the thickness direction of coatings presented the distribution law of the highest ceramic layer, the transition layer and the lowest bonding layer. In the process of plasma spraying, the coating deposited first had a preheating effect on the coating deposited later. Therefore, the maximum temperature of spraying component was increased with the increase of coating thickness. Therefore, by improving the spray gun scanning speed in the process of plasma spraying, the highest temperature of coatings can be sacrificed to reduce the maximum temperature gradient. At the same time, the gradient structure of thermal barrier coatings can realize continuous gradient change of material thermal property parameters in the direction of coating thickness, and then effectively control the temperature distribution of spraying component space. |
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