Study of the Mechanical Properties and Thermal Control Performance of Plasma-Sprayed Alumina Coating on Aluminum Alloy Surface
Thermal control coating is an important means of ensuring that a spacecraft remains operational at high temperatures. Due to limitations regarding preparation technology and material properties, the mechanical properties of the conventional thermal control coatings still need to be improved. To solv...
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| Format: | Article |
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MDPI AG
2023-01-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/2/956 |
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| author | Gengchao He Weiling Guo Dongyu He Jiaqiang Zhang Zhiguo Xing Zhenlin Lv Lei Jia Yanfei Huang |
| author_facet | Gengchao He Weiling Guo Dongyu He Jiaqiang Zhang Zhiguo Xing Zhenlin Lv Lei Jia Yanfei Huang |
| author_sort | Gengchao He |
| collection | DOAJ |
| description | Thermal control coating is an important means of ensuring that a spacecraft remains operational at high temperatures. Due to limitations regarding preparation technology and material properties, the mechanical properties of the conventional thermal control coatings still need to be improved. To solve this problem, nanostructured alumina coatings (NCs) and conventional alumina coatings (CCs) were prepared using plasma-spraying technology. The microscopic morphology, phase structure, hardness, and thermal control properties (solar absorptance (α<sub>s</sub>) and emissivity (ε)) of the nanostructured alumina coatings were investigated and compared with those of conventional alumina coatings. The results show that the NC has a higher hardness value (1168.8 HV) and that its reflectivity exceeds 75% in the wavelength range of 446–1586 nm, while a high degree of emissivity of 0.863–0.87 is still maintained at 300–393 K. Furthermore, the results show that these highly reflective properties are related to the phase composition and internal micromorphology of the NC, whereby the solar absorption of the coating is reduced due to the increase in the alpha phase content (21.4%), the high porosity (5.21%) and the nanoparticles favoring the internal scattering. All these properties can improve the performance of this CC coating with low solar absorptance (α<sub>s</sub>) and high emissivity (ε). |
| first_indexed | 2024-03-09T13:43:42Z |
| format | Article |
| id | doaj.art-da390353fda6480eba0173282f2ddceb |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T13:43:42Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-da390353fda6480eba0173282f2ddceb2023-11-30T21:04:07ZengMDPI AGApplied Sciences2076-34172023-01-0113295610.3390/app13020956Study of the Mechanical Properties and Thermal Control Performance of Plasma-Sprayed Alumina Coating on Aluminum Alloy SurfaceGengchao He0Weiling Guo1Dongyu He2Jiaqiang Zhang3Zhiguo Xing4Zhenlin Lv5Lei Jia6Yanfei Huang7School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaNational Key Lab for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, ChinaNational Key Lab for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, ChinaBeijing Spacecrafts, China Academy of Space Technology, Beijing 100094, ChinaNational Key Lab for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, ChinaSchool of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaNational Key Lab for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, ChinaThermal control coating is an important means of ensuring that a spacecraft remains operational at high temperatures. Due to limitations regarding preparation technology and material properties, the mechanical properties of the conventional thermal control coatings still need to be improved. To solve this problem, nanostructured alumina coatings (NCs) and conventional alumina coatings (CCs) were prepared using plasma-spraying technology. The microscopic morphology, phase structure, hardness, and thermal control properties (solar absorptance (α<sub>s</sub>) and emissivity (ε)) of the nanostructured alumina coatings were investigated and compared with those of conventional alumina coatings. The results show that the NC has a higher hardness value (1168.8 HV) and that its reflectivity exceeds 75% in the wavelength range of 446–1586 nm, while a high degree of emissivity of 0.863–0.87 is still maintained at 300–393 K. Furthermore, the results show that these highly reflective properties are related to the phase composition and internal micromorphology of the NC, whereby the solar absorption of the coating is reduced due to the increase in the alpha phase content (21.4%), the high porosity (5.21%) and the nanoparticles favoring the internal scattering. All these properties can improve the performance of this CC coating with low solar absorptance (α<sub>s</sub>) and high emissivity (ε).https://www.mdpi.com/2076-3417/13/2/956plasma sprayingaluminananostructuredthermal control property |
| spellingShingle | Gengchao He Weiling Guo Dongyu He Jiaqiang Zhang Zhiguo Xing Zhenlin Lv Lei Jia Yanfei Huang Study of the Mechanical Properties and Thermal Control Performance of Plasma-Sprayed Alumina Coating on Aluminum Alloy Surface Applied Sciences plasma spraying alumina nanostructured thermal control property |
| title | Study of the Mechanical Properties and Thermal Control Performance of Plasma-Sprayed Alumina Coating on Aluminum Alloy Surface |
| title_full | Study of the Mechanical Properties and Thermal Control Performance of Plasma-Sprayed Alumina Coating on Aluminum Alloy Surface |
| title_fullStr | Study of the Mechanical Properties and Thermal Control Performance of Plasma-Sprayed Alumina Coating on Aluminum Alloy Surface |
| title_full_unstemmed | Study of the Mechanical Properties and Thermal Control Performance of Plasma-Sprayed Alumina Coating on Aluminum Alloy Surface |
| title_short | Study of the Mechanical Properties and Thermal Control Performance of Plasma-Sprayed Alumina Coating on Aluminum Alloy Surface |
| title_sort | study of the mechanical properties and thermal control performance of plasma sprayed alumina coating on aluminum alloy surface |
| topic | plasma spraying alumina nanostructured thermal control property |
| url | https://www.mdpi.com/2076-3417/13/2/956 |
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