| WU Zeng-rong,HU Yong-jun,DAI Ming-jiang,ZHANG Ke-jie,Kazuhiro Ogawa,XIE Ying-chun,HUANG Ren-zhong.Effect of Gas Temperature on Properties of Cold Sprayed 7075 Aluminum Alloy Coatings[J],49(1):318-325 |
| Effect of Gas Temperature on Properties of Cold Sprayed 7075 Aluminum Alloy Coatings |
| Received:July 12, 2019 Revised:January 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.01.038 |
| KeyWord:cold spray 7075 coatings gas temperature microstructure property |
| Author | Institution |
| WU Zeng-rong |
1. School of Materials and Energy, Guangdong University of Technology, Guangzhou , China; 2.National Engineering Laboratory of Modern Material Surface Engineering Technology, Key Laboratory of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| HU Yong-jun |
1. School of Materials and Energy, Guangdong University of Technology, Guangzhou , China |
| DAI Ming-jiang |
2.National Engineering Laboratory of Modern Material Surface Engineering Technology, Key Laboratory of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| ZHANG Ke-jie |
2.National Engineering Laboratory of Modern Material Surface Engineering Technology, Key Laboratory of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| Kazuhiro Ogawa |
3.Tohoku University, Sendai 980-8579, Japan |
| XIE Ying-chun |
2.National Engineering Laboratory of Modern Material Surface Engineering Technology, Key Laboratory of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| HUANG Ren-zhong |
2.National Engineering Laboratory of Modern Material Surface Engineering Technology, Key Laboratory of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
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| Abstract: |
| The work aims to study the effect of gas temperature on the properties of 7075 aluminum alloy coating in order to provide an important reference for the preparation of high performance coating. 7075 aluminum alloy coatings with large thickness were prepared on pure aluminum substrates by cold spraying technique under high working gas pressure of 5 MPa and changing working gas temperature (450, 500, 550 and 600 ℃). Microstructure and porosity of the coatings were characterized by optical microscopy (OM) and scanning electron microscopy (SEM). Hardness of the coatings was measured by Vickers microhardness. Bonding strength of the coatings was measured by tensile test method. The effect of working gas temperature on the microstructure and deposition characteristics of cold sprayed 7075 aluminum alloy coatings was studied. The working gas temperature had limited influence on the microstructure and mechanical properties of the coatings in the range of 450 ℃ to 550 ℃. When spraying gas temperature was set at 450 ℃, the porosity was 0.14%, the microhardness was 117.8HV0.1, and the bonding strength was more than 55.3 MPa. However, too high working gas temperature was not conducive to the preparation of cold sprayed 7075 aluminum alloy coatings. When the gas temperature reached 600 ℃, the porosity of the coating increased to 4.2%. 7075 aluminum alloy coatings with high density and high bonding strength can be prepared by cheap nitrogen. When gas temperature is set in the range of 450 ℃ to 550 ℃, microstructure and properties of the coatings do not change much with the gas temperature and too high temperature (600 ℃) is not beneficial to the improvement of the related properties of 7075 coatings. |
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