| WANG Zhong-xun,ZHANG Shu-ai,XING Qin,YU Ren-ping,GONG Xiao-feng,XIAO Feng-yan,WANG Hao.Microstructure and Properties of Al-Cu-Fe Quasicrystal Coating Prepared by Explosive Spraying[J],52(3):197-206 |
| Microstructure and Properties of Al-Cu-Fe Quasicrystal Coating Prepared by Explosive Spraying |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.03.017 |
| KeyWord:explosive spraying quasicrystal coating thermal protective coating friction and wear |
| Author | Institution |
| WANG Zhong-xun |
Yantai Vocational Collage, Shandong Yantai , China |
| ZHANG Shu-ai |
Yantai Vocational Collage, Shandong Yantai , China |
| XING Qin |
Yantai Vocational Collage, Shandong Yantai , China |
| YU Ren-ping |
Yantai Vocational Collage, Shandong Yantai , China |
| GONG Xiao-feng |
Yantai Vocational Collage, Shandong Yantai , China |
| XIAO Feng-yan |
Yantai Vocational Collage, Shandong Yantai , China |
| WANG Hao |
College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin , China |
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| Abstract: |
| Quasicrystal material is a solid ordered phase with crystal structure between crystal and amorphous. It has both long-range quasi periodic translation order and amorphous rotational symmetry. Its special structure makes it outstanding in mechanics, tribology and heat insulation, and has a good application prospect in the field of medium temperature thermal protection. It has great application prospects in the surface protection of key moving parts such as aviation, ships and nuclear power. However, the content of quasicrystal phase in the quasicrystal coating has a great impact on its service performance. The retention of quasicrystal phase content is closely related to the spraying temperature. The energy of traditional plasma spraying and supersonic flame spraying is high, and the content of quasicrystal phase in the prepared coating is less than 40%. How to improve the content of high quasicrystal phase in the coating is an international problem. In this paper Al-Cu-Fe coating was prepared by explosive spraying. Firstly, Al-Cu-Fe quasicrystal coating was prepared on 2A12 aluminum alloy substrate, and then the coating was annealed. The powder morphology was observed by scanning electron microscope and the phase composition and quasicrystal content of Al-Cu-Fe quasicrystal powder were analyzed by X-ray diffraction. The mechanical properties of the coating were tested by microhardness tester and tensile testing machine. The thermal properties of the coating were measured by specific heat capacity tester and laser thermal conductivity tester. The friction and wear properties of the coating were studied by friction and wear tester. The results show that the Al-Cu-Fe quasicrystal powder prepared by water atomization mainly contains quasicrystal phase and a small amount of β-Al42.54Cu34.65Fe22.81 phase, the quasicrystal content is 73%. 882 ℃ is the melting point of quasicrystal phase, and the quasicrystal content of powder can reach 98.7% at 800 ℃. The specific heat capacity of the coating is 0.749 J/(g.K) and the thermal conductivity is 5.913 W/(m.K) at 700 ℃. The microhardness of the coating is 569.4HV0.3. After annealing, the maximum hardness can reach 658.33HV0.3. The bonding strength of the coating is 33.25 MPa, and the bonding strength after annealing is 58.75 MPa. Under different loads and temperatures, the friction coefficient of the coating is between 0.768-0.512 (both lower than the substrate). Under the loads of 15 N and 20 N, the wear rate of the coating is significantly higher than that of the substrate (the wear rate is only 7.31% of the substrate). Under the same load at high temperature, the wear rate of the coating is significantly higher than that under normal temperature (the wear rate at high temperature is 3.00% of that at low temperature). The quasicrystal coating can play a good role in thermal protection of the substrate, and also play a positive role in antifriction, wear resistance of the substrate. After annealing, the hardness, bonding strength of the coating can be effectively improved. |
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