| CAI Ming-wei,QU Shou-jiang,WEI Xian-shun,SHEN Jun.Effect of Spraying Technology on the Properties of AC-HVAF Sprayed Al-Cu-Fe-Si Quasicrystalline Alloy Coating[J],45(2):73-78 |
| Effect of Spraying Technology on the Properties of AC-HVAF Sprayed Al-Cu-Fe-Si Quasicrystalline Alloy Coating |
| Received:January 05, 2016 Revised:February 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.02.011 |
| KeyWord:Al-Cu-Fe-Si quasicrystalline coating AC-HVAF microhardness corrosion resistance anti-adhesive |
| Author | Institution |
| CAI Ming-wei |
School of Material Science and Engineering, Tongji University, Shanghai , China |
| QU Shou-jiang |
School of Material Science and Engineering, Tongji University, Shanghai , China |
| WEI Xian-shun |
School of Material Science and Engineering, Tongji University, Shanghai , China |
| SHEN Jun |
School of Material Science and Engineering, Tongji University, Shanghai , China |
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| Abstract: |
| Objective To prepare Al-Cu-Fe-Si quasicrystalline alloy coatings with high quality by AC-HVAF and investigate the effect of spraying parameters on the coating properties. Methods Al-Cu-Fe-Si quasicrystalline alloy coatings were prepared by AK02T AC-HVAF spraying system using gas-atomized Al-Cu-Fe-Si quasicrystalline alloy powders. The phase and microstructures of gas-atomized alloy powders and coating were analyzed by XRD and SEM. Other properties, such as corrosion resistance, microhardness and anti-adhesive, were studied by electrochemical workstation, microhardness tester and contact angle instrument. Results The study on gas-atomized Al-Cu-Fe-Si quasicrystalline alloy powders found that cooling rate had significant influence on the structure of powers and the cellular structure was founded in the finer powder particles with higher cooling rate and the quasic-rystalline content of finer powder particles was higher than that of coarser particles. The microhardness of sprayed quasicrystalline coating increased after annealing at higher temperature during heat treatment. The microhardness reached up to (724±153)HV0. 1 after annealing at 950 ℃ for 12 h. The contact angle between quasicrystalline coating and distilled water at RT reached up to 95°, which was higher than that of 45# steel (79°). The comparison of the corrosion current density for coating by the electrochemical workstation test showed the corrosion current density for coating sprayed on 5052 aluminum substrates was 2. 0×10 -7 A / cm2 and for 6. 8×10 -6 A / cm2 on 45# steel substrates in 3. 5% NaCl solution. Conclusion Gas-atomized quasicrystalline alloy powders with different sizes contain different phases. Selection of proper size of quasicrystalline alloy powders is very important for high quality coatings. Annealing process can effectively increase the coating hardness. The contact angle of Al-based quasicrystalline alloy coating is higher than that of 45# steel substrate, which indicates the improvement of anti-adhesive property of substrate. The corrosion resistance of coating varies significantly for different coating substrate materials, the coating sprayed on 5052 aluminums substrate has a better corrosion resistance than that on 45# steels substrate. |
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