| MAO Jie,SONG Jin-bing,DENG Chang-guang,HUANG Ke.Parameter Effect and Microhardness Analysis of Al2 O3 Coatings Prepared by the Supersonic Plasma Spraying Technique[J],43(4):110-114,141 |
| Parameter Effect and Microhardness Analysis of Al2 O3 Coatings Prepared by the Supersonic Plasma Spraying Technique |
| Received:March 24, 2014 Revised:May 09, 2014 |
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| DOI： |
| KeyWord:supersonic atmosphere plasma spraying Al2 O3 coating spraying parameters microstructure process optimization microhardness |
| Author | Institution |
| MAO Jie |
Guangzhou Research Institute of Non-ferrous Metals, Guangzhou , China |
| SONG Jin-bing |
Guangzhou Research Institute of Non-ferrous Metals, Guangzhou , China |
| DENG Chang-guang |
Guangzhou Research Institute of Non-ferrous Metals, Guangzhou , China |
| HUANG Ke |
Guangzhou Research Institute of Non-ferrous Metals, Guangzhou , China |
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| Abstract: |
| Objective To preliminarily clarify the effect of parameters on coatings in supersonic plasma spraying and to obtain the optimal process parameters. Methods Al2 O3 ceramic coatings were prepared by the supersonic plasma spraying technique. The microstructure and properties of Al2 O3 coating were characterized and the effect of spraying parameters such as spraying current, pressure of plasma gas and spray distance were also discussed. According to the response surface methodology, the optimization experiment with three factors and three levels was designed and the regression equation was established between the influencing factors and the response value, thickness. Results When I = 260 A or Pair = 0. 55 MPa, the coating was a dual-phase composite structure consisting of α-Al2 O3 and γ-Al2 O3 . When I = 340 A or Pair = 0. 35 MPa, the coating was almost fully deposited into the γ-Al2 O3 phase, substantially containing no unmelted particles. Change in spraying distance had no significant effect on the phase composition of the coating. When I or d increased or Pair reduced, HV tended to increase. Conclusion In the experimental range, the optimal process parameters for microhardness of supersonic plasma spray were Pair = 0. 35 MPa, I = 340 A and d = 230 mm. |
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