Title: Parameter Effect and Microhardness Analysis of Al_2O_3 Coatings Prepared by the Supersonic Plasma Spraying Technique
Abstract: Objective To preliminarily clarify the effect of parameters on coatings in supersonic plasma spraying and to obtain the optimal process parameters. Methods Al2O3ceramic coatings were prepared by the supersonic plasma spraying technique. The microstructure and properties of Al2O3coating 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-Al2O3and γ-Al2O3. When I = 340 A or Pair= 0. 35 MPa,the coating was almost fully deposited into the γ-Al2O3phase,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 Pairreduced,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.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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