目的：初步明确超音速等离子喷涂参数对涂层的影响规律，优化工艺参数。方法采用超音速等离子喷涂技术制备 Al2 O3陶瓷涂层，对涂层进行表征，分析喷涂电流 I、等离子发生气体压力 Pair、喷距 d对涂层显微结构的影响。基于涂层显微硬度 HV 设计工艺优化试验，建立喷涂参数与显微硬度之间的回归方程。结果 I=260 A 或 Pair =0.55 MPa 时，涂层是α-Al2 O3和γ-Al2 O3双相复合结构；I =340 A 或 Pair =0.35 MPa 时，涂层几乎全由γ-Al2 O3相组成，基本不含有未熔颗粒；喷距变化对涂层相组成的影响不显著。 I 或 d 增大，或者 P
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 ex-periment 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 composi-tion of the coating. When I or d increased or Pair reduced, HV tended to increase. Conclusion In the experimental range, the opti-mal process parameters for microhardness of supersonic plasma spray were Pair =0. 35 MPa, I=340 A and d=230 mm.
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