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根据Box-Behnken二阶响应曲面法,设计了三因素三水平的回归分析试验;采用大气等离子喷涂技术在TC4钛合金表面制备了Cr2O3涂层,以不同工艺条件下的涂层显微硬度(H)作为响应值,建立了喷涂电流I、等离子气体流量QAr和喷距d与硬度响应输出之间的数学模型,讨论三种影响因子的显著性及其交互作用的影响,得到了涂层硬度的连续变量响应曲面和等高曲线,用于大气等离子喷涂Cr2O3涂层的工艺优化和性能预测。结果表明:涂层硬度的优化二次拟合曲线方程为H=17 330.35+10.15I-735.74QAr-47.57d+0.073I·d-0.014I2+7.8QAr2;最大硬度的预测参数为I=588.47 A,QAr=40.00 L·min-1,d=80.00 mm,此时能获得的硬度高达1 271.72 HV0.3,与实际测得的最大硬度1 284.7 HV0.3相当。
According to the Box-Behnken second-order response surface method, a three-factor and three-level regression analysis test was designed. Cr2O3 coating was prepared on the surface of TC4 titanium alloy by atmospheric plasma spray technique. The microhardness ) As the response value, the mathematical model of the spray current I, the plasma gas flow rate QAr and the jet pitch d and the hardness response output was established. The significance of the three influencing factors and their interaction effects were discussed. The hardness of the coating Continuous Variable Response Surface and Contour Curves for Process Optimization and Performance Prediction of Atmospheric Plasma Sprayed Cr2O3 Coatings. The results show that the optimal quadratic fitting curve equation of the coating hardness is H = 17 330.35 + 10.15 I-735.74 QAr-47.57d + 0.073I · d-0.014I2 + 7.8QAr 2; the prediction parameter of the maximum hardness is I = 588.47 A , QAr = 40.00 L · min-1 and d = 80.00 mm. The hardness at this time is as high as 1271.72 HV0.3, which is equivalent to the actual measured maximum hardness of 1 284.7 HV0.3.