中文摘要：

为获得低孔隙率的Al2 O3-40％TiO2（ AT40）涂层，采用响应曲面法（ RSM）优化超音速等离子喷涂AT40涂层的工艺参数，利用Box-Behnken（ BBD）设计分析送粉量、喷涂功率、氩气流量、氢气流量4个主要因素对涂层截面孔隙率的影响规律，利用Design Expert软件设计试验方案，统计分析试验数据，并得到二次多元回归模型．研究表明，在本试验条件下，4种因素对孔隙率影响顺序依次为氩气流量＞氢气流量＞喷涂功率＞送粉量，最优工艺参数为送粉量30 g/min，喷涂功率51．4 kW，氩气流量3．0 m3/h，氢气流量0．45 m3/h，试验测得此时涂层孔隙率为2．74％。

英文摘要：

To reduce Al2O3-40%TiO2（AT40）coating porosity, an optimization experiment was designed to get the optimal performance of supersonic sprayed AT40 coating. Response surface methodology （ RSM） based on Box-Behnken design （ BBD） has been used in this experimental design. Input factors were designed with four representative spraying parameters：powder feed rate, spraying power, argon flow rate and hydrogen flow rate. Porosity of AT40 coating, as the only measured response, was applied to estimate the influence of spraying process on the coating performance. Results indicate that the porosity is the most sensitive to change argon flow rate, followed by hydrogen flow rate, spraying power and powder feed rate. Optimum Spraying parameters were powder feed rate 30 g/min, spraying power 51.4 kW, argon flow rate 3.0 m3/h and hydrogen flow rate 0.45 m3/h, under which the average porosity was 2.72%.