利用SAS-Ⅱ型超音速电弧喷涂设备、工业级钛、铝丝材在LY12铝合金基体上制备了钛铝复合涂层,并对其显微硬度进行了测定。根据均匀设计实验方案和二次多项式逐步回归分析,获得了实验范围内,显著水平为0.002、相关系数为0.98的钛铝超音速电弧喷涂涂层显微硬度与喷涂电压、喷涂电流和喷涂距离的关系式。进一步分析表明:当喷涂电流较小时,随喷涂电压的增大,涂层的硬度逐渐下降;当喷涂电流较大时,随电压的增大,涂层的硬度随之增大,而且喷涂电流越大,其硬度的上升速度越快。而喷涂距离对涂层显微硬度的影响呈弱线性递增的关系。

Using commercial titanium and aluminum wires,Ti-Al composite coatings were prepared on the substrate of LY12 aluminum alloy by ultrasonic arc spray equipments of SAS-II,and microhardness of coatings were determined.The results of experiments were analyzed by experiments project based on uniform design theory and the quadratic polynomial stepwise regression analysis method and a regression model between microhardness of coatings and technology parameters was obtained with significance level of 0.002 and correlation coefficient of 0.98.The further analysis results showed that microhardness of coatings decreased with increased spraying voltage at lower current;microhardness of coatings increased with increased spraying voltage at higher current,moreover,the increasing rate increased with increased current;microhardness of coatings increased with increased spraying distance linearly.