Abstract：In order to strengthen the wear resistance in surface of aluminum alloy (LY12), coatings were manufactured by using titanium and aluminum wires and supersonic arc spraying systems of model SAS-I. The influence of arc spraying technological parameters on oil drip feed lubrication slide-wear resistance of coatings was studied by orthogonal regression experimental design method, then the slide wear properties of the coatings sprayed under optimum parameters conditions and the aluminum alloy matrix (LY12) was determined, the microstructure of the coatings and the character of worn surface were observed and analyzed by X-ray diffraction and scanning electric microscopy respectively. The results show that; the abrasive volume of coatings decreases with spraying voltage while the spraying distance is shorter, and increases with spraying voltage at the longer spraying distance, the longer the spraying distance, the higher the speed of coating abrasive volume increasing with spraying voltage; the abrasive volume of coatings decreases with spraying distance at lower spraying voltage, but with spraying voltage increasing, the volume of coatings increases with spraying distance and the more quickly the abrasive volume of coatings increasing with spraying distance. The abrasive volume of coatings sprayed by optimum parameters, such as 26V and 0.236m, is only equal to 1/38.84 of aluminum alloy (LY12). It is indicated that the coatings of Ti-Al twin wires ultrasonic arc spraying has excellent surface strengthening effect on aluminum alloy with optimum spraying parameters.
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