Preparation method for titanium alloy TiAl3-Al composite coating

The invention relates to a preparation method for a titanium alloy TiAl3-Al composite coating. The preparation method is characterized by comprising the following steps: (1) TiAl3 powder and pure Al powder are mixed in proportion, and baking is carried out after 24 hours; (2) burrs on the titanium alloy surface are polished with abrasive paper, ethyl alcohol is used for ultrasonic cleaning, sand blasting is carried out on the surface of a titanium alloy, and ultrasonic cleaning with the ethyl alcohol lasts for 5 min to 20 min; and (3) the TiAl3-Al composite coating is prepared on the surface of a titanium alloy base material with a low-temperature high velocity oxy-fuel method or a cold spraying method. By means of the preparation method for the titanium alloy TiAl3-Al composite coating, the antioxygenic property of the titanium alloy can be greatly improved through the coating; the low-temperature high velocity oxy-fuel technology or the cold spraying technology is adopted in the preparation method; and the method is easy and convenient to operate and easy to control, and the quality of the formed coating is good.