Preparation method of titanium alloy powders

A preparation method of titanium alloy powders, wherein, comprising following steps of:

• mixing alloying elements according to alloy element ratios of:
• 0.1 wt % to 1.0 wt % Y, 5.5 wt % to 6.8 wt % Al, 3.5 wt % to 4.5 wt % V, and Ti as balance, preparing alloy ingots by a vacuum melting process, and performing a forging and rolling process for the alloy ingots to obtain forged and rolled alloy ingots, where, a temperature of the forging and rolling process is 800° C. to 1100° C., an insulation time of the forging and rolling process is 80 min to 140 min, and a deformation degree of the alloy ingots during the forging and rolling process is 30% to 50%;
• performing a mechanical treatment for the forged and rolled alloy ingots, to obtain alloy rods that meet a size requirement of a plasma rotating electrode process;
• preparing titanium alloy powders based on the alloy rods by the plasma rotating electrode process;
• where, the step of preparing titanium alloy powders based on the alloy rods by the plasma rotating electrode process comprises:
• loading the alloy rods into a rotatable feeding device, vacuuming an atomization chamber until a vacuum degree of the atomization chamber reaches 1×10−3 Pa to 1×10−2 Pa, and filling inert gas into the atomization chamber until a pressure of the atomization chamber reaches 1.6×105 Pa to 1.8×105 Pa, and monitoring an oxygen content of the atomization chamber to keep the oxygen content of the atomization chamber not greater than 100 ppm;
• starting a cooling system to control a temperature of the inert gas within 200° C. to 400° C.;
• starting the rotatable feeding device and a power supply of a plasma gun, to perform an atomizing process, and to obtain the titanium alloy powders, where a plasma arc is generated between the alloy rods and the plasma gun, and under a combining action of a centrifugal force and a surface tension, the alloy rods are melted and changed into droplets, and the droplets are solidified into the titanium alloy powders, after the titanium alloy powders completely cooled down, the titanium alloy powders are vacuum packaged and stored;
• preparing parameters are:
• a rotating speed of the alloy rods is 25000 r/min to 35000 r/min, a feeding speed of the alloy rods is 1.0 mm/s to 2.0 mm/s, a power of the plasma gun is 60 kw to 140 kw, adopting inert gas as a protective gas during a powder making process, a spindle current of the plasma rotating electrode of the rotating feed device is 600 A to 800 A, and a working current of the plasma gun is 80 A to 120 A.