Lanthanum key alloy wire for thermal spraying and a preparation method thereof relates to a lanthanum key alloy wire for thermal spraying applied in aspects of high temperature resistance, wear resistance and impact resistance, such as the surface spraying of automobile transmission gear, engine piston ring, synchronization ring and cylinder block.
Thermal spraying is a technology that uses some heat source (such as arc, plasma, combustion flame, etc.) to heat the filamentous metal material to a molten or semi-molten state, and then jets it to the pretreated substrate surface with compressed air at a certain speed to deposit and form a surface coating with various functions.
The lanthanum key wire used for thermal spraying is characterized by the fact that the alloy in the lanthanum key wire contains La2O3, the weight content of which is 0.1% ~ 0.8% in La, and the rest is Mo and unavoidable impurities. The invention relates to a lanthanum doped key wire for thermal spraying, which is characterized in that the diameter of the lanthanum doped key wire is L O ~ 4.2mm.
The preparation method of lanthanum doped key wire for thermal spraying is characterized by using the key dioxide and lanthanum nitrate as raw materials in the preparation process. The solution of lanthanum nitrate is added into the key dioxide in a spray way to mix evenly, and hydrogen reduction is carried out to obtain the key powder doped with rare earth oxide La2O3. Then the obtained key powder is pressed into bars, which are sintered, rolled, spun and stretched. Make lanthanum - doped key wire.
With good high temperature strength, hardness and oxidation resistance, it has more advantages than the pure key wire, and will be the replacement of the pure key wire in the aspect of thermal spraying. The preparation process does not harm the operator's body; The production process is easy to control, easy to operate, safe and reliable, no large investment and transformation in the equipment, suitable for mass production; The liquid-solid doping method is adopted, and the alloying elements added in the material are evenly distributed and the product is consistent. Using rolling, rotary forging, drawing pressure processing technology, product loss is low, high recovery.
