The metal powder preparation method can be divided into: reduction method, electrolysis method, grinding method, atomization method, etc. according to the preparation process. At present, the two most advanced powder making processes commonly used in China are the argon atomization method and the plasma rotating electrode method.
Argon atomization
The argon atomization method is a pulverizing method that uses fast-flowing argon gas to impact metal liquid, break it into fine particles, and then condense into solid powder.
Plasma rotating electrode method
The plasma state is called the fourth state of matter. The plasma rotating electrode atomization (PREP method) powder making process can be simply described as: the metal or alloy is made into a consumable electrode, and the end of the consumable electrode is in the coaxial plasma arc Under the action of the heating source, the liquid film is melted to form a liquid film. The liquid film is thrown out at a high speed under the action of the rotating centrifugal force to form droplets. The molten droplets rub against the inert gas (argon or helium) in the atomization chamber, and further under the action of shear stress. Broken, and then the droplets are rapidly cooled and solidified into spherical powder under the action of surface tension.
The metal powder produced by the plasma rotating electrode method has the following advantages:
High sphericity, smooth surface, good fluidity, and high bulk density, so the powder uniformity is good, and the printed product is dense; the powder particle size is small, the particle size distribution is narrow, the oxygen content is low, and the printing time is less/no spheroidization And agglomeration phenomenon, good melting effect, high product surface finish, and the consistency and uniformity of printing can be fully guaranteed; there is basically no hollow powder and satellite powder, and there will be no air gaps and curls caused by hollow balls during the printing process. Defects such as penetration and precipitation pores and cracks.
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