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What is powder-based 3D printing

wallpapers News 2021-01-22
In recent years, China has actively explored 3D printing metal powder preparation technology and currently has several sets of advanced powder milling equipment in use. 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.

How is 3D printed metal powder made?
The first is the argon atomization method. 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 it into solid powder. The second is the plasma rotating electrode method. The plasma state is called the fourth state of matter. The plasma rotating electrode atomization process can be simply described as the metal or alloy is made into a consumable electrode, and the end of the consumable electrode is melted to form a liquid film under the action of a coaxial plasma arc heating source. The liquid film is thrown out at high speed under the action of rotating centrifugal force to form droplets, and the molten droplets rub against the inert gas in the atomization chamber. It is further broken under the action of shear stress, and then the droplets are rapidly cooled and solidified into spherical powder under the action of surface tension.
Metal-based powder printing
The basic principle of powder-based 3D printing is to promote the "combination" of individual powder particles by controlling the release of energy. The energy source can be laser, narrow beam of ultraviolet or electron beam. The specific method used for 3D printing, the hardware parameters, and the size of the powder particles all play a role in determining the characteristics of the final print. In metal-based powder printing, metal powders are fused together by introducing high-energy beams or agents that promote adhesion. Almost all industrially important metals can be processed by powder-based 3D printing, including stainless steel, aluminum, titanium, copper, cobalt, nickel alloys, and chromium. However, energy requirements and appropriate technology may vary from one metal to another. Therefore, it is rarely seen that metal-based 3D printers can be used with such a wide range of powder metal types.
 

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