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Metal Injection Molding Stainless Steel Powder Production

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Metal injection molding technology developed from the ceramic injection molding technology, it's a new type of powder metallurgy forming technology. The main production steps of the metal injection molding technology are: Metal powder mixed with binder - granulation - injection molding - degreasing - sintering - follow-up treatment - final product The technology is suitable for high-volume production performance, The shape of the complex size of the powder metallurgy parts.

In recent decades, the rapid development of MIM technology, can be applied to the material system include: Fe-Ni alloy, stainless steel, tool steel, high specific gravity alloy, cemented carbide, titanium alloy, nickel-based superalloy, intermetallics, , Zirconium oxide, etc. Metal injection molding technology requires powder size below the micron level, the shape of nearly spherical. In addition to the powder loose density, tap density, powder aspect ratio, natural slope angle, particle size distribution also has certain requirements. At present, the main methods of producing metal injection molding powder are water atomization method, gas atomization method and carbonyl method. Commonly used stainless steel metal injection powder grades are: 304L, 316L, 317L, 410L, 430L, 434L, 440A, 440C, 17-4PH.

Water atomization method process:
Stainless steel raw materials - medium frequency induction furnace melting - Ingredient adjustment - Deoxidation and deslagging - Atomization and milling - Quality inspection - Screening - Packaging

The main equipment used are: medium frequency induction furnace, high pressure Water pump, fully enclosed powder plant, circulating water pool, screening and packaging equipment, testing equipment.

Gas atomization method process:
Stainless steel raw materials - medium frequency induction furnace melting - Ingredient adjustment - Deoxidation and deslagging - Atomization and milling - Quality inspection - Screening - Packaging

The main equipment used are: IF induction furnace, nitrogen Source and atomization devices, circulating water tanks, screening and packaging equipment, testing equipment and so on.

Each method has its pros and cons: water atomization is the main milling process, it's very efficient, with large-scale production and more economical, can make the powder subtle, but the shape is irregular, which is conducive to conformal, but the use of sticky More agents, affecting the accuracy. In addition, water and metal formed by the reaction of high temperature oxide film hinder sintering. Gas atomization is the production of metal injection molding technology with the main method of powder, it is the production of spherical powder, low degree of oxidation, the required less binder, good formability, but the fine powder yield is low, high prices And C, N, H, O in the binder have an effect on the sintered body. Carbonyl powder produced by the high purity, stable, very fine particle size, it is most suitable for MIM, but only limited to Fe, Ni and other powder, can not meet the requirements of the species. In order to meet the requirements of metal injection molding technology powder, many milling companies have improved the above method, but also the development of micro-atomization, laminar flow atomization and other milling methods. It is now usually mixed with water atomizing powder and aerosolized powder, the former to improve the tap density to maintain conformability. At present, the use of water spray powder can also produce relative density greater than 99% of the sintered body, so the larger parts only use water spray powder, smaller parts using aerosol powder.


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