• Source: Metal powder

Metal powder is a metal that has been broken down into a powder form. Metals that can be found in powder form include aluminium powder, nickel powder, iron powder and many more. There are four different ways metals can be broken down into this powder form:

Direct reduction
Gas atomization
Liquid atomization
Centrifugal atomization




Processes


The following processes can be used to produce metal powder:

Direct reduction is the result of blending carbon with iron oxide ore, heating the mixture, removing the sponge iron from the carbon, grinding it, annealing it, and regrinding to make the powder form usable for manufacturing.
Gas atomization occurs when a molten metal is passed through a passageway to a gas-filled chamber that cools the metal. As it falls, it is collected and annealed into a powder.
Liquid atomization is similar to gas atomization, but instead the metal is sprayed with high-pressure liquid which solidifies the droplets more rapidly. This results in the powder being more porous, smaller, and cleaner.
Centrifugal atomization occurs when a metal is put into a chamber as a rod and electrically melted, at the end of the rod, to produce melted droplets that fall into another chamber and then solidify.




Types and Uses


Back in the early 1900's, metal powder was the currency used in the United States of America. Depending on the market, metal powder can be more valuable than gold. The following are the types and uses of metal powder:

Aluminum powder: Fireworks, metallic paints, manufacturing in solar cells in the green energy sector
Bismuth powder: Production of batteries, welding rods, creating alloys
Cadmium powder: Glazed used on ceramics, transparent conductors, nickel-cadmium batteries
Iron powder: Magnetic products, printing, brake pads, certain types of dyes and stains
Nickel powder: used for corrosion resistance, such as in the marine industry
Raney nickel: used as a catalyst
Platinum black: used as a catalyst
Titanium powder: used in aerospace applications, medical implants and sporting goods.




See also


Metal swarf
Powder metallurgy
Pressing
Sintering




References

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