How is metal powder made for 3D printing?

Most metal powders used in 3D printing, such as iron, nickel, cobalt, aluminum, and titanium alloys, are produced by gas atomization. In this process, a feedstock is melted in a crucible before it is ejected from a nozzle into a high-pressure gas stream.

What is gas atomization?

Gas atomization is a process that takes a melted sample of a metal alloy and creates a melt stream. The melt stream is then impinged with a powerful atomization gas that causes dispersion and creates particles. The particles or droplets then fall and cool as they make contact with a substrate or metal plate.

How is PM steel made?

Powder metallurgy uses “gas atomization” where a stream of liquid steel is passed through nitrogen sprays that instantly solidify the steel into a fine powder. That powder is then pressed into a canister at high pressure and temperature to create a solid ingot that can then be processed normally.

What are the steps involved in preparation of powder?

To prepare powders consisting of particles having a particular size and shape, careful selection of the preparation technique is necessary. Grinding, the thermal decomposition of solids and the deposition of solids from the liquid or vapour phase are the commonest techniques used for the preparation of powders.


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