Porosity reduction in inert-gas atomized powders

C - Chemistry – Metallurgy – 22 – C

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75/1, 18/500.3

C22C 1/00 (2006.01) B22F 9/08 (2006.01)

Patent

CA 1082004

Abstract of the Disclosure Thermally induced porosity, which can lead to cracking in metal powders after consolidation, is believed to be caused by the entrapment of the inert gas used for atomization within the metal powders. The addition of an activating agent to the molten alloy prior to atomization with an inert gas, such as argon, serves to substantially reduce the porosity of metal powders. Suitable activating agents are characterized by an ability to rapidly diffuse to the surface of a molten metal particle and an affinity for oxygen. Activating agents that are useful for high nickel alloys and highly alloyed steels include magnesium, calcium, lithium, silicon, and rare earths.

274486

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