Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1976-06-03
1977-09-13
Stallard, W.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
264 12, B22D 2308
Patent
active
040479331
ABSTRACT:
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.
REFERENCES:
patent: 3907552 (1975-09-01), Kennedy
Gummeson, P.U., "Modern Atomizing Techniques," Powder Metallurgy, vol. 15, No. 29, 1972, pp. 67-94.
Clark Ian Sidney Rex
Gibson Robert Cameron
Larson Jay Michael
Kenny Raymond J.
MacQueen Ewan C.
Petersen Walter A.
Stallard W.
The International Nickel Company Inc.
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