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Plasma-Melted and Rapidly-Solidified Powders

Published online by Cambridge University Press:  15 February 2011

Richard F. Cheney
Richard F. Cheney*
Affiliation:
GTE Products Corporation, Chemical and Metallurgical Division, Hawes Street, Towanda, PA 18848
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Abstract

A novel process is described for making rapidly solidified powders. In its simplest form, powders are melted in a high-temperature plasma and the resulting high-velocity spray is quenched into a fluid medium. Rapid cooling rates are achieved by free fall in inert gases, by quenching into liquid argon or nitrogen, or by impacting against a chilled, moving substrate. Any composition can be processed as long as it or its constituents are available in powder form. When necessary, alloy or composite components are agglomerated to 15–45μm diameter prior to plasma synthesis. The agglomeration is typically achieved by spray drying. Powders with melting points up to and including tungsten have been melted.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 30: Symposium L – Plasma Processing and Synthesis of Materials I , 1983 , 163
Copyright
Copyright © Materials Research Society 1984

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