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Abstract

Arc-plasma is introduced by a comparison with conventional heat sources. The mechanism and requirements of arc-plasma devices and equipment are then considered. An arc-plasma materials-deposition unit for automatic operation in an atmosphere of controlled composition and pressure is described. Photographs of objects plasma-spray-formed in tungsten are shown, together with microstructures of plasma-sprayed refractory deposits.

Metallurgical applications of arc-plasma technology are considered under four headings:

Plasma as a user: the requirements of powders for arc-plasma purposes are discussed.

Plasma as a producer: extractive metallurgy, production of ultrafine–and spherical–particles, powders of intermetallic compounds and alloys.

Plasma as a fabricator: consideration of spraying, spray-welding, spray-forming, cutting, and arc-plasma furnaces, including King's rotating-plasma furnace.

Plasma as a tester: pla,sma for the analyst, application to thermal endurance, ablation, and thermal-shock testing.

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THE ROLE OF ARC-PLASMA IN METALLURGY *

Abstract

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