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.
Published Version
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