Plasma Processing and Processing Science (1995) / Chapter Skim
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Chapter 6--Thermal Plasmas
Chapter 6--Thermal Plasmas
Pages 19-24
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From page 19... ...
Arc-flow interactions within the plasma torch and the fluid dynamics of the plasma jet are still poorly understood. In spite of this drawback, extensive efforts are in progress to develop completely automated plasma spray systems using robotics for substrate/torch motion ant!
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From page 20... ...
Such boundary layers in chemically reacting gases attracted strong interest in spaceflight and reentry simulation and have been extensively analyzed in these connections. As the temperature across the thermal boundary layer drops from the plasma temperature to the substrate temperature, the chemically active species will be rapidly driven across the boundary layer by the extremely steep gradients there.
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From page 21... ...
In the case of nontransferred arcs, the plasma torch is essentially an arc gas heater producing 21 extremely hot gases, which emanate from the torch in the form of a plasma jet. The more common approach, however, makes use of transferred arcs where the molten pool serves as one of the electrodes and the major energy input is at the arc root of the molten bath surface.
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From page 22... ...
Sintering of high-tech ceramics in thermal plasmas has the potential of drastically reducing the time period required for this process, compared with conventional technology. In addition, plasma sintering offers the opportunity for restrained grain growth and for tailoring heat transfer during the sintering process, which may result in clesirable structures and properties of the sintered materials.
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From page 23... ...
Plasma Chemical Vapor Deposition Diamond Films Over the past several years there have been an increasing number of efforts directed toward producing diamond under thermodynamically metastable conditions, driven by the tremendous application potential because of diamoncl's unrivaled! combination of unusual properties.
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From page 24... ...
NRt Strategic Series Plasma Processing anc[Processing Science NRL suggest that the Laboratory shouts! embark on this emerging technology.
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