Heat treatment by plasma electron heating and solid/gas jet...

Details Heat treatment by plasma electron heating and solid/gas jet... Heat treatment by plasma electron heating and solid/gas jet...

C - Chemistry, Metallurgy

21

D

C21D 1/613 (2006.01) C21D 1/09 (2006.01) C21D 1/38 (2006.01) C21D 9/32 (2006.01) C23C 8/36 (2006.01) C21D 1/28 (2006.01) C21D 1/773 (2006.01)

Patent

CA 2206714

A workpiece (44) is heated by first forming an ionized gas plasma (38) around the workpiece (44). A positive potential is applied to the workpiece (44) to accelerate electrons from the plasma (38) into the workpiece (44). The workpiece (44) is uniformly surface heated by the energy directed into the workpiece (44) by the electrons. The workpiece (44) is cooled by providing a flow of a pressurized liquid material such as carbon dioxide having a triple point. The liquid material is expanded through a nozzle (62) to form solid particles (70) that contact the surface of the workpiece (44) and remove heat from it by sublimation.

Une pièce (44) est chauffée, avec au départ formation d'un plasma de gaz ionisé (38) autour de la pièce (44). Un potentiel positif est appliqué à la pièce (44) pour accélérer les électrons provenant du plasma (38) dans la pièce (44). La pièce (44) est chauffée uniformément en surface par l'énergie qui lui est communiquée par les électrons. La pièce (44) est refroidie par un flux de matière liquide sous pression, comme du dioxyde de carbone à triple point. Puis il y a expansion de la matière liquide à travers un éjecteur (62) avec formation de particules solides (70), qui arrivent en contact avec la surface de la pièce (44) et en retirent la chaleur par sublimation.

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