Patent ID: 6156993
Filing Date: 2000-12-05
Classification: C21D,F27B,F27D,Y02P

Abstract:
A heat treated substance, wherein said substance is subjected to a thermal plasma heat treatment conducted by means of a plasma flame being produced by a thermal plasma heat treatment apparatus comprising:a thermal plasma torch for producing a thermal plasma at the downstream side of said thermal plasma torch;a plasma flame furnace for controlling the heat of said thermal plasma thus produced by said plasma torch, said plasma flame furnace being disposed downstream from said thermal plasma torch;a reactor column in which said workpiece is subjected to a thermochemical reaction, said reactor column being disposed downstream from said plasma flame furnace; anda supply means for supplying said workpiece into said reactor column, said supply means being disposed downstream from said plasma flame furnace,wherein said plasma flame furnace comprises:a portion through which a plasma flame produced by said plasma torch passes, defined as a plasma passage; anda diffuser means for diffusing a stream of said plasma flame, wherein said plasma passage and said diffuser means comprise:an inlet tube into which said plasma flame flows;an outlet tube from which said plasma flame flows; anda diffusion chamber disposed between said inlet tube and said outlet tube, said diffusion chamber being enlarged in diameter with respect to said outlet tube, said diffusion chamber further comprising a barrier member, which changes the flow direction of said plasma flame,wherein said barrier member is disposed in said diffusion chamber of said plasma passage.