| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluidized bed type heat treatment furnace being more compact and capable of performing higher quality heat treatment when compared with a conventional fluidized bed furnace. SOLUTION: This fluidized bed type heat treatment furnace 3 is constituted in such a way that the inside of a furnace body 39 is filled with a powder and granular material, which is heated by heated air blown into the inside of the furnace body 39 through a heated air pipe 14 and flows to form a fluidized bed 13, and a metal-made workpiece 11 is heat-treated in the fluidized bed 13. In this fluidized bed type heat treatment furnace 3, flow velocity of heated air for letting the powder and granular material flow is 0.05 to 0.2 m/sec, the powder and granular material has apparent specific gravity of 1.6 to 1.8, and substantially spherical bodies having diameter of 400 to 600μmϕoccupy 60% or more. COPYRIGHT: (C)2005,JPO&NCIPI
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