| 摘要 |
PURPOSE:To enable to perform the safe, sanitary and economic heat-treatment of a metal over a broad temperature range, by supplying atmospheric gas during raising or lowering a temperature to preset values for the heat-treatment to fluidize the heat resistant powdery body on a fluidized bed, and unfluidizing the powdery body during holding the temperature at said preset value. CONSTITUTION:By opening a valve 10, atmospheric gas heated at a predetermined temperature by a preheater 11 is supplied to a pressure chamber 2 and let flow through a gas-diffusing plate 3 into furnace bed to fluidize heat resistant powdery body 4. Thereafter, the air cylinder 13 of a means 12 for opening or closing an oven covr is driven to detach the oven cover 7, a metal 19 to be treated, directly or as received in a bascket or the like, is submerged in the fluidized bed, and the cover 7 is reattached to a retort 6. When the temperature of the metal 19 detected by a temperature controller 16 and the furnace temperature detected by a temperature-indicating and controlling means 17 come in a preset range for heat-treatment during heat-treatment, applying an electric current to a heater 5 is stopped through a controller 18, and the atmospheric gas is intercepted or reduced by controlling the valve 10. Consequently, the powdery body is unfluidized. |
