| 摘要 |
PURPOSE:To reduce initial cost by introducing an inert gas into a furnace, decreasing the external pressure and performing brazing thereby providing the strength of the furnace to the extent that the furnace withstands the condition during cleaning of an assembling material. CONSTITUTION:A bell-jar 3 is risen from a base plate 1 and after an assembling material 13 is fixed on a stage 8, the bell-jar 3 is descended to close the bottom open end thereof. A gas feed valve 13 is then closed and a gas discharge valve 11 is opened to evacuate the gas from the inside of the bell-jar then an inert gas is introduced therein through the valve 12. Electricity is conducted to a primary coil 4 to heat the material 13 by the radiation heat of the bell-jar 3 generated by the conduction of electricity. When ion bombardment is performed by impressing a high voltage between the material 13 and the bell-jar 3 in this state, the oil- component and oxidized film of the material 13 are removed and are captured in a trap 10. The conduction of the high voltage is then stopped and the inert gas is further introduced through the valve 12. The voltage to the coil 4 is increased to heat the bell-jar 3 until the material 13 attains a prescribed temp. by which the respective members are brazed to each other. |
