| 摘要 |
PURPOSE:To permit brazing with powder solder such as Ni solder with the same ease as with a brazing sheet by forming a brazing filler metal for a heat exchanger to be integrally joined on the surface of a base metal by thermal spraying in a nonoxidative atmosphere. CONSTITUTION:The plate fin type heat exchanger is constituted by interposing separating plates 2 between respective corrugated fins 1..., pressing the spacer bars 3, 3... to the right and left side face parts of the fins 1..., and inserting the same between the upper and lower plates 2.... The respective parts of the heat exchanger are all formed of a stainless steel. The thermally sprayed films of the Ni brazing filler metals 4, 4 are preliminarily formed on both faces of the plates 2... as the base metal for thermal spraying. After such fins 1... and the spacers 3, 3... are combined, the entire part of the heat exchanger is heated in a vacuum furnace to integrally braze the heat exchanger. A plasma spraying device is used for the above-mentioned thermal spraying and the thermal spraying of the spraying material is executed in the nonoxidative atmosphere.
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