| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a heat exchanger having high temperature oxidation resistance and erosion resistance by using a relatively inexpensive ferrite and austenitic stainless steel plates. SOLUTION: The parts of the heat exchanger are formed by bending the ferrite or austenitic stainless steel plates. Next, the surfaces of the parts are coated with a phosphorus-containing nickel alloy film 3 by electroless deposition. Next, these parts are assembled and put in a vacuum furnace, and the phosphorus-containing nickel alloy is diffused from the surface to the inside of the parts to form a nickel-enriched layer 4 on the surfaces thereof. Also, the coated phosphorus-containing nickel alloy film 3 is fused, and the heat exchanger assembly is cooled to fixedly braze the parts to each other with the phosphorus-containing nickel alloy as a brazing material. COPYRIGHT: (C)2004,JPO&NCIPI |
