| 摘要 |
PROBLEM TO BE SOLVED: To obtain a structural body which is easily applied to a copper hollow structural body of a complicated shape and enables mass production and cost reduction by applying Au plating to a joint part of a groove and a cover formed with copper, and heating/joining them in a furnace. SOLUTION: A gold plated layer 6 of 20-40μthick is formed on the side of a pure copper cover 2 joined with a pure copper groove structural body 1, and is put on the body 1 and held in a vacuum furnace at 1,010 deg.C for 30 minutes. Thus, the gold (melting point is 1,063 deg.C) of the gold plated layer 6 and the copper (melting point is 1,083 deg.C) are alloyed by diffusion, resulting in the reduction of the melting point. They function as a Au-Cu brazing material, so that the body 1 and the cover 2 are thermal-joined by brazing in the furnace to form the copper hollow structural body. Therefore, since gold plating can be easily carried out even in the case of a difficult-to-apply complicated shape, the copper hollow structural body can be easily formed according to this method. Furthermore, mass production is possible, resulting in reduction of cost for manufacturing the copper hollow structural body.
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