PRODUCTION OF COPPER STOCK HAVING POROUS COPPER LAYER

摘要

PROBLEM TO BE SOLVED: To provide a method capable of efficiently producing a copper stock having a porous copper layer upon a copper substrate surface of various shapes, where copper powder is bonded via copper to the substrate surface and other copper powder, and a high heat exchanging efficiency. SOLUTION: This method is provided with stages; (a) copper powder is temporarily bonded with an org. binder to the surface of a substrate consisting of copper or a copper alloy to prepare a pretreated stock; (b) the stock to be pretreated is held under heating in an oxidizing atmosphere to form an oxidized stock having a structure in which the copper powder and the substrate surface and each copper powder are cross-linking by oxide formed on each surface; and (c) the oxidized stock is held under heating in a reducing atmosphere to form a porous copper layer on the substrate surface where the copper powder is bonded to the substrate surface or to other copper powder by a metallic bond.