| 摘要 |
PROBLEM TO BE SOLVED: To obtain a material for electrical parts requiring wear resistance and corrosion resistance by coating copper or a copper base alloy with Sn, thereafter executing heat treatment in an atmosphere in which the concn. of oxygen is controlled to the ratio equal to or below the specified one and forming an oxidized film on the outermost surface and an intermetallic compd. layer essentially consisting of Cu-Sn on the inside thereof. SOLUTION: Copper or a copper base alloy is coated with Sn, and, after that, heat treatment is executed in an atmosphere of <=5% oxygen concn. to form an oxidized film of 10 to 1000 nm thickness on the outermost surface and an intermetallic compd. layer essentially consisting of Cu-Sn on the inside thereof. The thickness of the intermetallic compd. layer essentially consisting of Cu-Sn to be formed on the inside of the oxidized film is preferably controlled to 0.1 to 10μm. Furthermore, the heat treating temp. and time for forming the intermetallic compd. layer essentially consisting of Cu-Sn are prefearbly controlled to 100 to 700 deg.C and 1 to 24 hr. The copper or copper base alloy coated with Sn obtd. by this method is excellent in surface hardness, contact resistance, bending workability, adhesion and inserting force.
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