電解銅箔の機械的性質

抄録

Copper was electrodeposited from additive-free acid sulfate baths on nickel (passivated in chromate solution for each run) or SUS304 substrate, the surfaces of which were engraved with 41 parallel lines at 0.25mm intervals. Tension tests were made on the copper foil obtained, and measurements were made of total elongation (gauge length=10mm) E, elongation for gauge length of 2.5mm including point of rupture) E₃, and the maximum elongation at the rupture point E₁. Observations with SEM and X-ray diffraction were also made. Constant linear relationships were found between E₁, E₂ and E₃ regardless of bath composition, current density and foil thickness, though these relationships depended on the shape of the tensile specimen. For electrolytic copper foil 25-35μm thick, tensile strength and E₃ were 30-40kg/mm² and 15-25% respectively. For thicker foils, tensile strength was lower and elongation values were higher.