Cu SHEET TREATMENT METHOD AND Cu SHEET

摘要

PROBLEM TO BE SOLVED: To reduce a stress relaxation rate while making the best use of material characteristics of a Cu sheet.SOLUTION: There is provided a Cu sheet treatment method including an embedding process in which a particulate functional material is supplied onto a surface of a sheet substrate made of Cu or Cu-based alloy, the surface of the sheet substrate is melted by applying laser beams toward the surface of the sheet substrate supplied with the particulate functional material to thereby form a melted part, and then melted part is solidified while the particulate functional material is settled in the melted part, and thus the particulate functional material is directly buried into a prescribed portion of the sheet substrate. The Cu sheet 10 subjected to the treatment includes: the sheet substrate 12 composed of a base material made of Cu or Cu-based alloy; a solidified part 16 which is formed on the prescribed portion of the surface of the sheet substrate 12 and is structure in which the base material is melted and solidified; and an embedding part 18 provided with the particulate functional material 20 directly buried into the solidified part 16.