| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a metallic plate for heat dissipation which can reduce warpage when joined to a package main body. SOLUTION: A plate member made of copper-molybdenum-based composite metallic material is rolled in a first direction perpendicular to its thickness direction (S2), and is rolled in the thickness direction and in a second direction perpendicular to the first direction (S3). A ratio in thickness between the plate member rolled in the second direction and the plate member before rolled is not smaller than 20% and not larger than 40%. Thus the interior anisotropy of the plate member after rolled is removed so that the member has a suitable thermal expansion coefficient and the warpage of a resulting metallic plate for heat dissipation is reduced. Further, since the plate member processed (S4) into a predetermined shape by punching ins subjected to heat treatment (S5), the interior distortion of the plate member after processed can be removed. Accordingly the warpage of the metallic member when joined to a package main body can be reduced and an electronic component can be firmly fixed on the metallic member. |
