Patent ID: 11908768
Assignee: MITSUBISHI MATERIALS CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A bonded body for an insulation circuit substrate board, comprising
a ceramic substrate board,
a plurality of aluminum circuit layers bonded on one surface of the ceramic substrate board, copper circuit layers bonded on the respective aluminum circuit layers by solid phase diffusion, and
intermetallic compound layers between the aluminum circuit layers and the copper circuit layers, wherein
in the intermetallic compound layers, a boundary is set at a position of 50 μm from an edge part beside a gap between the adjacent copper circuit layers, a thickness ratio t2/t1 is 30% or more where an average thickness in a center side of the boundary is t1 and an average thickness in an edge part side of the boundary is t2.