Patent ID: 11939270
Assignee: MITSUBISHI MATERIALS CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  C  H | IPC B  C  H

Claim 5:
6. A copper/ceramic bonded body comprising a copper member and a ceramic member bonded to each other, wherein
the copper member has a composition having a Cu purity of 99.96 mass % or more, a balance of inevitable impurities, a P content of 2 mass ppm or less, and a total content of Pb, Se and Te of 10 mass ppm or less,
in a cross section of the copper member, a maximum area ratio is set to 45% or less when a crystal orientation map of copper obtained by EBSD is trisected into (001) planes, (111) planes, and (101) planes, and
a grain boundary length in a field of view of 1 mm2 in the cross section of the copper member is set to 10 mm or more and less than 30 mm.