COPPER/CERAMIC BONDED BODY, INSULATING CIRCUIT SUBSTRATE, COPPER/CERAMIC BONDED BODY PRODUCTION METHOD, AND INSULATING CIRCUIT SUBSTRATE PRODUCTION METHOD

摘要

A copper/ceramic bonded body includes: a copper member made of copper or a copper alloy; and a ceramic member made of an aluminum oxide, wherein the copper member and the ceramic member are bonded to each other, a magnesium oxide layer is provided on a ceramic member side of an interface between the copper member and the ceramic member; and a Mg solid solution layer is provided between the magnesium oxide layer and the copper member and contains Mg in a state of a solid solution in a Cu primary phase.