Patent ID: 11881439
Assignee: MITSUBISHI MATERIALS CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H  C  Y | IPC B  C  H

Claim 5:
6. A method for producing the insulating circuit substrate according to claim 3, the method comprising:
a Mg disposing step of disposing Mg between the copper sheet and the ceramic substrate;
a laminating step of laminating the copper sheet and the ceramic substrate with Mg interposed therebetween; and
a bonding step of performing a heating treatment on the laminated copper sheet and ceramic substrate with Mg interposed therebetween in a state of being pressed in a lamination direction under a vacuum atmosphere to bond the copper sheet and the ceramic substrate to each other,
wherein, in the Mg disposing step, an amount of Mg is set to be in a range of 0.34 mg/cm2 or more and 4.35 mg/cm2 or less, and
in the bonding step, a temperature increase rate in a temperature range of 480° C. or higher and lower than 650° C. is set to be 5° C./min or higher, and heating is held at a temperature of 650° C. or higher for 30 minutes or longer.