Patent ID: 7219826

Claim:
A method for producing a metal/ceramic bonding substrate wherein a metal member is bonded to at least one side of a ceramic substrate via an active metal containing brazing filler metal, the method comprising the steps of: bonding a metal member to at least one side of a ceramic substrate via an active metal containing brazing filler metal; applying a resist on a predetermined portion of a surface of the metal member to etch a part of the metal member, and removing the resist from the metal member; etching a part of a metal layer, which is mainly formed of a metal other than an active metal of the active metal containing brazing filler metal, with a first chemical after the resist is removed from the metal member; and selectively etching a part of an active metal layer, which is formed of the active metal and a compound thereof, with a second chemical, which is different from the first chemical, after the part of the metal layer is etched with the first chemical, the second chemical being capable of inhibiting the metal member and the metal layer from being etched and of selectively etching the active metal layer.