Patent ID: 8377240

Claim:
A method for manufacturing double-sided metallized metal-ceramic substrates in the form of DCB packets, the method comprising the steps of: forming at least one DCB packet, the at least one DCB packet comprising a first metal layer and a second metal layer and a ceramic layer located between the first and the second metal layers and the at least one DCB packet is formed by a bonding method wherein the first and the second metal layer are oxidized on both surface sides, placed on the ceramic layer in a nitrogen atmosphere with an oxygen content of 10×10 −6 percent by volume and heated to a bonding temperature of between 1025° C. and 1083° C., so that a surface of the first and second metal layer forms a liquid eutectic with a temperature lower than a melting point of the first and second metal layer, the eutectic facilitates bonding the first metal layer and second metal layer on each side of the ceramic layer, and a separating layer is placed on at least one base plate, the separating layer consisting of a heat resistant material, wherein one of the first and second metal layers of the at least one DCB packet bears against the separating layer, the separating layer is a porous layer made of a separating layer material selected from the group mullite, Al 2 O 3 , TiO3, ZrO 2 , MgO, CaO, CaCO 2 or of a combination of at least two of these separating materials, wherein the separating layer has a porosity ratio of pore volume to solid volume greater than 20%, and bonding the first metal layer to the second metal layer with the ceramic layer by heating to a direct bonding temperature to form the at least one DCB packet while the first metal layer, the second metal layer and the ceramic layer are supported on the separating layer which is on the at least one base plate, wherein the base plate is made of a component selected from mullite, ZrO 2 , Al 2 O 3 , AlN, Si 3 N 4 , SiC or a combination thereof.