Patent ID: 6207221
Filing Date: 2001-03-27
Classification: H01L,H05K

Abstract:
A process for producing a ceramic-metal substrate for electrical circuits, said substrate having a ceramic layer and first and second metal coatings, each applied on one side to the ceramic layer and at least one through metal bonding provided in the area of at least one opening in the ceramic layer and connecting the first and second metal coatings, said process comprising:applying a copper foil by using the DCB-process to one side of the ceramic layer as the first metal coating, andafter that, forming the second metal coating by applying a conductor paste which contains at least the metal of the second metal coating, an organic binder and a glass component on to the other surface side of the ceramic layer and also into the at least one opening and on to a surface of the first metal coating which is exposed in said at least one opening or around said at least one opening, by drying and firing the applied conductor paste, the paste forming a glass layer between said ceramic layer and said second metal coating and no glass layer being formed between said second metal coating and said first metal coating.