Laminated composite made up of an electronic substrate and a layer arrangement comprising a reaction solder

Abstract

Laminated composite () comprising at least one electronic substrate () and an arrangement of layers () made up of at least a first layer () of a first metal and/or a first metal alloy and of a second layer () of a second metal and/or a second metal alloy adjacent to this first layer (), wherein the melting temperatures of the first and second layers are different, and wherein, after a thermal treatment of the arrangement of layers (), a region with at least one intermetallic phase () is formed between the first layer and the second layer, wherein the first layer () or the second layer () is formed by a reaction solder which consists of a mixture of a basic solder with an AgX, CuX or NiX alloy, wherein the component X of the AgX, CuX or NiX alloy is selected from the group consisting of B, Mg, Al, Si, Ca, Se, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Nb, Mo, Ag, In, Sn, Sb, Ba, Hf, Ta, W, Au, Bi, La, Ce, Pr, Nd, Gd, Dy, Sm, Er, Tb, Eu, Ho, Tm, Yb and Lu and wherein the melting temperature of the AgX, CuX or NiX alloy is greater than the melting temperature of the basic solder. The invention also relates to a method for forming a laminated composite () and to a circuit arrangement containing a laminated composite () according to the invention.