Patent ID: 8592986
Filing Date: 2013-11-26
Classification: B23K,B32B,H01L,Y10T

Abstract:
1. A high melting point soldering layer comprising: a low melting point metal layer; a first high melting point metal layer disposed on a surface of the low melting point metal layer; and a second high melting point metal layer disposed at a back side of the low melting point metal layer, wherein the low melting point metal layer, the first high melting point metal layer, and the second high melting point metal layer are subjected to pre-treatment, and subsequently the low melting point metal layer, the first high melting point metal layer, and the second high melting point metal layer are mutually alloyed by liquid phase diffusion bonding, wherein the low melting point metal layer is formed of one of an Sn layer and an Sn—Ag eutectic solder layer, the first high melting point metal layer is formed of an Ag layer, and the second high melting point metal layer is formed of one of an Ag layer and an Ni layer.