Patent ID: 9723707
Date: 2017-08-01
CPC Classifications: B23K,C04B,H01L,H05K,Y10T

Claim:
1. A power module substrate comprising: a ceramic substrate, and a circuit layer formed on a surface of the ceramic substrate, wherein the circuit layer includes an aluminum layer arranged on the surface of the ceramic substrate and, a copper layer laminated on one side of the aluminum layer by solid phase diffusion bonding, wherein a diffusion layer including Cu and Al is formed in a bonding interface between the aluminum layer and the copper layer, wherein the diffusion layer has a structure in which a plurality of intermetallic compounds is laminated along the bonding interface, wherein each of the plurality of intermetallic compounds is formed in a form of a layer, wherein the plurality of intermetallic compounds includes a θ phase, and an η2 phase, and wherein a layer of each phase is arranged in order of the θ phase and the η2 phase from the aluminum layer toward the copper layer.