Patent ID: 9237682
Filing Date: 2016-01-12
CPC Classification: B23K,C04B,H01L,H05K

Claim Text:
1. A power module substrate with a heat sink, comprising: a power module substrate having a circuit layer disposed on one surface of an insulating layer, and a heat sink bonded to an other surface of the power module substrate, wherein a bonding surface of the heat sink and a bonding surface of the power module substrate are each composed of aluminum or an aluminum alloy, a metal layer, which is composed of a rolled sheet of aluminum or an aluminum alloy, is formed on an other surface of the insulating layer in the power module substrate, and the heat sink bonded to the metal layer, a bonding layer having a Mg-containing compound (excluding MgO) which contains Mg dispersed in an Al-Si eutectic composition is formed at a bonding interface between the heat sink and the power module substrate, a thickness of the bonding layer is within a range from not less than 5 μm to not more than 80 μm, and a MgO content in the bonding layer is not more than 20% by area.