Patent ID: 9414512
Filing Date: 2016-08-09
CPC Classification: C04B,H01L,H05K,Y10T

Claim Text:
1. A power module substrate comprising: a ceramic substrate composed of AlN or Si a metal plate which contains aluminum or an aluminum alloy, and which is stacked and bonded on a surface of the ceramic substrate; wherein one or more additional elements selected from Ag, Zn, Ge, Mg, Ca, Ga, and Li are solid-solubilized in said metal plate, an Ag concentration in said metal plate in the vicinity of the interface with said ceramic substrate is greater than or equal to 0.05% by mass and less than or equal to 10% by mass, or the total concentration of Zn, Ge, Mg, Ca, Ga, and Li in said metal plate in the vicinity of the interface with said ceramic substrate is greater than or equal to 0.01% by mass and less than or equal to 5% by mass, an oxygen high concentration part having an oxygen concentration two or more times the oxygen concentration in the crystal grain of said ceramic substrate is formed in the bonding interface between said metal plate and said ceramic substrate, and the thickness of said oxygen high concentration part is less than or equal to 4 nm.