Patent ID: 9101063
Filing Date: 2015-08-04
Classification: C04B,H01L,H05K,Y10T

Abstract:
1. A power module substrate comprising: a ceramics substrate composed of Si a metal plate composed of aluminum having a purity of 99.99% or more and joined to the top face of the ceramics substrate with a brazing filler metal including a melting-point lowering element interposed therebetween; and a high concentration section formed at a joint interface at which the metal plate is joined to the ceramics substrate, having an oxygen concentration that is greater than an oxygen concentration in the metal plate and in the ceramics substrate, and having a thickness of less than or equal to 4 nm, wherein a mass ratio of Al, Si, O, and N is Al:Si:O:N=15 to 50 wt %:25 to 50 wt %:20 wt % or less:10 to 40 wt % when the joint interface is analyzed by an energy dispersive X-ray spectroscopy.