Patent ID: 7532481
Filing Date: 2009-05-12
Classification: C04B,H01L,H05K,Y10S,Y10T

Abstract:
1. A base plate for a power module comprising: a metal plate; a ceramic base plate that is joined to the metal plate and contains X as an element selected from the group consisting of aluminum and silicon; and a release agent which includes boron provided in a joint surface between the metal plate and the ceramic base plate, wherein a remaining amount of the release agent is less than 5 as an amount of boron measured by fluorescence X-ray analysis, a ceramic crystal grain straining region in the joint surface of the ceramic base plate is equal to or less than 40%, and the amount of boron is defined as a value obtained by an expression: (a peak height of B-Kα/ a peak height of X-Kα)×100000.