SUBSTRATE FOR POWER MODULE, POWER MODULE, AND METHOD FOR PRODUCING SUBSTRATE FOR POWER MODULE

摘要

A power module substrate includes: a ceramics substrate (11) composed of AlN. having a top face; a metal plate (22, 23) composed of pure aluminum and joined to the top face of the ceramics substrate (11) with a brazing filler metal (24, 25) including silicon interposed therebetween; and a high concentration section (32) formed at a joint interface (30) at which the metal plate (22, 23) is joined to the ceramics substrate (11), having a silicon concentration that is more than five times the silicon concentration in the metal plate (22, 23).