A laminated radiation member includes a radiation plate, an insulation
substrate bonded to the upper surface of the radiation plate and an
electrode provided on the upper surface of the insulation substrate. The
laminated radiation member is made by a method including the steps of
surface treating a bonding surface of the radiation plate and/or the
insulation substrate, interposing ceramic particles surface treated to
assure wettability with a hard solder or a metal between the radiation
plate and the insulation substrate, disposing a hard solder above and/or
below the ceramic particles, heating the hard solder to a temperature
higher than the melting point of the solder, penetrating the molten hard
solder into spaces between the ceramic particles to react the ceramic
particles with the solder to produce a metal base composite material, and
bonding the radiation plate and the insulation substrate with the metal
base composite material.