Patent ID: 9579739
Date: 2017-02-28
CPC Classifications: B23K,C04B,H01L,H05K

Claim:
1. A manufacturing method of power-module substrate wherein a plurality of copper-circuit plates are bonded at intervals on a ceramic plate having an area wherein ceramic substrates can be formed abreast, and then the ceramic plate is divided between the copper-circuit plates so as to manufacture the power-module substrates, comprising: a laminating step of forming bonding-material layers of active-metal brazing material having same shapes as outer shapes of the copper-circuit plates on one of the ceramic plate or the plurality of copper-circuit plates, spreading temporal-stick material including polyethylene glycol as a major ingredient in a melted state by heating to a temperature at which polyethylene glycol is melted on the other of the ceramic plate or the plurality of copper-circuit plates, and temporary sticking the bonding-material layers and the copper-circuit plates in a state of laminating with positioning on the ceramic plate by cooling the temporal-stick material to a temperature at which polyethylene glycol becomes solid; and a bonding step of bonding the ceramic plate and the copper-circuit plates by pressurizing and heating a laminated assembly thereof in a laminating direction.