Patent ID: 7926543

Claim:
A method for producing a metal/ceramic bonding substrate, the method comprising the steps of: setting a ceramic substrate in a porous carbon mold having an inlet; injecting a molten metal of aluminum or an aluminum alloy into the mold from the inlet so as to allow the molten metal to contact the ceramic substrate; cooling the opposite side of the mold to the inlet to form a temperature gradient of 1 to 50° C./cm in the mold to cool and solidify the molten metal to bond one side of a metal plate of aluminum or the aluminum alloy to one side of the ceramic substrate, the molten metal being cooled at a mean cooling rate of 5 to 100° C./minute when the molten metal is cooled from the liquidus line temperature of the molten metal to 450° C.; and blowing a gas into the inlet or an opening, which is formed in the mold, when the molten metal is cooled and solidified, for causing the molten metal to reach end portions in the mold by allowing the gas to pass through the mold while preventing the molten metal from passing through the mold, said gas being blown so as to pressurize the molten metal from the inlet side toward the opposite side in the mold at a pressure of 1.0 to 100 kPa.