Electronic part mounting substrate and method for producing same

1. An electronic part mounting substrate comprising:

a ceramic substrate;

a metal member bonded to one side of said ceramic substrate;

a metal plate of aluminum or an aluminum alloy, one side of the metal plate being bonded directly to the other side of said ceramic substrate; and

an electronic part bonded directly to the other side of said metal plate.

2. An electronic part mounting substrate as set forth in claim 1 , wherein said electronic part is bonded directly to the other side of said metal plate when a molten metal is solidified to form said metal plate to be bonded directly to said ceramic substrate.

3. An electronic part mounting substrate as set forth in claim 2 , wherein said electronic part is made of a material which does not produce any alloys or compounds with said molten metal.

4. An electronic part mounting substrate as set forth in claim 1 , wherein said electronic part is bonded directly to the other side of said metal plate without using any solders.

5. An electronic part mounting substrate as set forth in claim 1 , wherein said electronic part is a semiconductor chip, a resistor chip or a capacitor chip.

6. An electronic part mounting substrate as set forth in claim 1 , wherein said electronic part is an SiC chip.

7. An electronic part mounting substrate as set forth in claim 1 , wherein said metal member is made of aluminum or an aluminum alloy.

8. A power module comprising:

an electronic part mounting substrate as set forth in claim 1 , wherein said electronic part is a semiconductor chip;

a casing having electrodes, said casing being mounted on said electronic part mounting substrate, said electrodes of the casing being connected to said semiconductor chip; and

an insulating material filled in said casing.

9. An electronic part mounting substrate as set forth in claim 1 , wherein said metal member is bonded directly to the one side of said ceramic substrate.

10. An electronic part mounting substrate comprising:

a ceramic substrate;

a metal member bonded to one side of said ceramic substrate;

a single metal plate, one side of which is bonded directly to the other side of said ceramic substrate; and

an electronic part bonded directly to the other side of said metal plate,

wherein said metal member and said metal plate are made of aluminum or an aluminum alloy.

11. An electronic part mounting substrate as set forth in claim 10 , wherein said electronic part is bonded directly to the other side of said metal plate when a molten metal is solidified to form said metal plate to be bonded directly to said ceramic substrate.

12. An electronic part mounting substrate as set forth in claim 11 , wherein said electronic part is made of a material which does not produce any alloys or compounds with said molten metal.

13. An electronic part mounting substrate as set forth in claim 10 , wherein said metal member is bonded directly to the one side of said ceramic substrate.

14. An electronic part mounting substrate comprising:

a ceramic substrate;

a metal member bonded to one side of said ceramic substrate;

a metal plate, one side of the metal plate being bonded directly to the other side of said ceramic substrate; and

an electronic part bonded directly to the other side of said metal plate,

wherein said metal member and said metal plate are made of aluminum or an aluminum alloy.

15. An electronic part mounting substrate as set forth in claim 14 , wherein said electronic part is bonded directly to the other side of said metal plate when a molten metal is solidified to form said metal plate to be bonded directly to said ceramic substrate.

16. An electronic part mounting substrate as set forth in claim 15 , wherein said electronic part is made of a material which does not produce any alloys or compounds with said molten metal.

17. An electronic part mounting substrate as set forth in claim 14 , wherein said metal member is bonded directly to the one side of said ceramic substrate.