Beryllium copper alloy bonded body and production method therefor

1. A beryllium copper alloy bonded body comprising a first member made of a beryllium copper alloy and a second member made of a beryllium copper alloy,

wherein the first member and the second member are bonded to each other via a nickel layer having a thickness of 8 μm or less.

2. The beryllium copper alloy bonded body according to claim 1 , wherein the beryllium copper alloy bonded body comprises a flow passage space in its inside.

3. The beryllium copper alloy bonded body according to claim 2 , wherein the second member has a groove, and the groove forms the flow passage space in combination with the first member.

4. The beryllium copper alloy bonded body according to claim 2 , wherein the beryllium copper alloy bonded body further comprises a third member made of a beryllium copper alloy,

wherein the third member and the first member are bonded to each other via a nickel layer having a thickness of 8 μm or less, or the third member and the second member are bonded to each other via a nickel layer having a thickness of 8 μm or less, and

wherein the second member has a slit or a groove, and the slit or the groove forms the flow passage space in combination with the first member and/or the third member.

5. A method for producing the beryllium copper alloy bonded body according to claim 1 , comprising:

providing a first member made of a beryllium copper alloy, a second member made of a beryllium copper alloy, and optionally a third member made of a beryllium copper alloy;

performing nickel plating on a surface to be bonded of the first member to form a nickel layer, a surface to be bonded of the second member to form a nickel layer, a surface to be bonded of the optional third member to form a nickel layer, or combinations thereof;

bonding by hot press the first member to the second member via intermediate nickel layer(s) and optionally bonding the optional third member to the first member or second member via intermediate nickel layer(s) to provide an intermediate bonded body;

performing a solution annealing on the intermediate bonded body; and

performing an aging treatment on the intermediate bonded body to which the solution annealing has been performed.

6. The method according to claim 5 , wherein the second member has a slit or a groove, so that the slit or the groove forms a flow passage space in the intermediate bonded body in combination with the first member and/or the third member.

7. The method according to claim 5 , further comprising, prior to the nickel plating, flattening the surface to be bonded of the first member and/or the surface to be bonded of the second member and/or the surface to be bonded of the third member.

8. The method according to claim 5 , wherein the hot press is performed at a temperature of 700 to 820° C. for 30 to 480 minutes under a pressure of 1 to 100 MPa.

9. The method according to claim 5 , wherein each of the first member and the second member, or each of the first member, the second member, and the optional third member is beryllium copper 25 alloy (UNS number C17200), and

wherein the solution annealing comprises heating at a temperature of 740 to 820° C. for 5 to 480 minutes, and a water-cooling treatment after the heating.

10. The method according to claim 5 , wherein each of the first member, the second member, and the optional third member are of a same or different composition,

wherein the first member, the second member and the optional third member are selected from the group consisting of beryllium copper 10 alloy (UNS number C17500), beryllium copper 11 alloy (UNS number C17510) and beryllium copper CEN number CW103C, and

wherein the solution annealing comprises heating at a temperature of 840 to 940° C. for 5 to 480 minutes, and a water-cooling treatment after the heating.

11. The method according to claim 5 , wherein each of the first member and the second member, or each of the first member, the second member, and the optional third member is beryllium copper 25 alloy (UNS number C17200), and

wherein the aging treatment is performed at a temperature of 280 to 340° C. for 60 to 300 minutes.

12. The method according to claim 5 , wherein each of the first member, the second member, and the optional third member are of a same or different composition,

wherein the first member, the second member and the optional third member are elected from the group consisting of beryllium copper 10 alloy (UNS number C17500), beryllium copper 11 alloy (UNS number C17510) and beryllium copper CEN number CW103C, and

wherein the aging treatment is performed at a temperature of 430 to 500° C. for 60 to 300 minutes.

13. A heat exchanger comprising a heat exchange member composed of the beryllium copper alloy bonded body according to claim 1 .

14. The heat exchanger according to claim 13 , wherein the heat exchanger is for a hydrogen station.