Method for producing a silver sintering agent having silver oxide surfaces and use of said agent in methods for joining components by pressure sintering

1. A method for producing a silver sintering agent in the form of a discrete layer-shaped silver sintering body having external silver oxide surfaces, the method comprising:

(1) applying a silver sintering preparation onto a support substrate having a surface that is incapable of forming a sintered connection;

(2) sintering the applied silver sintering preparation to form a layer-shaped silver sintering body; and

(3) detaching the layer-shaped silver sintering body formed in step (2) from the surface of the support substrate to form a discrete layer-shaped silver sintering body, wherein the silver sintering body contains no silver oxide in its mass other than the external silver oxide surfaces.

2. The method according to claim 1 , further comprising:

(4) producing or reinforcing a silver oxide layer on at least a part of the external surface of the discrete layer-shaped silver sintering body by an oxidation step after step (3).

3. The method according to claim 1 , wherein the layer-shaped silver sintering body has a layer thickness in a range of 10 to 300 μm.

4. The method according to claim 1 , wherein the support substrate having a surface that is incapable of forming a sintered connection is selected from the group consisting of aluminum oxide ceramics, nickel foils, polyimide films, polytetrafluoroethylene films, and silicone films.

5. The method according to claim 1 , wherein the silver sintering agent is present as endless ware.

6. The method according to claim 1 , wherein the silver sintering agent comprises a front side comprising a silver oxide surface and a rear side comprising a silver oxide surface.

7. The method according to claim 1 , wherein the silver oxide layer or silver oxide surface is formed by contact with air or is produced or reinforced chemically by oxidation agents or by anodic oxidation.