Method and device for pressure sintering connection
A method and a device for pressure sintering connection of a joining group composed of a first and a second joining partner by means of a device with a lower tool and an upper tool having the steps: providing the joining group at room temperature as an initial temperature, arranging the joining group between the supporting surface and the pressure surface, wherein the joining group has no direct thermal contact with the supporting surface and no direct thermal contact with the pressure surface, introducing pressure onto the joining group, wherein at the start of the introduction of pressure the starting temperature of the joining group is no more than 100K above an initial temperature; increasing the temperature of the sintering agent by at least 50K above the starting temperature; ending the introduction of pressure.
1 . A method for pressure sintering connection of a joining group composed of a first and a second joining partner by means of a pressure sintering device with a lower tool and an upper tool which are formed to exert a pressure of more than 5 MPa on the joining group which is arranged between a supporting surface of the lower tool and a pressure surface of the upper tool;
the lower tool with a heating apparatus and the upper tool, wherein, as a result of a movement of the upper tool towards the lower tool, the pressure of more than 5 MPa can be operably exerted on the joining group between the supporting surface of the lower tool and the pressure surface of the upper tool;
wherein a holding apparatus is formed such that, as long as the supporting surface is adequately spaced apart from the pressure surface, the joining group can be arranged on the holding means of the holding device and in movement of the pressure surface towards the supporting surface, the holding apparatus arranges the joining group on the supporting surface; and
wherein the holding device has a plurality of the pins which project out of the lower tool on the supporting surface, in the direction of the upper tool; and the plurality of pins are formed to be actively or passively movable relative to the upper tool; and wherein respective head ends of the pins that face the upper tool form the holding means;
comprising the following method steps:
A) providing the joining group at room temperature as an initial temperature;
B) arranging the joining group between the supporting surface and the pressure surface, wherein the joining group has no direct thermal contact with the supporting surface and no direct thermal contact with the pressure surface;
C) introducing a pressure onto the joining group by moving the lower tool and the upper tool towards one another, wherein at the start of the introduction of the pressure the starting temperature of the joining group and a sintering agent, which is arranged between the first and the second joining partner of the joining group, is no more than 100K above the initial temperature;
D) increasing the temperature of the sintering agent, with a heating apparatus of the lower tool, by at least 50K above the starting temperature; and
E) ending the introduction of pressure.
2 . The method, according to claim 1 , wherein:
in method step A) the joining group is arranged on a workpiece carrier surface of a workpiece carrier.
3 . The method, according to claim 2 , wherein:
at a start of method step D) at least 10% of a maximum pressure bears on the joining group.
4 . The method, according to claim 3 , wherein:
between the method steps D) and E) the sintering agent is transformed at least partially into a sintered metal and the materially bonded sintering connection is formed between the first and second joining partner.
5 . The method, according to claim 1 , wherein:
in the method step C) at the start of the introduction of pressure the starting temperature is no more than 50K above the initial temperature.
6 . The method, according to claim 4 , wherein:
the sintering agent has metal particles including non-precious metal particles; and
a proportion of the non-precious metal particles of a total mass of the metal particles of the sintering agent is more than 50%.
7 . The method, according to claim 6 , wherein:
the metal of the non-precious metal particles is selected from the group consisting of copper, tin, zinc, aluminum, nickel, titanium, magnesium, and chromium.
8 . The method, according to claim 4 , wherein:
method steps B) to E) are performed at normal pressure.
9 . The method, according to claim 8 , wherein:
method steps B) to E) are executed in a normal atmospheric air.
10 . The method, according to claim 4 , wherein:
in a method step F) which follows on from method step E) the joining group is purified with formic acid.
11 . A pressure sintering connection device, provided according to claim 1 , wherein:
the holding device further comprises:
a plurality of hooks that project out of the upper tool in the direction of the lower tool; and
the plurality of hooks are formed to be actively or passively movable in perpendicular to the direction of the lower tool.
12 . The device, according to claim 11 , wherein:
the joining group further comprises the workpiece carrier arranged on the holding device.
13 . The device, according to claim 12 , wherein:
the heating apparatus is formed to increase the temperature of the sintering agent by at least 150K.