Sintering paste and use thereof for connecting components
The invention relates to a sintering paste consisting of: (A) 30 to 40 wt. % of silver flakes with an average particle size ranging from 1 to 20 μm, (B) 8 to 20 wt. % of silver particles with an average particle size ranging from 20 to 100 nm, (C) 30 to 45 wt. % of silver(I) oxide particles, (D) 12 to 20 wt. % of at least one organic solvent, (E) 0 to 1 wt. % of at least one polymer binder, and (F) 0 to 0.5 wt. % of at least one additive differing from constituents (A) to (E).
1 . A sintering paste consisting of:
(A) 32 to 37 wt. % of silver flakes with an average particle size ranging from 1 to 20 μm;
(B) 10 to 16 wt. % of silver particles with an average particle size ranging from 20 to 100 nm;
(C) 32 to 40 wt. % of silver(I) oxide particles;
(D) 12 to 20 wt. % of at least one organic solvent;
(E) 0 to 1 wt. % of at least one polymer binder; and
(F) 0 to 0.5 wt. % of at least one additive differing from constituents (A) to (E).
2 . The sintering paste according claim 1 , wherein the silver particles have an aspect ratio ranging from 1:1 to 5:1.
3 . The sintering paste according to claim 1 , wherein the silver(I) oxide particles have an average particle size ranging from 0.4 to 4 μm.
4 . The sintering paste according to claim 1 , wherein the at least one organic solvent is a combination of at least one terpineol with at least one dibasic ester.
5 . The sintering paste according to claim 1 , wherein the at least one polymer binder is selected from cellulose derivatives.
6 . The sintering paste according to claim 1 , wherein at least a portion of the silver particles is adhered to at least a portion of the silver flakes.
7 . A method for producing the sintering paste according to claim 1 , the method comprising mixing constituents (A) to (D) with one another, wherein constituents (A) and (B) are first premixed with one another.
8 . A method for connecting components, the method comprising:
(1) providing a sandwich arrangement, the sandwich arrangement comprising at least two components and a sintering paste according to claim 1 located between the components;
(2) optionally drying the sintering paste; and
(3) sintering the sandwich arrangement.
9 . The method according to claim 8 , wherein at least one of the at least two components consists of aluminum or an aluminum alloy.
10 . The method according to claim 8 , wherein the sintering paste is applied by means of dispensing technology.
11 . The method according to claim 8 , wherein sintering is carried out under pressure or in an unpressurized manner.
12 . The method according to claim 8 , wherein the components are component parts for electronics.
13 . A method for connecting components, the method comprising:
(1) providing a sandwich arrangement, the sandwich arrangement comprising at least two components and the sintering paste, the sintering paste produced by a method according to claim 7 and located between the components;
(2) optionally drying the sintering paste; and
(3) sintering the sandwich arrangement.
14 . The method of claim 13 , the method comprising drying the sintering paste.
15 . The method of claim 8 , the method comprising drying the sintering paste.
16 . The method according to claim 8 , wherein at least one of the at least two components comprises an aluminum contact surface or an aluminum-based contact surface by which the sandwich arrangement is made.
17 . The method according to claim 7 , wherein constituents (A) to (E) are mixed with one another.
18 . The method according to claim 7 , wherein constituents (A) to (F) are mixed with one another.
19 . The sintering paste of claim 1 , wherein at least one of the silver particles and the silver(I) oxide particles comprise an organic coating.