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

專利號
US10785877B2
公開日期
2020-09-22
申請人
Heraeus Deutschland GmbH & Co. KG(DE Hanau)
發(fā)明人
Michael Sch?fer; Wolfgang Schmitt
IPC分類
H05K3/32; H01L23/00; B22F7/04; B22F5/00; B22F3/10; B22F3/14; B23K35/02; B23K35/30; C23C8/10; C25D11/34; H05K1/09
技術(shù)領(lǐng)域
silver,sintering,oxide,oxidizable,layer,agent,in,acid,surfaces,sintered
地域: Hanau

摘要

A method for the production of a silver sintering agent in the form of a layer-shaped silver sintering body having silver oxide surfaces and the use thereof are provided.

說明書

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CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Section 371 of international Application No. PCT/EP2015/058441, filed Apr. 17, 2015, which was published in the German language on Feb. 4, 2016 under International Publication No. WO 2016/015580 A1 and the disclosure of Which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

The invention relates to a method for the production of a silver sintering agent having silver oxide surfaces, and the use thereof in methods for the connection of components by means of pressure sintering.

US 2010/0195292 A1 discloses electronic components having a silver electrode that is provided with an external silver oxide layer. The silver oxide layer can be used for direct connection by sintering of the electronic component to a surface to be connected to it, whereby the silver oxide is reduced to silver.

US 2008/160183 A1 discloses a sintered connection method, in which a composition that can be sintered into a conductive layer and comprises organically-coated silver particles and silver oxide particles is used to produce a snuffed connection between surfaces that are to be connected. The still sinterable composition can be present in the application form of an ink, a paste or a sintering preform in the form of a layer-shaped pellet.

EP 0 579 911 A2 discloses a method for producing slurry-cast isotropic composite materials based on copper. In this context, a mixed slurry is cast onto a suitable substrate, fired, sintered, and processed through cold-rolling and tempering steps into a massive band. The composite materials can be used for the manufacture of electronic components.

權(quán)利要求

1
We claim: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.
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