Siemens Aktiengesellschaft

Henkel Ag & Company, Kgaa

Senju Metal Industry Co., Ltd.

Alpha Assembly Solutions Inc.

Wls Karl-heinz Grasmann

Wls Karl-heinz Grasmann Weichlotanlagen-und Service

Heraeus Duetschland Gmbh & Co. Kg

Hans-Jurgen Albrecht

Klaus Wilke

Wolfgang Scheel

Wilfred John

Volker Liedke

Harald Wittrich

Minoru Ueshima

Katsuaki Suganuma

Gunnar Petzold

Klaus Müller

Werner Kruppa

Mathias Nowottnick

Hector Andrew Hamilton Steen

Klaus Wittke

Klaus Heinrich Georg Bartl

Karl H Grasmann

Gunter-Werner Strick

Karl-Heinz Grasmann

Ueshima Minoru

Suganuma Katsuaki

A solder joint which is used in power devices and the like and which can withstand a high current density without developing electromigration is formed of a Sn&#x2014;Ag&#x2014;Bi&#x2014;In based alloy. The solder joint is formed of a solder alloy consisting essentially of 2-4 mass % of Ag, 2-4 mass % of Bi, 2-5 mass % of In, and a remainder of Sn. The solder alloy may further contain at least one of Ni, Co, and Fe.

Solder alloy for power devices and solder joint having a high current density

The invention relates to a soldering material comprising an alloy that in addition to Sn (tin) as the major constituent, comprises 10 wt. % or less Ag (silver), 10 wt. % or less Bi (bismuth), 10 wt. % or less Sb (antimony) and 3 wt. % or less Cu (copper). Furthermore, the invention relates to a soldering material comprising a plurality of soldering components with such alloy compositions and contents in the soldering material that on fusing the soldering components an alloy is formed that comprises Sn, Ag, Bi, Sb and Cu in the abovementioned alloy contents.

Soldering material based on Sn Ag and Cu

Method for wave-soldering printed circuit boards

In the process according to the invention for soldering electronic boards, in particular, printed circuit boards with devices installed on them, first, during the pickling process, a condensable process material, for example, water, is introduced into flaws in the oxide layers on the soldering connection surfaces and at least partially condensed in the flaws. Then, the oxide layers are exposed to rapid heating such that the process material condensed in the flaws vaporizes explosively and thus the oxide layer breaks up and cracks off of the basis material, such that the soldering connection surfaces for the subsequent actual soldering process are brought to virgin condition. In the case of wave soldering, the rapid heating occurs preferably by means of the wave of solder itself. If non-oxide passive layers must also be removed, this occurs preferably in a preceding stage of the pickling process, during which the oxide layer is hydrophilized. For this, a plasma pretreatment is suitable. The device according to the invention has a moisturizing chamber in which the condensable process material is supplied to the hydrophilic oxide layers and absorbed by them.

Process and device for soldering electronic boards, in particular,

The invention is directed to a procedure for processing joints to be soldered, preferably printed circuit boards fitted with electric components, and an arrangement for executing this procedure, wherein the joints are subjected to plasma treatment before the soldering process. The joints may be subjected to plasma treatment separately or in the relative position necessary for the soldering process.

Procedure for processing joints to be soldered

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Berlin, Germany

Hans-Jurgen Albrecht