摘要:
Verfahren zum Herstellen elektrischer Schaltkreise, welche durch Edelmetalle kontaktierte und über Leiterbahnen aus Kupfer elektrisch verbundene Widerstände und gegebenenfalls Dielektrika umfassen, wobei zumindest die Kontakte (2) der Widerstände (1) aus Edelmetall und die anschließenden Leiterbahnen (4) aus Kupfer durch Aufbringen von Pasten und deren Sintern erzeugt werden. Das Sintern der Leiterbahnen (4) aus Kupfer bei Temperaturen erfolgt oberhalb von 850°C unter Stickstoffatmosphäre, wobei eine elektrisch leitende Trennschicht (5) zwischen Edelmetallkontakten (2) und Leiterbahn (4) die Bildung eines Eutektikums Edelmetall/Kupfer verhindert.
摘要:
An intaglio printing method and an intaglio printer are proposed, which are suitable for forming a wiring pattern and/or bumps such as bump electrodes on a print receiving material on which printing is to be performed, such as a substrate and a semiconductor package, using a paste or a fused metal. In addition, a method of forming the wiring pattern and the bumps such as bump electrodes on the printing substrate, using the intaglio printing method, a method for forming a wiring pattern, an apparatus for carrying out the method of forming the wiring pattern, the bump electrode and the wiring pattern are proposed.
摘要:
A tool for soldering pin-in-hole electronic circuit components includes a tool plate (10) with a set of holes (15) corresponding to the vias of a circuit board on which a circuit component is to be soldered. The board is aligned with the tool plate and hot gas is supplied through the set of holes to reflow solder in the vias. The tool is particularly suitable for use in removing a replacing circuit components. Use of particular gases allows soldering to be carried out without use of flux. Advantages of the tool are that it prevents burning the circuit board and/or unintentionally reflowing other circuit components mounted on the board.
摘要:
Disclosed is a method for making a solder joint without flux, in the presence of an inert gas. A pair of articles (10, 20) having solder-coated surfaces are heated to melt the solder, pressure is applied to the joint region, and the articles are cooled. During the heating step, inert gas in flowed over the articles.
摘要:
An essentially fluxless soldering process enables a solder coating to be applied to a surface under controlled pressure conditions enabling the volume and shape of the solder to be desirably controlled. Coatings produced by essentially fluxless processes enable joining processes to be carried out in an essentially fluxless manner with highly desirable processing flexibility.
摘要:
A method and apparatus for cleaning workpieces (16), particularly printed circuit boards upon which electrical components have been soldered, is capable of using a potentially flammable or explosive liquid cleaning solvent. In one embodiment, there are two immersion wash stages between which is a spray wash stage. The spray wash stage is formed as a closed chamber (28) which is sealed from the immersion wash stages by liquid seals (18,30). To reduce the danger of fire or explosion in the spray wash stage an inert gas such as Nitrogen is introduced into the closed chamber (28). In another embodiment the spray nozzles (3) are immersed in liquid solvent in a combined immersion/spray wash stage. This reduces atomization of the flammable solvent further reducing the danger of fire or explosion.