摘要:
L'invention concerne un procédé d'élaboration de substrats d'interconnexion de circuits hybrides, du genre où l'on effectue sur un support le dépôt d'une couche épaisse d'encre ou pâte à base de métal non noble tel que le cuivre ou autre matériau à formulation "compatible cuivre", en mettant en oeuvre successivement un séchage préliminaire d'élimination des solvants à une température de l'ordre de 100°C à 150°C, une cuisson comprenant :
a) une montée en température incorporant une phase d'élimination de résines polymères, b) un palier de frittage à une température de l'ordre de 600°C à 1000°C, et c) un refroidissement temporisé. ladite cuisson étant effectuée sous atmosphère de gaz substantiellement inerte (azote et/ou argon et/ou hélium), l'atmosphère de la phase d'élimination des polymères présentant une teneur en vapeur d'eau inférieure à 15000 ppm, de préférence comprise entre 1000 et 10000 ppm, alors que l'atmosphère de frittage à haute température présente une teneur en vapeur d'eau en tout cas inférieure à 1000 ppm.
摘要:
A method of forming a hermetic flux-sintered ceramic multilayer structure with internal copper conductor comprising: (a) forming at least one green ceramic layer comprised of a thermoplastic organic binder having dispersed therein a finely divided ceramic powder and a low melting flux; (b) forming on the surface of a first green ceramic layer a pattern of copper-based conductor paste comprised of fine copper powder, a non-cellulosic binder, and a solvent for the non-cellulosic binder which is a nonsolvent for the thermoplastic organic binder in the green ceramic layer; (c) laminating a second green ceramic layer on the surface of the first ceramic layer to sandwich the pattern therebetween; (d) heating the composite structure in an ambient gas comprising a dry buffered gas mixture whereby maintaining an oxygen partial pressure sufficient to remove the organics but not to oxidize the copper.
摘要:
Method and apparatus for laser cutting sheet material (56) and especially for laser cutting composite sheet material. An inert gas shield (60, 88), preferably of nitrogen, is provided at the cutting zone to minimize charred edges of the cut material and resulting in an extremely accurate and uniform cut line. The gas shield (60, 88) can also be used to accurately position the sheet material (56) so as to lie at the focal point of the laser beam (80). Alternatively, a vacuum (68, 70) can draw the sheet material against a supporting surface (58), for positioning the sheet material (56). In a continuous process, one or more stationary lasers (72) operating on an advancing web (141) of the sheet material (56) are positioned to cut in the longitudinal direction and a movable laser is positioned to cut in the transverse direction. Mechanical expedients enable the movable laser to make a cut perpendicular to the cut made by each stationary laser (72) without interrupting the movement of the sheet material (56).
摘要:
Innerhalb eines gasdichten Reaktionsraumes (1) befindet sich in Laufrichtung vor einem Lötbad (2) wenigstens eine Düse (7), aus der Schutzgas mit einer deutlich höher als die Löttemperatur bemessenen Temperatur auf die Lötseite von Leiterplatten (5) auftrifft.
摘要:
The present invention describes a portable device for monitoring and controlling the level of residual oxygen in reflow oven atmosphere (1). This referred equipment is able to determine the quality of the atmosphere of a reflow oven, using parameters predetermined by the user. Therefore, the equipment performs the monitoring of the reflow oven atmosphere (1) controlling the level of residual oxygen of the reflow oven (1) by increasing or decreasing of the feed flow rate of nitrogen by the control that the microcontroller exerts over the proportional valve of nitrogen flow control (9), by opening or closing the valves to kept such predetermined values.
摘要:
A method for manufacturing a printed circuit board, comprising in this order the steps (i) providing a non-conductive substrate having on at least one surface - - a copper circuitry with a copper surface, wherein the copper surface is - chemically treated by (a) an oxidation and subsequent reduction reaction and/or (b) an organic compound attached to the copper surface, - a permanent, non-conductive, not fully polymerized cover layer covering at least partially said copper surface, (ii) thermally treating the substrate with the permanent, non-conductive, not fully polymerized cover layer at a temperature in the range from 140°C to 250°C in an atmosphere, which contains molecular oxygen in an amount of 100000 ppm or less, based on the total volume of the atmosphere, such that a substrate with a permanent, non-conductive cover layer is obtained, the cover layer being more polymerized compared to step (i), with the proviso: - that step (ii) is carried out after step (i) but before any metal or metal alloy is deposited onto the permanent, non-conductive, not fully polymerized cover layer, and - that in step (ii) the permanent, non-conductive, not fully polymerized cover layer is fully polymerized in solely one single thermal treating step, if the cover layer is a solder mask.
摘要:
To provide: an electronic component which comprises a copper electrode on an inorganic material substrate and wherein the adhesion strength between the substrate and the copper electrode is high, thereby achieving improved adhesion of the copper electrode; and a method for manufacturing this electronic component. An electronic component which comprises a copper electrode on an inorganic material substrate and wherein an interface layer containing copper, manganese, silicon and oxygen is provided at the interface between the substrate and the copper electrode, and the interface layer contains crystal grains that are mainly formed of copper and dispersed in the interface layer. A method for manufacturing this electronic component comprises: an interface layer formation step for forming an interface layer on the substrate; and an electrode formation step for forming the copper electrode on the interface layer.