A Composite Material Made to Order Quality straight from the rolling mill

Transcription

1 Roll Clad Strips

2 A Composite Material Made to Order Quality straight from the rolling mill In roll cladding two or more different materials are com - bined to achieve the optimum of the best characteristics of the individual materials. Even materials which normally do not respond well to welding can be combined by the inclusion of intermediate layers. This applies to both whole surface types and to variants with individual stripes. Stamped parts from roll clad strips are used as conductors for very low level signals in the micro-ampere range and in components for special requirements in power technology. In the course of cold roll cladding, the materials which are to be combined are inserted into the rolling gap and during the subsequent roll cladding procedure the total thickness is reduced by more than 50%. The surface preparation carried out in line with the rolling ensures uniform cold roll cladding. The composite gains additional stability by means of fur ther process steps of annealing and rolling. Simultane ously, the required dimensions and technological properties are achieved by the fine adjustment of the process. Cutting and dimensional adjustment complete the manufacturing process. When the pharmacist and chemist Wilhelm Carl Heraeus first melted platinum on a scale which was interesting for industry in 1856, he laid the foundation stone for the present company Heraeus Electronics. Since then, Heraeus has again and again introduced innovations, transforming unusual technologies into viable industrial processes, thus developing into a competent partner for technical applications of precious and special metals. Today, it is impossible to imagine the global key markets without the broad range of Heraeus products. As one of the leading manufacturers of precious metal compounds, Heraeus can be found alongside the most innovative international high-tech companies, especially in the field of the industrial application of roll clad strips. 2

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5 Combining Properties Multiple Layer Semi-Finished Composite Products in a Continuous Process Roll clad materials come into their own when an individual material cannot fulfill the required properties. Through a clever combination of different materials, a composite material can be created which combines the respective individual advantages of each material, thus offering the benefits of complicated multiple layer sys tems. Up to twelve different contact material stripes can be clad parallel to each other on the carrier strip. With this process very ductile layers can be manufactured compared with electroplating. Only minimal limitations apply to the geometrical forms that can be achieved. In addition, cladding with precious metal alloys creates materials which in their operative reliability are equal to materials based on solid precious metals and in some cases are even better. For coating, materials such as precious metals can be used, or precious metal alloys on a gold, palladium and silver basis, as well as copper and copper alloys, nickel, aluminum and aluminum silicon. We would be pleased to help you in your search for the suitable material. In the production of roll clad strips we differentiate between three different production processes: Overlay coating: The carrier strip is clad with a complete surface coating on one or on both sides. Inlay coating: Inlay cladding with stripes of non-precious or precious metals which are embedded into the carrier material on one or both sides. Onlay coating: Thin stripes of contact materials are clad on one or both sides. Through the combination with known surface finishing processes such as selective electroplating or sputtering your product will meet even the most demanding func tional requirements. 5

6 Combination Possibilities and Expertise Facts and Figures Base materials for cladding Material UNS- Electrical Number conductivity [m/ mm 2 ] Cu-OFE (OF Cu) C Cu-HCP (SE Cu) C Cu-ETP (ECu57/58) C /58 CuZr0.15 C CuFe2P C CuSn0.15 C CuSn6 C CuSn8 C CuNi9Sn2 C CuNi18Zn20 C CuBe2 C Stol 76 C Stol 77 C CuZn10 C CuZn37 C CuNi44 2 Ni FeNi Al99,5 36 X6 Cr17 S X6 CrNiMoTi S X4 CrNi S X9 CrNi 18 8 S X1 CrMoTi 18 2 S Other materials available on request 6

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9 Diverse Uses Unlimited Application Possibilities Use, Purpose and Design The application possibilities of roll clad strips are diverse. They are used in almost all important areas of industry and everyday life. Due to their special properties and the relatively straightforward processing, composite materials are being used increasingly in the manufacture of components for vehicle electrical and electronic components. Roll clad strips with an aluminum-silicon surface on a copper or copper alloy carrier are used for hybrid components in vehicle electrical systems. Using the highest degree of surface purity, a reliable bond between casing and hybrid can be guaranteed. The products can be applied equally for thin and thick wire bonding. The bondability is tested by our specialists in our own laboratory. In short, roll clad strips will always be used when the limits of traditional materials are reached. Special ad vantage is taken of the change in physical properties such as thermal expansion, conductivity and high corrosion resistance. With the roll cladding process, costs and weight can be reduced and simplified delivery chains can be initiated for manufacturers. The advantages of roll clad strips have been appreciated for a long time, for it is only when the functional layer and the carrier material combine good thermal stability, good heat sink properties and a high electrical conductivity that the electrical circuit loads can be reliably transmitted. 9

10 Heraeus Your Competent Partner With our large product range, Heraeus offers you everything from one source: from the first idea to the realization of a large project. With our long years of experience, we are the competent partner at your side. Through close cooperation with our customers we continuously develop new processes and technologies for the production of surfaces for the following fields: Bonding Adhesive bonding Soldering Contact technology applications In particular the development of electronics in the construction of motor vehicles is following trends which only a few years ago were unthinkable. The integration of mechatronic components and the development of hybrid systems result in complex requirements such as high ambient tempera tures and large power losses in a small volume. Roll clad composite materials for packaging technology meet these demands particularly well and make an important contribution to the technical progress in the automotive sector. Make the most of our expertise try us today! 10

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12 The data given here is valid. We reserve the right to make alterations. E 2M /N Reu Printed in Germany Layout: 5TC Heraeus Electronics Heraeus Deutschland GmbH & Co. KG Heraeusstraße Hanau, Germany Americas Phone electronics.americas@heraeus.com Asia Pacific Phone electronics.apac@heraeus.com China Phone electronics.china@heraeus.com Europe, Middle East and Africa Phone electronics.emea@heraeus.com The descriptions and engineering data shown here have been compiled by Heraeus using commonly-accepted procedures, in conjunction with modern testing equipment, and have been compiled as according to the latest factual knowledge in our possession. The information was up-to date on the date this document was printed (latest versions can always be supplied upon request). Although the data is considered accurate, we cannot guarantee accuracy, the results obtained from its use, or any patent infringement resulting from its use (unless this is contractually and explicitly agreed in writing, in advance). The data is supplied on the condition that the user shall conduct tests to determine materials suitability for particular application.