Materials |
| Materials and Metals update Tony Cheesmar & Dave Broadley, BAE Systems, 15-Sep-09 |
| Obsolescence Issues for Materials The issues facing metallics and non-metallics show some similarities, as well as distinct differences. For all, replacement is often hampered by difficulties in defining performance requirements, particularly for ageing platforms, and the need to ensure compatibility with existing materials and service environments. However, metals are normally specified by composition, which allows their performance to be predicted with reasonable confidence, whereas non-metallics are often proprietary and are not specified (paints and coatings being an exception). This can lead to differences in long-term performance and result in long and expensive re-qualification programmes. Stephen Millington, QinetiQ, 05-Feb-08 |
| Cadmium Plating - Current Applications and Future Availability Cadmium as a sacrifial coating to protect fasteners was eliminated in automotive applications decades ago. The aircraft industry has continued to specify cadmium plating during this time, and is now one of the largest consumers of the metal. The reasons why aircraft manufacturers continue to use cadmium are reviewed, and the likelihood of a complete ban discussed. The status of hexavalent chromium coatings is also reviewed, since these are almost always specified for the passivation of cadmium. John Newnham, Confederation of British Metalforming, 05-Feb-08 |
| Alternatives to Cadmium and Hexavalent Chromium This presentation looks at the viable alternatives to cadmium electro-deposits, and hexavalent chromium based passivation processes. The various alternative electroplated coatings are evaluated with regards to the application and performance requirements of the components under consideration. Hexavalent chromium based processes have been widely used to improve the corrosion performance of a range of metallic surfaces, including zinc and zinc alloys, as well as aluminium and its alloys. Both trivalent chromium and chromium free alternatives are evaluated. Maurice Pye, MacDermid, 06-Feb-07 |
| Adhesive Obsolescence It is very rare for an adhesive to become obsolescent unless one or more of the constituent parts become unavailable due to re-classification as a chemical, such as toxic, or due to unavailability as a component part. Adhesives can also be withdrawn due to a lack of market demand, in which case a similar more modern formulation is often available. Adhesives should be looked on as a system, and not something in isolation, taking into account primers, catalysts, storage and operating conditions etc. This presentation looks at all of these. John Terry, Hitek Electronic Materials, 06-Feb-07 |
| Can plastics become obsolete Philip Charlesworth, RAPRA, 24-May-06 |
| Silver Epoxy Adhesive Joining for Lead-Free Semiconductor Packaging and Microelectronics Assembly Conductive epoxies have a long history of successful use in hi-rel hybrids, now environmental considerations have caused the electronics industry to consider their use as a solder replacement.Particularly when compared to lead free solders they offer lower temperature processing, reducing component stress and also offering the use of lower cost substrates.It can be demonstrated that when the most suitable component and substrate metallization are used, both electrical and thermal conductivity of the joints can be comparable to that of solder, and that these parameters can remain stable even under thermal stress. Peter Burgess, Promatech Ltd, 07-Feb-06 |
| Precision Casting Presentation Aeromet International plc is an international engineering and manufacturing group specialising in the manufacture of high performance components and assemblies for the Aerospace, Defence, Electronics and Autosport markets. The group is split into a Forming and Casting Division, the Forming Division specialising in Titanium and Aluminium stretch forming with all the associated finishing operations. The Casting Division comprises of Sittingbourne who produce aluminium and magnesium sand castings. Rochester and Worcester, both produce aluminium investment castings, with the Worcester facility has the capability to produce castings in the ‘Sophia’ high strength process. Both investment foundries have developed the use of rapid prototype models as patterns for low volume, short lead-time castings thus negating the need for hard cut tooling ideal for development and satisfying the needs of parts previously produced by redundant or uneconomical processes. John Zorn, Aeromet, 29-Nov-05 |
| Electrically Conductive Adhesives as a Solder Alternative Geert Luckx, Emerson & Cumming, 19-May-05 |
| A Low Volume Steel Melting Shop Phil Makin, ELG Carrs Special Steels, 18-May-05 |
| Metals Infobase Richard Boden, ILI, 23-Nov-04 |
| Keronite - Advanced Surface Technology - Electrolytic Ceramic Surfacing for Light Alloys Philip Lund, Keronite, 12-May-04 |
| Intercept Technology - A Breakthrough in Shelf-Life Extension Keith Donaldson, Engineered Materials, 27-Nov-03 |
| Obsolescence Issues for Materials Steve Milllington, QinetiQ, 26-Nov-03 |
| Cadmium Plating In Aerospace Fasteners John Newnham, SPS Technologies Ltd, 11-Feb-03 |
| WEEE/RoHS Directives: Cadmium Nick Jolly, DTI, 25-Sep-02 |
| Materials and Processes Group Report - November 2001 Roger Vance, Senlac Services, 27-Nov-01 |
| Materials and Processes Group Report - May 2001 Jeremy Franks, RNAS Yeovilton, 16-May-01 |
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