A new silver-free brazing process suitable for plasma-facing components in nuclear reactors

Article Abstract:

Research to demonstrate the viability of electrical power produced by thermonuclear fusion is ongoing. There is a need for materials combinations that can endure hostile conditions within a reactor. Solutions being evaluated involve beryllium plasma-facing elements. Silver-based brazes have shown promise as a joining route due to the high strengths than can be achieved, but silver transmutes to highly volatile cadmium. GMMT Hirst is pioneering a new approach using diffusion brazing, which is a silver-free joining method for plasma-facing assemblies.

Metal heat treating, Brazing, Methods, Nuclear fusion

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Novel low expansion packages for electronics

Article Abstract:

A project to produce A1-Si alloys rich in silicon was initiated under the European Union's BRITE/EURAM R& D programme, to examine their properties and assess their suitability for use in light-weight low-CTE packaging. The Hirst Division of GEC-Marconi Materials Technology Ltd is leading the project, with Osprey Metals, TNO Institute of Industrial Research and Alcatel-Telcom. The materials are produced using the Osprey spray-deposition method.

Primary aluminum, Primary Aluminum Production, Aluminum Alloys, Usage, Design and construction, Aluminum silicates, Alloys, Electronic packaging, Electronics packaging

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The production of large rapid prototype tools using layer manufacturing technology

Article Abstract:

Techniques for rapid prototyping and tooling are limited for size and in the materials that can be used. A new method of Metal Layer Object Manufacture (MELOM) tool manufacture is described, whereby individual layers are bonded using diffusion soldering. The method uses the silver-tin system, but copper-tin is equally suitable. It offers benefits such as speed of production for large-scale prototype tooling.

Models, Prototypes, Engineering, Engineering prototypes, Solder and soldering, Soldering, Solders, Electroplating

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