Brazing development and interfacial metallurgy study of tungsten and copper joints with eutectic gold copper brazing alloy

Easton, David and Zhang, Yuxuan and Wood, James and Galloway, Alexander and Robbie, Mikael Olsson and Hardie, Christopher (2015) Brazing development and interfacial metallurgy study of tungsten and copper joints with eutectic gold copper brazing alloy. Fusion Engineering and Design, 98-99. pp. 1956-1959. ISSN 0920-3796

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    Abstract

    Current proposals for the divertor component of a thermonuclear fusion reactor include tungsten and copper as potentially suitable materials. This paper presents the procedures developed for the successful brazing of tungsten to oxygen free high conductivity (OFHC) copper using a fusion appropriate gold based brazing alloy, Orobraze 890 (Au80Cu20). The objectives were to develop preparation techniques and brazing procedures in order to produce a repeatable, defect free butt joint for tungsten to copper. Multiple brazing methods were utilised and brazing parameters altered to achieve the best joint possible. Successful and unsuccessful brazed specimens were sectioned and analysed using optical and scanning electron microscopy, EDX analysis and ultrasonic evaluation. It has been determined that brazing with Au80Cu20 has the potential to be a suitable joining method for a tungsten to copper joint.