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A novel VHF heating system to aid selective laser melting

Parker, Nyle, Hefford, Samuel, Lees, Jonathan, Cripps, Stephen and Porch, Adrian 2019. A novel VHF heating system to aid selective laser melting. Presented at: 2019 IEEE MTT-S International Microwave Symposium, IMS 2019, Boston, USA, 2 -7 June 2019. -.

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Abstract

A novel approach is proposed for penetrative heating of metal powders for component manufacture using selective laser melting (SLM). Large volumes of metal powders have been shown to have unusual properties at higher RF frequencies, whereby magnetic fields can penetrate into them almost completely, at depths much greater than the expected skin depth. A resonant structure at VHF (100-500MHz) and a medium power VHF source (delivering up to 75 W) are described, analyzed and demonstrated, to efficiently heat tungsten carbide powdered samples of volumes of 40cm3 to above 7000C. Further development of this technique will help alleviate the thermal instability problems widely encountered in SLM which lead to large thermal stresses and mis-shaped components

Item Type: Conference or Workshop Item (Paper)
Status: Published
Schools: Engineering
Last Modified: 31 Jul 2020 01:33
URI: http://orca.cf.ac.uk/id/eprint/124893

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