Effect of build orientation and surface finish on surface resistance in microwave components produced by Selective Laser Melting

Clark, Nicholas ORCID: https://orcid.org/0000-0002-5306-0993, Hefford, Samuel and Porch, Adrian ORCID: https://orcid.org/0000-0001-5293-8883 2017. Effect of build orientation and surface finish on surface resistance in microwave components produced by Selective Laser Melting. Presented at: 47th European Microwave Conference (EuMC), Nuremberg, Germany, 10-12 October 2017. 2017 47th European Microwave Conference (EuMC). IEEE, pp. 508-511. 10.23919/EuMC.2017.8230901

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Abstract

A number of metal surfaces, produced by Selective Laser Melting, have been compared from a microwave perspective. Test pieces were produced in Aluminium (Al10SiMg), Titanium (Ti6Al4V) and Cobalt Chrome in two orthogonal build orientations, half of which were grit blasted. Surface resistance measurements at 5.7 GHz were taken using a “lift-off” dielectric resonator method. The losses were compared with roughness measurements from drag profilometry. Microwave losses were found not to monotonically depend on root-mean-square surface roughness, which was attributed to the different size distributions of roughness features. Grit blasting a sample typically reduced its surface resistance but the effect was much more significant in vertically produced surfaces. These results have major implications for parts used in microwave applications.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	IEEE
ISBN:	978-2-87487-047-7
Last Modified:	23 Oct 2022 13:45
URI:	https://orca.cardiff.ac.uk/id/eprint/111625

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