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- W2947821485 abstract "In this thesis the applications of microwave processing and measurement techniquesfor additive manufacture of metals by powder bed fusion (PBF) are investigated.This thesis presents an experimental setup developed for microwave heating andsintering of powder compacts using a cavity applicator. The setup uses directionallycoupled power meters to achieve the functionality of a scalar network analyser, whichallows the tracking of the resonant frequency during heating. Software is developed,which can be used to control the system and set the sample temperature using sensormeasurements as feedback. Additionally, a cavity applicator is designed using a novelmethod for breaking frequency degeneracy of the excitation mode, TE011.This thesis shows that microwave sintering acts to reduce the microwave magneticabsorption of metal powder compacts. This is confirmed through experiment wherevarious metal powders are sintered using microwave magnetic field. Measurementsof the Q0 during the process are used to monitor the change in microwave loss ofthe powder compacts. This is important as previous results focus mainly on the postsinteringproperties, while there is very little data pertaining to in-process changes.This thesis presents a technique for measuring the surface resistance using a dielectricresonator. The novelty of the technique lays in its ability to determine the systemlosses by calibration in situ. This is achieved using a lift-off design, where thedielectric can be moved vertically within the resonator. Theoretical accuracy of thistechnique is shown to be good and simulation is used to investigate the effect onaccuracy of different measurement conditions. Two prototype designs are producedand measurement results are presented for PBF manufactured metal parts, as wellas metallised plastic surfaces produced by selective laser sintering (SLS) and stereolithography (SLA)." @default.
- W2947821485 created "2019-06-07" @default.
- W2947821485 creator A5015249129 @default.
- W2947821485 date "2019-03-01" @default.
- W2947821485 modified "2023-09-24" @default.
- W2947821485 title "Microwave processing in additivemanufacturing" @default.
- W2947821485 hasPublicationYear "2019" @default.
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