4.8 Article

Evaluating the coefficient of thermal expansion of additive manufactured AlSi10Mg using microwave techniques

Journal

ADDITIVE MANUFACTURING
Volume 30, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.addma.2019.100841

Keywords

Thermal expansion; CTE; Powder bed fusion; Microwave; AlSi10Mg

Funding

  1. Engineering and Physical Sciences Research Council (EPSRC) via an ICASE studentship programme [EP/R511882/1]
  2. Renishaw Plc via an ICASE studentship programme [EP/R511882/1]
  3. EPSRC under the program Grant, GaN-DaME [EP/P00945X/1]
  4. European Research Council (ERC) Consolidator Grant 'SUPERNEMS' [647471]
  5. European Research Council (ERC) [647471] Funding Source: European Research Council (ERC)
  6. EPSRC [1912817, EP/P00945X/1] Funding Source: UKRI

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In this paper we have used laser powder bed fusion (PBF) to manufacture and characterize metal microwave components. Here we focus on a 2.5 GHz microwave cavity resonator, manufactured by PBF from the alloy AlSi10Mg. Of particular interest is its thermal expansion coefficient, especially since many microwave applications for PBF produced components will be in satellite systems where extreme ranges of temperature are experienced. We exploit the inherent resonant frequency dependence on cavity geometry, using a number of TM cavity modes, to determine the thermal expansion coefficient over the temperature range 6-450 K. Our results compare well with literature values and show that the material under test exhibits lower thermal expansion when compared with a bulk aluminium alloy alternative (6063).

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