Common additive manufacturing (AM) methods use metal powder feedstock. The properties of the metal powder such as, particle size distribution (PSD), morphology, and presence of surface oxides or other contaminants, can adversely affect the quality of the final built part. Microwave material characterization techniques potentially offer effective ways by which to evaluate such metal properties. To assess sensitivity of microwave signals to the properties of metal powder used in AM, different types of metal powder were incorporated into resin composite samples, whose dielectric properties were then measured using the completely filled-waveguide technique at both X-band (8.2-12.4 GHz) and Ka-band (26.5-40 GHz). These measurements revealed that microwave signals are sensitive to changes in the metal powder properties. The findings open the door for future investigations by which optimized techniques can be devised to do the same in an in-line manner during the AM process.
 H. Taheri, M. Shoaib, L. Koester, T. Bigelow, P. Collins and L. Bond, "Powder-based additive manufacturing -a review of types of defects, generation mechanisms, detection, property evaluation and metrology," Internation journal of additive and subtractive materials manufacturing, vol. 1, no. 2, pp. 172-209, 2017.
 M. Heiden, L. Deibler, J. Rodelas, J. Koepke, D. Tung and D. Saiz, "Evolution of 316L stainless steel feedstock due to laser powder bed fusion process," Additive Manufacturing, vol. 25, pp. 84-103, 2019.
 K. Bois, L. Handjojo, A. Benally, K. Mubarak and R. Zoughi, "Dielectric Plug-loaded Two-Port Transmission Line Measurement Technique for Dielectric Property Characterization of Granular and Liquid Materials," IEEE Transactions on Instrumentation and Measurement, vol. 48, no. 6, pp. 1141-1148, 1999.
 B. Hall, "Evaluating the measurement uncertainty of complex quantities: a selective review," Metrologia, vol. 53, pp. S25-S31, 2016.
 A. Sihvola, Electromagnetic mixing formulas and applications, London: The Institute of Electrical Engineers, 1999.
12 Page Views
0 PDF Downloads
0 Facebook Shares