2. Author's Information
    Kevin Florio
    Institute of Machine Tools and Manufacturing, ETH – Swiss Federal Institute of Technology Zurich, Leonhardstrasse 21, 8092 Zurich, Switzerland

    Stefan Pfeiffer
    Laboratory for High Performance Ceramics, Empa − Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland

    Malgorzata Makowska
    Photon Science Division, Paul Scherrer Institut, 5232 Villigen, PSI, Switzerland

    Dario Ferreira Sanchez
    Photon Science Division, Paul Scherrer Institut, 5232 Villigen, PSI, Switzerland

    Helena Van Swygenhoven
    Photon Science Division, Paul Scherrer Institut, 5232 Villigen, PSI, Switzerland

    Christos G. Aneziris
    Institute of Ceramic, Glass and Construction Materials, TU Bergakademie Freiberg, Agricolastraße 17, 09599 Freiberg, Germany

    Konrad Wegener
    Institute of Machine Tools and Manufacturing, ETH – Swiss Federal Institute of Technology Zurich, Leonhardstrasse 21, 8092 Zurich, Switzerland

    Thomas Graule
    Laboratory for High Performance Ceramics, Empa − Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
  3. Abstract
    Powder bed density, flowability, and laser light absorption of the powder strongly influence the quality and performance of aluminum oxide parts processed by selective laser sintering and melting. By means of spray drying, highly dense granules with a good flowability are manufactured. An ultrasonic atomizer and a co‐current droplet air mixing are used to spray aqueous slurries consisting of either bimodal or trimodal distributions of aluminum oxide. Nano‐iron oxide improves the interaction with the green pulsed laser. The improved absorption of the green laser light is verified by means of an Ulbricht sphere. The appropriate amount of dispersant for consecutive water‐based spray granulation is determined by Zeta Potential measurements. Dibasic ammonium citrate is found to be the most suitable dispersant. A final uniform distribution of the iron oxide within the spray dried granules is confirmed by X‐ray μ‐beam fluorescence tomography. The powder quality is characterized by apparent density, tapped density, Hausner ratio, moisture content, and particle size distribution. Powders with a tapped density of almost 50% of the theoretical density and an absorbance of 69% (green laser light) lead to maximum densities of the laser processed parts of around 96%.
    Keywords
    additive manufacturing, aluminum oxide, nano powder dispersing, SLS/SLM, spray granulation, μ‐beam X‐ray fluorescence (μXRF) tomography
    DOI: 10.1002/adem.201801351
    ADLID: 70036-v5
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  1. Keywords
    additive manufacturing aluminum oxide nano powder dispersing SLS/SLM spray granulation μ‐beam X‐ray fluorescence (μXRF) tomography
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