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High Strength Alumina Micro-Beams Fabricated by Inkjet Printing

Authors

  • Noah R. Philips,

    Corresponding author
    1. Mechanical Engineering Department, University of California, Santa Barbara, California
    • Materials Department, University of California, Santa Barbara, California
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    • Member, The American Ceramic Society.
  • Brett G. Compton,

    1. Materials Department, University of California, Santa Barbara, California
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    • Member, The American Ceramic Society.
  • Matthew R. Begley

    1. Mechanical Engineering Department, University of California, Santa Barbara, California
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Author to whom correspondence should be addressed. e-mail: nphilips@engineering.ucsb.edu

Abstract

Freestanding ceramic microbeams were fabricated by inkjet printing of aqueous colloidal suspensions (up to 23 vol% alumina). Their high strength (920 MPa in bending) and stiffness (E ≈ 400 GPa) is attributed to low porosity (void fraction 0.03) and a paucity of microstructural flaws. A range of ink compositions and beam thicknesses were printed using a commercial inkjet cartridge and isostatically compacted prior to firing.

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