Additive Manufacturing of Syntactic Foams: Part 1: Development, Properties, and Recycling Potential of Filaments

Ashish Kumar Singh, Balu Patil, Niklas Hoffmann, Brooks Saltonstall, Mrityunjay Doddamani, Nikhil Gupta

Research output: Contribution to journalArticlepeer-review

Abstract

This work focuses on developing filaments of high-density polyethylene (HDPE) and their hollow particle-filled syntactic foams for commercial three-dimensional (3D) printers based on fused filament fabrication technology. Hollow fly-ash cenospheres were blended by 40 wt.% in a HDPE matrix to produce syntactic foam (HDPE40) filaments. Further, the recycling potential was studied by pelletizing the filaments again to extrude twice (2×) and three times (3×). The filaments were tensile tested at 10−4 s−1, 10−3 s−1, and 10−2 s−1 strain rates. HDPE40 filaments show an increasing trend in modulus and strength with the strain rate. Higher density and modulus were noticed for 2× filaments compared to 1× filaments because of the crushing of some cenospheres in the extrusion cycle. However, 2× and 3× filament densities are nearly the same, showing potential for recycling them. The filaments show better properties than the same materials processed by conventional injection molding. Micro-CT scans show a uniform dispersion of cenospheres in all filaments.

Original languageEnglish (US)
Pages (from-to)1-8
Number of pages8
JournalJOM
Volume70
Issue number3
DOIs
StateAccepted/In press - Jan 24 2018

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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