Synthesis, structure and mechanical properties of ice-templated tungsten foams

@article{Rthlisberger2016SynthesisSA,
  title={Synthesis, structure and mechanical properties of ice-templated tungsten foams},
  author={Andr{\'e} R{\"o}thlisberger and Sandra H{\"a}berli and Ralph Spolenak and David C. Dunand},
  journal={Journal of Materials Research},
  year={2016},
  volume={31},
  pages={753-764}
}
Tungsten foams with directional, controlled porosity were created by directional freeze-casting of aqueous WO 3 powder slurries, subsequent freeze-drying by ice sublimation, followed by reduction and sintering under flowing hydrogen gas to form metallic tungsten. Addition of 0.51 wt% NiO to the WO 3 slurry improved the densification of tungsten cell walls significantly at sintering temperatures above 1250 °C, yielding densely sintered W–0.5 wt% Ni walls with a small fraction of closed porosity… 

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