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Journal Articles JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY Year : 2020

Ice-templated porous tungsten and tungsten carbide inspired by natural wood

Yuan Zhang
Guoqi Tan
  • Function : Author
Da Jiao
  • Function : Author
Jian Zhang
  • Function : Author
Shaogang Wang
  • Function : Author
Feng Liu
  • Function : Author
  • PersonId : 1016714
Longchao Zhuo
  • Function : Author
  • PersonId : 1079810
Zhefeng Zhang
  • Function : Author
Robert O Ritchie
  • Function : Author
Zengqian Liu
  • Function : Author

Abstract

The structures of tungsten and tungsten carbide scaffolds play a key role in determining the properties of their infiltrated composites for multifunctional applications. However, it is challenging to construct and control the architectures by means of self-assembly in W/WC systems because of their large densities. Here we present the development of unidirectionally porous architectures, with high porosities exceeding 65 vol.%, for W and WC scaffolds which in many respects reproduce the design motif of natural wood using a direct ice-templating technique. This was achieved by adjusting the viscosities of suspensions to retard sedimentation during freezing. The processing, structural characteristics and mechanical properties of the resulting scaffolds were investigated with the correlations between them explored. Quantitative relationships were established to describe their strengths based on the mechanics of cellular solids by taking into account both inter- and intra-lamellar pores. The fracture mechanisms were also identified, especially in light of the porosity. This study extends the effectiveness of the ice-templating technique for systems with large densities or particle sizes. It further provides preforms for developing new nature-inspired multifunctional materials, as represented by W/WC-Cu composites.
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Dates and versions

hal-02441780 , version 1 (21-10-2020)

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Yuan Zhang, Guoqi Tan, Da Jiao, Jian Zhang, Shaogang Wang, et al.. Ice-templated porous tungsten and tungsten carbide inspired by natural wood. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 2020, 45, pp.187-197. ⟨10.1016/j.jmst.2019.10.021⟩. ⟨hal-02441780⟩

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