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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Realizing sub-micron tungsten and tungsten composite microstructures via deformable punch spark plasma sintering
Author(s) Nachiket Shah, Nathan J Madden, Sergei Zvenigorodsky, Zachariah Koyn, Jessica A Krogstad
On-Site Speaker (Planned) Nachiket Shah
Abstract Scope Tungsten is an attractive refractory material for future fusion reactor applications because of its high melting point, good thermal conductivity, and high sputter threshold. While dense polycrystalline tungsten has been fabricated before using powder processing methods, the potential for finer grain structures possible via a lower temperature processing regime has not been fully explored. In this work, a modified high pressure die stack setup was used in a spark plasma sintering (SPS) machine to manufacture high density, sub-micron grained pure tungsten samples. Processing parameters such as pressure and hold temperature were systematically varied to observe changes in microstructure and mechanical properties. Additional compositional regimes were explored by incorporating composite-forming carbide additives. Our results show that sintered tungsten samples with reasonably high densities (>80%) and high microhardness values (up to 387 kgf/mm2) can be fabricated at pressures between 500-750MPa and at temperatures under a third of its melting point (<0.3Tm).
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Powder Materials, Mechanical Properties


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