Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 97, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2021.105499
Keywords
Tungsten; Stress-strain; Ductile behaviour; Spark plasma sintering; Sintering atmosphere; Sintering foil; Oxygen concentration; Carbon concentration
Funding
- Czech Science Foundation [20-18392S]
- Czech Academy of Sciences through the Strategy AV21 program
- Euratom research and training programme 2014-2018 [633053]
- Euratom research and training programme 2019-2020 [633053]
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The study investigates the preparation of pure tungsten samples using Field Assisted Sintering, and significant improvement in mechanical performance has been achieved for short dwell times (2 min) and vacuum or Ar + H2 atmosphere.
Good thermal conductivity, high-temperature strength and low tritium retention favour the use of tungsten as a plasma facing material for fusion reactors. However, high ductile-to-brittle transition temperature (DBTT) of tungsten limits its application. The most viable way of industrial-scale tungsten production is powder metallurgy. Conventional methods use high temperatures and long dwell times. However, this can degrade the mechanical properties of tungsten due to excessive grain growth. Therefore, new sintering techniques and unconventional sintering parameters are explored. The aim is to achieve less demanding single step processing method with the potential to improve mechanical properties. In this study, pure tungsten samples were prepared by Field Assisted Sintering using different dwell times, atmospheres and foils. The effect of the parameters on the impurity concentration was analysed and the mechanical behaviour was evaluated using stress-strain analysis. Significant improvement in mechanical performance has been reached for short dwell times (2 min) and vacuum or Ar + H2 atmosphere.
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