Published February 14, 2025 | Version v1

Tungsten wires with steel matrix composite: wetting and infiltration by steel melt

  • 1. National Research Nuclear University MEPhI, Moscow, Russia
  • 2. Joint-Stock Company "N.A. Dollezhall Research and Development Institute of Power Engineering", Moscow, Russia|National Research Nuclear University MEPhI, Moscow, Russia
  • 3. Joint-Stock Company "N.A. Dollezhall Research and Development Institute of Power Engineering", Moscow, Russia

Description

Lithium-based capillary porous systems (CPS) made of tungsten mesh are a part of the most prospective approach to plasma facing components. Currently, tungsten mesh as a part of the CPS is mounted directly on the experimental assembly without a proper joining with a substrate. Tungsten mesh filled with steel could be used as a base structure for the CPS. The experiment considers the wetting of tungsten by steel melt and the features of short- and long-term interaction between the two materials. Wetting was studied by improved sessile drop experiment. The results show that an average contact angle is 69° for SS316LN and 83.2° for SS420 melt on tungsten substrate with a temperature of 500–650 °C. Tungsten-steel composite was manufactured by infiltration of tungsten mesh with a steel melt. As a result of an active dissolution of tungsten in steel melt, (Fe,Cr)7W6 interaction layer with a thickness up to 10 µm forms around tungsten. Optimal structure with the thinnest intermetallic layer is obtained in the zones with the lowest temperature and the highest cooling speed.

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