In-situ fabrication and characterization of W-ZrC composites via pressureless reaction sintering

Min Soo Nam, Jae Hyeong Choi, In Ho Jung, Sahn Nahm, Seongwon Kim

Research output: Contribution to journalArticlepeer-review

Abstract

This research presents a study on the fabrication and characterization of tungsten‑zirconium carbide (W-ZrC), an ultra-high temperature ceramic, using an in-situ reaction sintering method. Tungsten carbide (WC) and zirconia (ZrO2) powders were used as precursors to synthesize composites with three different ratios. The thermodynamic phase stabilities of the precursor materials were analyzed, and the reaction products were determined based on the total pressure within the system. The fabricated composites were characterized by their microstructures, porosities, hardnesses, and thermal conductivities. The results show that the composites exhibited distinct crystal phases, including those of tungsten, tungsten carbide (W2C), zirconium carbide (ZrC), and tetragonal zirconia (t-ZrO2). The reaction pathways were determined based on the composition ratios and thermodynamic stability. The composites demonstrate good densification and interparticle bonding owing to the in-situ reaction sintering process, which simplifies the fabrication and lowers processing costs. The composites also exhibited desirable properties, such as high hardness and thermal conductivity (maximum 36.4 W·m−1·K−1), making them suitable for high-temperature applications. The findings of this study contribute to the understanding of the synthesis process and properties of W-ZrC composites and provide insights for their potential applications to industries such as aerospace, defense, and nuclear energy.

Original languageEnglish
Article number106573
JournalInternational Journal of Refractory Metals and Hard Materials
Volume120
DOIs
Publication statusPublished - 2024 Apr

Bibliographical note

Publisher Copyright:
© 2024 Elsevier Ltd

Keywords

  • In-situ reaction
  • Thermal property
  • Tungsten
  • Ultra-high temperature ceramic
  • Zirconium carbide

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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