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<p>In this work, laminated Nb/Ti<sub>3</sub>Al(Si)C<sub>2</sub>-TiC-Al<sub>2</sub>O<sub>3</sub> metal-ceramic composites were fabricated for the first time using the hot-pressing (HP) method. The starting materials consisted of Nb metal foils and Ti<sub>3</sub>Al(Si)C<sub>2</sub> highly filled preceramic papers. The composites were sintered at 1250&#xa0;°C under 50&#xa0;MPa for 60&#xa0;min. The microstructure and phase composition were studied using scanning electron microscopy and X-ray diffraction, while the mechanical properties were evaluated through Vickers method and three-point bending tests. The obtained results were compared with those of composites fabricated by spark plasma sintering (SPS). A heterophase reaction layer with an average thickness of 22&#xa0;μm was formed at the ceramic/metal interface, which was slightly thicker than that obtained by SPS. The stronger decomposition of the MAX phase during HP inhibited densification and altered interfacial reaction kinetics. The obtained quasi-ductility (deformation up to 5%) can be explained by the delocalized plastic deformation of Nb layers caused by multiple cracks in Ti<sub>3</sub>Al(Si)C<sub>2</sub>-based layers.</p>

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Microstructure and mechanical properties of laminated Nb/Ti3Al(Si)C2-TiC-Al2O3 composites

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Anastasia Abdulmenova,
  • Egor Kashkarov,
  • Dmitriy Krotkevich,
  • Sergey Perevislov,
  • Guifang Han,
  • Nahum Travitzky

摘要

In this work, laminated Nb/Ti3Al(Si)C2-TiC-Al2O3 metal-ceramic composites were fabricated for the first time using the hot-pressing (HP) method. The starting materials consisted of Nb metal foils and Ti3Al(Si)C2 highly filled preceramic papers. The composites were sintered at 1250 °C under 50 MPa for 60 min. The microstructure and phase composition were studied using scanning electron microscopy and X-ray diffraction, while the mechanical properties were evaluated through Vickers method and three-point bending tests. The obtained results were compared with those of composites fabricated by spark plasma sintering (SPS). A heterophase reaction layer with an average thickness of 22 μm was formed at the ceramic/metal interface, which was slightly thicker than that obtained by SPS. The stronger decomposition of the MAX phase during HP inhibited densification and altered interfacial reaction kinetics. The obtained quasi-ductility (deformation up to 5%) can be explained by the delocalized plastic deformation of Nb layers caused by multiple cracks in Ti3Al(Si)C2-based layers.