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Abstract <p>SiC–TiC–Ti<sub>3</sub>SiC<sub>2</sub>–TiSi<sub>2</sub> composites were obtained by spark plasma sintering of pure SiC powder with 20–40 vol % Ti<sub>3</sub>SiC<sub>2</sub> MAX phase addition. The influence of sintering parameters, including temperature, compaction pressure, and isothermal holding time, on the phase composition, microstructure and mechanical properties of the materials was studied. X-ray powder diffraction results showed that Ti<sub>3</sub>SiC<sub>2</sub> decomposes at 1400°C, while sintering at temperatures up to 1100–1300°C allows obtaining up to 100% of the Ti<sub>3</sub>SiC<sub>2</sub> product. The microstructure of the sintered composites is characterized by high open porosity 43–68%; the phase composition consists of SiC particles with inclusions of the Ti<sub>3</sub>SiC<sub>2</sub>–TiC–TiSi<sub>2</sub> composite. Flexural strength varies in the range of 7–62 MPa and depends on porosity and TiC content: the maximum value of 62 MPa was achieved for composites sintered at 1250°C, with an open porosity of 45% and a TiC content of 33 vol %. Fracture of the composites occurs via an intercrystalline mechanism, which is confirmed by the analysis of fracture surface images.</p>

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Synthesis, Structure, and Properties of SiC–TiC–Ti3SiC2–TiSi2 Composites Obtained by Spark Plasma Sintering

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • I. E. Arlashkin,
  • E. P. Sedanova,
  • S. N. Perevislov,
  • K. O. Chemerevskaya,
  • D. G. Krotkevich

摘要

Abstract

SiC–TiC–Ti3SiC2–TiSi2 composites were obtained by spark plasma sintering of pure SiC powder with 20–40 vol % Ti3SiC2 MAX phase addition. The influence of sintering parameters, including temperature, compaction pressure, and isothermal holding time, on the phase composition, microstructure and mechanical properties of the materials was studied. X-ray powder diffraction results showed that Ti3SiC2 decomposes at 1400°C, while sintering at temperatures up to 1100–1300°C allows obtaining up to 100% of the Ti3SiC2 product. The microstructure of the sintered composites is characterized by high open porosity 43–68%; the phase composition consists of SiC particles with inclusions of the Ti3SiC2–TiC–TiSi2 composite. Flexural strength varies in the range of 7–62 MPa and depends on porosity and TiC content: the maximum value of 62 MPa was achieved for composites sintered at 1250°C, with an open porosity of 45% and a TiC content of 33 vol %. Fracture of the composites occurs via an intercrystalline mechanism, which is confirmed by the analysis of fracture surface images.