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<p>This study presents a synergistic strategy for fabricating Ti₃SiC₂ ceramics via in situ reactive additive manufacturing combined with pressureless sintering. Equimolar mixtures of titanium (Ti) and silicon carbide (SiC) powders were processed by selective laser melting (SLM), followed by vacuum sintering to promote phase evolution and densification. Comprehensive structural and compositional characterizations using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) revealed that rapid thermal cycling during SLM enhanced elemental diffusion and facilitated the initial formation of Ti₃SiC₂, together with TiC, TiSi₂, and Ti₅Si₃ phases. The subsequent solid-state sintering step significantly improved the crystallinity and phase purity of Ti₃SiC₂. Despite residual porosity induced by thermal mismatch and incomplete reactions, the method demonstrated the feasibility of fabricating complex-shaped MAX-phase ceramics. This work provides a promising pathway for the direct additive manufacturing of high-performance Ti₃SiC₂ components with potential applications in high-temperature structural and wear-resistant systems.</p>

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Synergistic preparation of Ti3SiC2 ceramics by in situ reactive additive manufacturing and pressureless sintering

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Huiling Tang,
  • Shiyue Guo,
  • Rusheng Zhao,
  • Fan Zhang

摘要

This study presents a synergistic strategy for fabricating Ti₃SiC₂ ceramics via in situ reactive additive manufacturing combined with pressureless sintering. Equimolar mixtures of titanium (Ti) and silicon carbide (SiC) powders were processed by selective laser melting (SLM), followed by vacuum sintering to promote phase evolution and densification. Comprehensive structural and compositional characterizations using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) revealed that rapid thermal cycling during SLM enhanced elemental diffusion and facilitated the initial formation of Ti₃SiC₂, together with TiC, TiSi₂, and Ti₅Si₃ phases. The subsequent solid-state sintering step significantly improved the crystallinity and phase purity of Ti₃SiC₂. Despite residual porosity induced by thermal mismatch and incomplete reactions, the method demonstrated the feasibility of fabricating complex-shaped MAX-phase ceramics. This work provides a promising pathway for the direct additive manufacturing of high-performance Ti₃SiC₂ components with potential applications in high-temperature structural and wear-resistant systems.