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<p>In this study, in situ SiC<sub>W</sub>/SiC composites were prepared by selective laser sintering (SLS) technology technique combined with precursor infiltration pyrolysis (PIP) process, and their densification and mechanical behaviors (including specimens with different molding orientations) were investigated. It was concluded that the PIP process can effectively enhance the densification of SiC<sub>W</sub>/SiC composites, with the porosity decreasing from 72.04 to 28.15% and the density increasing from 0.89 to 2.33&#xa0;g/cm<sup>3</sup>. The change rule of mechanical behavior of composites at different temperatures was investigated, and it was concluded that, at room-temperature, both whisker-containing specimens and pure SiC specimens showed an increasing trend in flexural strength and fracture toughness with the increase of the impregnation and cracking cycle, and whisker-containing specimens showed a higher fracture toughness than pure SiC specimens of the same cycle; under high-temperature conditions, the bending strength and fracture toughness of whisker-containing specimens and pure SiC specimens with the increase of the precursor infiltration pyrolysis cycle follow the same pattern as at room temperature, but the bending strength and fracture toughness of the specimens with the same precursor infiltration pyrolysis cycle show a decreasing tendency with the increase of the test temperature, and the whisker-containing specimens exhibit less loss in mechanical properties compared to pure SiC specimens, which means that the whiskers can effectively improve the specimen’s toughness. The room-temperature and high-temperature mechanical properties of the specimens with different molding directions were also investigated, and it was concluded that the highest performance was obtained for the specimens molded along 45°, followed by the specimens molded along Y and X directions. This study can provide some data support for the additive manufacturing of ceramic matrix composites.</p>

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Properties of in situ SiCW/SiC composites prepared based on selective laser sintering technology

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Decai Lu,
  • Yang Liu,
  • Ao Wang,
  • Mingxing Fan,
  • Liangliang Lu,
  • Su Cheng,
  • Zhigang Hu,
  • Liang Bo

摘要

In this study, in situ SiCW/SiC composites were prepared by selective laser sintering (SLS) technology technique combined with precursor infiltration pyrolysis (PIP) process, and their densification and mechanical behaviors (including specimens with different molding orientations) were investigated. It was concluded that the PIP process can effectively enhance the densification of SiCW/SiC composites, with the porosity decreasing from 72.04 to 28.15% and the density increasing from 0.89 to 2.33 g/cm3. The change rule of mechanical behavior of composites at different temperatures was investigated, and it was concluded that, at room-temperature, both whisker-containing specimens and pure SiC specimens showed an increasing trend in flexural strength and fracture toughness with the increase of the impregnation and cracking cycle, and whisker-containing specimens showed a higher fracture toughness than pure SiC specimens of the same cycle; under high-temperature conditions, the bending strength and fracture toughness of whisker-containing specimens and pure SiC specimens with the increase of the precursor infiltration pyrolysis cycle follow the same pattern as at room temperature, but the bending strength and fracture toughness of the specimens with the same precursor infiltration pyrolysis cycle show a decreasing tendency with the increase of the test temperature, and the whisker-containing specimens exhibit less loss in mechanical properties compared to pure SiC specimens, which means that the whiskers can effectively improve the specimen’s toughness. The room-temperature and high-temperature mechanical properties of the specimens with different molding directions were also investigated, and it was concluded that the highest performance was obtained for the specimens molded along 45°, followed by the specimens molded along Y and X directions. This study can provide some data support for the additive manufacturing of ceramic matrix composites.