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<p>Silicon carbide whiskers (SiC<sub>w</sub>) are promising reinforcements for ceramic materials due to their high strength and elastic modulus. In this work, SiC/SiC<sub>w</sub>-Y<sub>2</sub>O<sub>3</sub> composite ceramics were fabricated by hot-press sintering at 1800&#xa0;°C and 40&#xa0;MPa, using 7.5&#xa0;vol.% Y<sub>2</sub>O<sub>3</sub> and varying SiC<sub>w</sub> contents (0-15&#xa0;vol.%). The effects of SiC<sub>w</sub> on microstructure, mechanical properties, and tribological behavior were systematically studied. The results show that 10&#xa0;vol.% SiC<sub>w</sub> yields the best overall performance, with improvements in relative density (97.0%), Vickers hardness (21.6&#xa0;GPa), fracture toughness (7.7&#xa0;MPa&#xa0;m<sup>1/2</sup>), and flexural strength (573.2&#xa0;MPa). However, excessive SiC<sub>w</sub> (15&#xa0;vol.%) led to decreased densification and wear resistance due to whisker agglomeration and increased porosity. The main toughening mechanisms include whisker pull-out, crack deflection, and bridging. These findings suggest that a moderate SiC<sub>w</sub> content effectively enhances the mechanical and tribological properties of SiC/SiC<sub>w</sub>-Y<sub>2</sub>O<sub>3</sub> ceramics, providing a feasible strategy for developing advanced structural ceramics.</p>

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SiC Whisker Content on the Microstructure, Mechanical, and Tribological Behaviors of Hot-Press Sintered SiC-Y2O3 Composite Ceramics

  • 期刊论文

  • 发表日期：

    2026年4月3日

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  • Guoliang Ma,
  • Shaohua Zhang,
  • Wenwen Li,
  • Sheng Dai,
  • Meng Zhang,
  • Jinfang Wang,
  • Dongdong Zhu,
  • Liu Zhu

摘要

Silicon carbide whiskers (SiCw) are promising reinforcements for ceramic materials due to their high strength and elastic modulus. In this work, SiC/SiCw-Y2O3 composite ceramics were fabricated by hot-press sintering at 1800 °C and 40 MPa, using 7.5 vol.% Y2O3 and varying SiCw contents (0-15 vol.%). The effects of SiCw on microstructure, mechanical properties, and tribological behavior were systematically studied. The results show that 10 vol.% SiCw yields the best overall performance, with improvements in relative density (97.0%), Vickers hardness (21.6 GPa), fracture toughness (7.7 MPa m1/2), and flexural strength (573.2 MPa). However, excessive SiCw (15 vol.%) led to decreased densification and wear resistance due to whisker agglomeration and increased porosity. The main toughening mechanisms include whisker pull-out, crack deflection, and bridging. These findings suggest that a moderate SiCw content effectively enhances the mechanical and tribological properties of SiC/SiCw-Y2O3 ceramics, providing a feasible strategy for developing advanced structural ceramics.