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<p>The intrinsic brittleness of silicon concerning structural applications could be circumvented by forming composites with both ductile and brittle reinforcements. This study aims to understand the mechanical response of silicon with not only brittle but also harder (Mo,W)Si<sub>2</sub> alloy reinforcement. Spark plasma sintering was used to synthesize the novel Si- (Mo,W)Si<sub>2</sub> composite wherein the (Mo,W)Si<sub>2</sub> reinforcement was processed by high-energy ball-milling of Mo, W and Si elemental powders. The 80 wt% silicon and 20 wt% (Mo,W)Si<sub>2</sub> composite exhibited 94% relative density after spark plasma sintering at 1423&#xa0;K with an applied pressure of 75&#xa0;MPa and dwell time of 15&#xa0;min. The silicon matrix and molybdenum-tungsten disilicide (Mo,W)Si<sub>2</sub> reinforcement exhibited an average hardness of 12 GPa and 14 GPa, respectively. The 1.1&#xa0;MPa⋅m<sup>1/2</sup> indentation fracture toughness of the composite is ~ 43% higher than that of a pure silicon wafer. The (Mo,W)Si<sub>2</sub> second phase caused crack deflection and bridging, leading to an enhancement in the fracture toughness. This shows that intrinsically brittle silicon can become fracture-resistant when synthesized in the form of composites with not only ductile but also brittle reinforcements. Tough Si-(Mo,W)Si<sub>2</sub> composites could emerge as potential candidates for armor applications<i>.</i></p>

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Novel Si-based Composite with (Mo,W)Si2 Reinforcement Synthesized Using Spark Plasma Sintering

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • B. K. Samantaray,
  • S. Bakshi,
  • G. Bartarya,
  • S. Gollapudi

摘要

The intrinsic brittleness of silicon concerning structural applications could be circumvented by forming composites with both ductile and brittle reinforcements. This study aims to understand the mechanical response of silicon with not only brittle but also harder (Mo,W)Si2 alloy reinforcement. Spark plasma sintering was used to synthesize the novel Si- (Mo,W)Si2 composite wherein the (Mo,W)Si2 reinforcement was processed by high-energy ball-milling of Mo, W and Si elemental powders. The 80 wt% silicon and 20 wt% (Mo,W)Si2 composite exhibited 94% relative density after spark plasma sintering at 1423 K with an applied pressure of 75 MPa and dwell time of 15 min. The silicon matrix and molybdenum-tungsten disilicide (Mo,W)Si2 reinforcement exhibited an average hardness of 12 GPa and 14 GPa, respectively. The 1.1 MPa⋅m1/2 indentation fracture toughness of the composite is ~ 43% higher than that of a pure silicon wafer. The (Mo,W)Si2 second phase caused crack deflection and bridging, leading to an enhancement in the fracture toughness. This shows that intrinsically brittle silicon can become fracture-resistant when synthesized in the form of composites with not only ductile but also brittle reinforcements. Tough Si-(Mo,W)Si2 composites could emerge as potential candidates for armor applications.