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<p>The mechanical, fatigue, creep, and water absorption characteristics of a new composite material reinforced with fibers from Abelmoschus esculentus (okra) and Si<sub>3</sub>N<sub>4</sub> bioceramic particles generated from wheat husks are examined in this work. The catalyst was methyl ethyl ketone peroxide (MEKP), and the matrix was a strong vinyl ester resin. Wheat husk was thoroughly cleaned, dried, pyrolyzed for two hours at 700&#xa0;°C, and then nitrated at 690&#xa0;°C in a nitrogen and hydrogen combination to produce Si<sub>3</sub>N<sub>4</sub> particles. The resultant Si<sub>3</sub>N<sub>4</sub> particles had a size of 180&#xa0;nm. The curing catalyst Triethylenetetramine (TETA) was added to epoxy resin and SiN<sub>4</sub> particles at room temperature in a 10:1 weight ratio to create the composite. The composites were post-cured for 48&#xa0;h after being cured for 24&#xa0;h at room temperature. Izod impact toughness of 5.21 KJ/m², hardness of 86.9 Shore-D, flexural strength of 190.3&#xa0;MPa, compression strength of 168.3&#xa0;MPa, and the highest tensile strength of 149.6&#xa0;MPa were all demonstrated by specimen VB2, which contained 40% Abelmoschus esculentus fiber and 3% Si<sub>3</sub>N<sub>4</sub>. The maximum cycles to failure in fatigue tests were 37,811 at 25% UTS, 34,211 at 50% UTS, and 31,211 at 75% UTS for VB2. At 2000s, 4000s, 6000s, 8000s, and 10,000s, respectively, VB2 showed strain values of 0.002, 0.0042, 0.0077, 0.011, and 0.018 for creep. Furthermore, the water absorption rate of VB2 was only 1.38%. Analysis using scanning electron microscopy (SEM) showed a homogeneous dispersion.A homogeneous dispersion of SiN<sub>4</sub> particles in VB2 was discovered by scanning electron microscopy (SEM) examination, demonstrating increased matrix-fiber bonding and efficient load transmission, both of which contributed to the composite’s overall improved performance.</p>

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Effect of Waste Husk Derived Si3N4 Bioceramic on Mechanical, Fatigue, Creep and Water Uptake Behaviour of Abelmoschus esculentus Fiber Vinyl Ester Composite

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • M. Arul,
  • K. Vinoth kumar,
  • G. Saravanan,
  • K. Sudhakar

摘要

The mechanical, fatigue, creep, and water absorption characteristics of a new composite material reinforced with fibers from Abelmoschus esculentus (okra) and Si3N4 bioceramic particles generated from wheat husks are examined in this work. The catalyst was methyl ethyl ketone peroxide (MEKP), and the matrix was a strong vinyl ester resin. Wheat husk was thoroughly cleaned, dried, pyrolyzed for two hours at 700 °C, and then nitrated at 690 °C in a nitrogen and hydrogen combination to produce Si3N4 particles. The resultant Si3N4 particles had a size of 180 nm. The curing catalyst Triethylenetetramine (TETA) was added to epoxy resin and SiN4 particles at room temperature in a 10:1 weight ratio to create the composite. The composites were post-cured for 48 h after being cured for 24 h at room temperature. Izod impact toughness of 5.21 KJ/m², hardness of 86.9 Shore-D, flexural strength of 190.3 MPa, compression strength of 168.3 MPa, and the highest tensile strength of 149.6 MPa were all demonstrated by specimen VB2, which contained 40% Abelmoschus esculentus fiber and 3% Si3N4. The maximum cycles to failure in fatigue tests were 37,811 at 25% UTS, 34,211 at 50% UTS, and 31,211 at 75% UTS for VB2. At 2000s, 4000s, 6000s, 8000s, and 10,000s, respectively, VB2 showed strain values of 0.002, 0.0042, 0.0077, 0.011, and 0.018 for creep. Furthermore, the water absorption rate of VB2 was only 1.38%. Analysis using scanning electron microscopy (SEM) showed a homogeneous dispersion.A homogeneous dispersion of SiN4 particles in VB2 was discovered by scanning electron microscopy (SEM) examination, demonstrating increased matrix-fiber bonding and efficient load transmission, both of which contributed to the composite’s overall improved performance.