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<p>To explore the effect of sintering temperature on the mechanical properties and clarify the relationship between their microstructure and properties of porcelain insulators, the green body of porcelain insulators were prepared by dry moulding and sintered at different temperatures. The effect of sintering temperature on bulk density, apparent porosity, water absorption, linear shrinkage, compressive strength and bending strength of the insulators were investigated. The phase composition and microstructure of the sintered specimens were obtained to explain the essential reasons for changes in mechanical properties. The results showed that the apparent porosity and water absorption decrease first and then increase with the increase of sintering temperature, and the compressive strength and bending strength increase first and then decrease with the increase of sintering temperature. The sample sintered at 1280&#xa0;°C exhibited the optimum overall properties, with the lowest apparent porosity and water absorption of 0.43% and 0.15%, the highest compressive strength and bending strength of 434.1&#xa0;MPa and 110.8&#xa0;MPa, respectively. The reinforcing effect caused by the interlocking bonding network formed by the in-situ generated rod-shaped mullite are the key factors in improving the mechanical properties.</p>

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Evolution of mechanical properties and microstructure of high alumina porcelain insulators with sintering temperature

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Yonggang Yue,
  • Lanjun Yang,
  • Xiaochuan Chong,
  • Donghai Ding,
  • Guoqing Xiao

摘要

To explore the effect of sintering temperature on the mechanical properties and clarify the relationship between their microstructure and properties of porcelain insulators, the green body of porcelain insulators were prepared by dry moulding and sintered at different temperatures. The effect of sintering temperature on bulk density, apparent porosity, water absorption, linear shrinkage, compressive strength and bending strength of the insulators were investigated. The phase composition and microstructure of the sintered specimens were obtained to explain the essential reasons for changes in mechanical properties. The results showed that the apparent porosity and water absorption decrease first and then increase with the increase of sintering temperature, and the compressive strength and bending strength increase first and then decrease with the increase of sintering temperature. The sample sintered at 1280 °C exhibited the optimum overall properties, with the lowest apparent porosity and water absorption of 0.43% and 0.15%, the highest compressive strength and bending strength of 434.1 MPa and 110.8 MPa, respectively. The reinforcing effect caused by the interlocking bonding network formed by the in-situ generated rod-shaped mullite are the key factors in improving the mechanical properties.