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<p>Utilization of fly ash as a matrix in composite systems offers a low-cost alternative to costlier ceramics. Ash is a waste material obtained from thermal power plants. It endangers our environment. The objective of the work is to utilize these wastes for developing a useful product. For the preparation of the composite, a powder metallurgy route is adopted. Sets of composites are prepared using fly ash and k-feldspar in different proportions. Developed products have been characterized with respect to structural, mechanical, electrical and dielectric properties. The highest reissuance of the composite has been obtained for the composition of 60% fly ash and 40% potassium feldspar (k-Feldspar). X-ray diffraction analysis&#xa0;marks the formation of the mullite phase. SEM micrograph reveals a glassy matrix with dispersion of crystalline phase and a few small pores. Vickers hardness value for the optimized composite is determined to be 212.87. Electrical resistance is measured by two probe methods. The highest resistance of the developed product is determined to be 33.17&#xa0;giga-ohms. Frequency-dependent dielectric permittivity is estimated. Results indicate a higher permittivity value within a lower frequency region. This happens due to space charge polarization. Dielectric loss is higher in low frequency region and is lower at high-frequency regions. At a frequency of 10&#xa0;MHz, the dielectric loss tangent is estimated to be 0.07. AC conductivity increases exponentially with frequency at room temperature. The developed material poses high resistance and good dielectric value suitable for electrical applications.</p>

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Performance of Dielectric Material Thermal Power Plant Waste

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • M. K. Panigrahi,
  • R. I. Ganguly,
  • R. R. Dash

摘要

Utilization of fly ash as a matrix in composite systems offers a low-cost alternative to costlier ceramics. Ash is a waste material obtained from thermal power plants. It endangers our environment. The objective of the work is to utilize these wastes for developing a useful product. For the preparation of the composite, a powder metallurgy route is adopted. Sets of composites are prepared using fly ash and k-feldspar in different proportions. Developed products have been characterized with respect to structural, mechanical, electrical and dielectric properties. The highest reissuance of the composite has been obtained for the composition of 60% fly ash and 40% potassium feldspar (k-Feldspar). X-ray diffraction analysis marks the formation of the mullite phase. SEM micrograph reveals a glassy matrix with dispersion of crystalline phase and a few small pores. Vickers hardness value for the optimized composite is determined to be 212.87. Electrical resistance is measured by two probe methods. The highest resistance of the developed product is determined to be 33.17 giga-ohms. Frequency-dependent dielectric permittivity is estimated. Results indicate a higher permittivity value within a lower frequency region. This happens due to space charge polarization. Dielectric loss is higher in low frequency region and is lower at high-frequency regions. At a frequency of 10 MHz, the dielectric loss tangent is estimated to be 0.07. AC conductivity increases exponentially with frequency at room temperature. The developed material poses high resistance and good dielectric value suitable for electrical applications.