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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/037/02/0321-0325

    • Keywords

       

      Porcelain insulators; bending strength; dielectric strength; phase structure; mullite structure.

    • Abstract

       

      In the present work, six electrical porcelain compositions with different amount of alumina and silica have been prepared and fired in an industrial furnace at 1300°C. Density, porosity, bending strength and electrical strength were measured in the samples. In order to find a relationship between properties and sample microstructures, samples were analyzed by scanning electron microscope (SEM) and x-ray diffraction (XRD) techniques. The results showed that, with chemical composition of 53.5 wt.% SiO2 and 37.5 wt.% alumina, highest electrical strength of 21.97 kV/mm was achieved in fabricated electrical porcelains. Increasing amount of alumina up to 30 wt.% decreases quartz and cristobalite phases, but increases corundum phase 3 to 5 times. SEM observation revealed that dense particles and uniform distribution of long and thin needle shaped mullite are predominant in sample microstructures with highest electrical strength.

    • Author Affiliations

       

      Arman Sedghi1 2 Nastaran Riahi-Noori3 Naser Hamidnezhad2 Mohammad Reza Salmani2

      1. Department of Materials Engineering, Imam Khomeini International University, Qazvin, Iran
      2. Faculty of Materials Engineering, Islamic Azad University, Saveh Branch, Iran
      3. Ceramic & Polymer Group, Niroo Research Institute, Tehran, Iran
    • Dates

       
  • Bulletin of Materials Science | News

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