THE EFFECT OF SINTERING TEMPERATURE ON THE STRENGTH AND ELECTRICAL PROPERTIES OF PORCELAIN ALUMINA CERAMIC INSULATOR (PACI) MATERIALS
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The synthesis process of Porcelain Alumina Ceramic Insulator (PACI) material was carried out from various compositionsof kaolin, ball clay, feldspar and alumina. The composite samples were prepared through mechanical milling and compactionprocesses to obtain three ceramic composites C1, C2 and C3. The sintering process on the composite samples was carriedout at temperatures of 1200 oC and 1300 oC for 3 hours. All sample ware tested for morphology, crystal structure, elementalcomposition using SEM, XRD and XRF as well as compressive strength test and electrical properties. In sample C1, XRDresults show that increasing the sintering temperature increases the crystallite size by about 71.65% with the dominant phasebeing mullite and a little quartz making the ceramic stronger and better as an electrical insulator. Likewise, Increasing thesintering temperature of ceramic composites, especially C3, can increase their strength to around 46.27 MPa with a stabledensity of around 1.56 gr/cm3, while the combination of kaolin and alumina and sintering treatment also produce goodelectrical properties, with an optimum dielectric value at C1 of around 9.27 kV/mm. Therefore, the experimental resultsshow that the sintering process at a temperature of 1300 oC makes the porcelain insulator stronger and has better electricalproperties.
Abstract
The synthesis process of Porcelain Alumina Ceramic Insulator (PACI) material was carried out from various compositionsof kaolin, ball clay, feldspar and alumina. The composite samples were prepared through mechanical milling and compactionprocesses to obtain three ceramic composites C1, C2 and C3. The sintering process on the composite samples was carriedout at temperatures of 1200 oC and 1300 oC for 3 hours. All sample ware tested for morphology, crystal structure, elementalcomposition using SEM, XRD and XRF as well as compressive strength test and electrical properties. In sample C1, XRDresults show that increasing the sintering temperature increases the crystallite size by about 71.65% with the dominant phasebeing mullite and a little quartz making the ceramic stronger and better as an electrical insulator. Likewise, Increasing thesintering temperature of ceramic composites, especially C3, can increase their strength to around 46.27 MPa with a stabledensity of around 1.56 gr/cm3, while the combination of kaolin and alumina and sintering treatment also produce goodelectrical properties, with an optimum dielectric value at C1 of around 9.27 kV/mm. Therefore, the experimental resultsshow that the sintering process at a temperature of 1300 oC makes the porcelain insulator stronger and has better electricalproperties.