Alumina-Mullite Porcelain as a Compromised Product for High-Voltage and Low-Sintering Insulators

抄録

Development of ceramic materials for high-voltage insulators tends to substitute the quartz portion with alumina in order to achieve greater product reliability. However, the compositions with high alumina content require additional processing or increasing sintering temperature resulting in an economic disadvantage for the alumina porcelain. The introduction of alumina-mullite porcelain is another alternative which reduces structural stresses induced by quartz and, at the same time, lower the operating cost. This work will present the effect of changing composition by varying the amount of raw materials on the fired strength along with an evaluation of phases and microstructures. The results will give practical guidance for the manufacturers who need to improve their products for high-voltage applications with a slight change in the sintering conditions.