Alumina-Mullite Porcelain as a Conpromised 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, compositions with high alumina content require additional processing or increasing sintering temperature. This results in economic disadvantages for the alumina porcelain. The introduction of alumina-mullite porcelain is an alternative material to reduce structural stresses induced by quartz and, meanwhile, lessen the operating cost caused by alumina. The works will present the compositions and effect of changing the amount of feldspar, kaolin and ball clay on the fired strength, as well as, phase and microstructure evaluation. The results will give practical guidance for the manufacturers who would like to improve their products for high-voltage applications with a slight change in their sintering condition.