Microstructural and Electrical Characteristics of Sintered Aluminous Porcelain Insulators

In the present investigation, changes in the microstructural and electrical
behaviour of aluminous porcelain insulator bodies with variation
of the Al2O3 : SiO2 mole ratio from 0,15–0,70 due to substituting
quartz by technical alumina into the parent porcelain composition
has been studied during sintering at 1260 °C for 4 h. The profound
improvement of the morphological and electrical characteristics of
sintered electrical insulator bodies was evidenced with the optimal
insulator composition based on 20 mass-% substitution of quartz by
technical alumina corresponding to an Al2O3 : SiO2 mole ratio of 0,44.