Studies on the Physico-Mechanical and Electrical Properties of Porcelain through Enrichment of Alumina by Substituting Quartz with Calcined Bauxite
In the present study, total quartz content (30 mass-%) of a standard porcelain body was progressively substituted by iron-rich calcined bauxite of Indian source. The compacted samples were fired in the temperature range of 1170–1320 °C and subjected to various tests namely linear shrinkage, bulk density, flexural strength, apparent porosity, deep abrasion resistance, thermal expansion and electrical resistivity. The results revealed 1230 °C as the most suitable firing temperature to get desired results for the bodies containing up to 7,5 mass-% bauxite. Bodies with >7,5 mass-% and up to 30 mass-% bauxite required higher firing temperatures close to 1260 °C for achieving the required properties. The obtained physico-mechanical and electrical resistivity values indicated that substitution of quartz by bauxite up to 30 mass‑% and fired in the range of 1230–1260 °C may be considered for the production of industrial porcelain and electrical insulators.