Cordierite was synthesized using high-purity kaolin, talc, and alumina using conventional techniques for kiln-furniture application. The new raw materials subjected to magnetic separation process is to ensure total iron-free powders. The stoichiometric mixture of clay, talc, and alumina was prepared and planetary milled for several hours. The particle sizes were measured after 2, 4, 6 and 8 hours of milling respectively. The Cordierite mixtures milled at different timings were then dried at 110 oC for 24 hours. The powder blend was compacted to obtain a pellet of 12.5 mm under a uniaxial press. The pressed specimens were sent for drying and were fired at 1050, 1150, 1250, and 1350 oC. The sintered samples were subjected to Xray diffraction (XRD). The XRD analysis indicated a clear formation of Cordierite phase for the samples sintered at 1350 oC. Scanning Electron Microscopy (SEM) studies and physical properties like bulk density, specific gravity, porosity, and water absorption were studied for the identified specimens. The hardness test using Vickers hardness tester was found to be in the range of 7.4-7.6-GPa, and the hot MOR was found to be 82-92-kg/cm2. A lower porosity for the specimens was also observed. All the results suggested that the Cordierite ceramics synthesized with the desired stoichiometry could be effectively used for kiln furniture applications.

Keywords: Cordierite, Particle size, Hot MOR, Water absorption, Kiln furniture.