Optimization of Contents of Three Raw Clay Materials in Formulation of a Porcelain

Formulation of traditional hard porcelain generally requires 50% kaolin, 25% silica and feldspar. Four porcelains formulation using the casting method, were prepared with different percentages kaolinitic clay, sand pegmatite referenced respectively NONG, SAB PEG. The physico-chemical, mechanical mineralogical characteristics evaluated on specimens formulated sintered at temperatures from 1200?C to 1300?C. X-ray diffraction has revealed presence mullite quartz as essentially crystalline phases. specimen 55% PEG 20% 1240?C gives better performance (water absorption: 0.17%, density: 2.42, open porosity: 0.42% flexural strength: 53.54 MPa).