Influence of compression pressure on Young’s modulus of ceramic samples

The samples used in this study are created from a porcelain mixture. This mixture is a high strength aluminous porcelain which is used in electrotechnical engineering (high voltage insulators). The porcelain mixture contains clay, kaolin, feldspar, alumina, and small amount of other admixtures. The samples are made with three different compression pressures (80, 90, and 110 MPa). Impulse excitation technique, termodilatometry, and termogravimetry are used to determine Young's modulus. The analyses are performed in the temperature range from 30 °C to 1100 °C with a heating rate of 5 °C/min in a static air atmosphere. It is found out that values of Young's modulus do not increase linearly with the compression pressure.