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Effect of quartz particle size on the thermal expansion of porous whiteware bodies
Three compositions for a typical porous whiteware body were used, which differs only in the quartz particle-size distribution. The effect of the particle size-distribution of the quartz on the thermal expansion of the ceramic body was examined. The specimens were fired with a typical wall tile thermal cycle, using three different peak temperatures (1050 deg C, 100 deg C and 1150 deg C). The bulk density, the percentage of quartz, the apparent porosity, water absorption and the thermal expansion of the fired bodies were determined. The numerically derived thermal expansion curve was used to calculate the main coefficient of expansion between 100 deg C and 650 deg C in the heating stretch and the difference between the maximum coefficient of expansion values in the heating stretch and in the cooling stretch. A hysteresis between the heating and cooling stretches was found, which yielded a noticeable difference in the coefficients of expansion in these segments in the region approaching 573 deg C. The origin of the hysteresis was related to microcracks formation, which depends on the particle size distribution of the quartz phase.
Effect of quartz particle size on the thermal expansion of porous whiteware bodies
Three compositions for a typical porous whiteware body were used, which differs only in the quartz particle-size distribution. The effect of the particle size-distribution of the quartz on the thermal expansion of the ceramic body was examined. The specimens were fired with a typical wall tile thermal cycle, using three different peak temperatures (1050 deg C, 100 deg C and 1150 deg C). The bulk density, the percentage of quartz, the apparent porosity, water absorption and the thermal expansion of the fired bodies were determined. The numerically derived thermal expansion curve was used to calculate the main coefficient of expansion between 100 deg C and 650 deg C in the heating stretch and the difference between the maximum coefficient of expansion values in the heating stretch and in the cooling stretch. A hysteresis between the heating and cooling stretches was found, which yielded a noticeable difference in the coefficients of expansion in these segments in the region approaching 573 deg C. The origin of the hysteresis was related to microcracks formation, which depends on the particle size distribution of the quartz phase.
Effect of quartz particle size on the thermal expansion of porous whiteware bodies
Einfluss der Korngrösse von Quarz auf die Wärmedehnung poröser Weißware
Amoros, J.L. (author) / Garcia, J. (author) / Orts, M.J. (author) / Mestre, S. (author) / Bachero, L. (author)
2000
3 Seiten, 1 Bild, 2 Tabellen, 6 Quellen
Conference paper
English
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