Mechanical properties of CaO-MgO-Al2O3-SiO2-based glass–ceramic glaze for ceramic tiles fabricated by controlled heat-treatment
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초록
Glass–ceramic glazes were prepared using a CaO-MgO-Al2O3-SiO2 system and were used to fabricate low-temperature firing,high-hardness glazes in ceramic tiles. Additives (B2O3) and a nucleating agent (TiO2) were added to the glaze, and crystallineglazes were obtained by sintering at 1000 ~ 1100 oC for 30 or 60 min. X-ray diffraction analysis of the glazes suggested thatcordierite (Mg2Al4Si5O18) and anorthite (CaAl2Si2O8) crystal phases were present, and the peak intensity of the cordieritecrystal phase increased with increasing sintering temperature. All samples showed high crystallinities of 70% or more,irrespective of sintering temperature or time. The glaze density increased with increasing sintering temperature and decreasedat 1100 oC. The Vickers hardness test results of the glazes indicated high hardness values of 6.79 and 6.77 GPa after 30 minheat treatment at 1000 oC and 60 min at 1050 oC, respectively. Glass-ceramic glaze with high hardness at low temperature wasfabricated through crystallization of glaze for tiles.
Abstract
Glass–ceramic glazes were prepared using a CaO-MgO-Al2O3-SiO2 system and were used to fabricate low-temperature firing,high-hardness glazes in ceramic tiles. Additives (B2O3) and a nucleating agent (TiO2) were added to the glaze, and crystallineglazes were obtained by sintering at 1000 ~ 1100 oC for 30 or 60 min. X-ray diffraction analysis of the glazes suggested thatcordierite (Mg2Al4Si5O18) and anorthite (CaAl2Si2O8) crystal phases were present, and the peak intensity of the cordieritecrystal phase increased with increasing sintering temperature. All samples showed high crystallinities of 70% or more,irrespective of sintering temperature or time. The glaze density increased with increasing sintering temperature and decreasedat 1100 oC. The Vickers hardness test results of the glazes indicated high hardness values of 6.79 and 6.77 GPa after 30 minheat treatment at 1000 oC and 60 min at 1050 oC, respectively. Glass-ceramic glaze with high hardness at low temperature wasfabricated through crystallization of glaze for tiles.
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