Influence of SiO2 and Al2O3 compositional variations on glaze structure and properties
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Ceramic glazes are glassy coatings applied to ceramic product surfaces. Glaze compositions were formulated using theUnity Molecular Formula (UMF), and changes in the surface and mechanical properties, crystalline phases, ion leachingcharacteristics, and molecular structures were investigated. The results indicated that the properties of the glaze wereinfluenced by SiO2 and Al2O3 additions as well as their respective ratios. An increase in the SiO2 content reduced glossiness,whereas an increase in the Al2O3 content enhanced glossiness. Crystalline phases were observed on the glaze surface of thesamples with the highest SiO2/Al2O3 ratio of 10.5. Both α-quartz and α-cristobalite phases were formed in the heat-treatedglazed surfaces, where an increase in the SiO2 content increased the cristobalite crystalline phase fraction. Raman spectralanalyses of the glaze indicated that an increase in the SiO2/Al2O3 ratio correlated with an increased Q0 ratio. Additionally,the SiO2/Al2O3 ratio affected the hardness and ion leaching characteristics of the glaze, exhibiting contrasting trends with atransition point at approximately 8.5. The findings of this study can potentially serve as guidelines for predicting changes in theglaze properties resulting from compositional variations in the Stull diagrams.
Abstract
Ceramic glazes are glassy coatings applied to ceramic product surfaces. Glaze compositions were formulated using theUnity Molecular Formula (UMF), and changes in the surface and mechanical properties, crystalline phases, ion leachingcharacteristics, and molecular structures were investigated. The results indicated that the properties of the glaze wereinfluenced by SiO2 and Al2O3 additions as well as their respective ratios. An increase in the SiO2 content reduced glossiness,whereas an increase in the Al2O3 content enhanced glossiness. Crystalline phases were observed on the glaze surface of thesamples with the highest SiO2/Al2O3 ratio of 10.5. Both α-quartz and α-cristobalite phases were formed in the heat-treatedglazed surfaces, where an increase in the SiO2 content increased the cristobalite crystalline phase fraction. Raman spectralanalyses of the glaze indicated that an increase in the SiO2/Al2O3 ratio correlated with an increased Q0 ratio. Additionally,the SiO2/Al2O3 ratio affected the hardness and ion leaching characteristics of the glaze, exhibiting contrasting trends with atransition point at approximately 8.5. The findings of this study can potentially serve as guidelines for predicting changes in theglaze properties resulting from compositional variations in the Stull diagrams.
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