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Farzan Karimi,Saeid Baghshahi,Mohsen Nouri Khezrabad,NASTARAN RIAHI-NOORI 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
In tile and ceramic industry, frits are used for producing opaque and glossy glazes. Commonly used frits are prepared by using opacifiers such as ZrO2 and TiO2, but the high price of these raw materials leads to a higher cost of the final product. In this research, an opaque frit containing in-situ synthesized Wollastonite (CaSiO3) and Diopside (CaMgSi2O6) was developed as a substitute for Zircon-containing frits. By choosing optimized proportions of oxides in the frit composition, sufficient crystallization occurred in MgO-CaO-Al2O3-ZnO-B2O3-SiO2-K2O-Na2O glass ceramic system. XRD, SEM, EDS, STA, and colorimetry (CIELab) tests were used to compare the prepared samples with a reference zircon containing one which is used in tile industry. The results showed that whiteness and glossiness indices of the prepared sample were 73.61 and 86.56, respectively, which are comparable with those of zircon-free reference sample with whiteness and glossiness indices of 77.05 and 89.22, respectively.