期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 42, 期 3, 页码 1132-1140出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.11.036
关键词
Anorthite; Glass-ceramic glaze; Transparency; High hardness; Crystallization kinetics
资金
- National Natural Science Foundation of China [52102023]
- Jiangxi Provincial Natural Science Foundation [20202BABL214008]
- Project of Science and Technology Plan of Jingdezhen [20192GYZD008-11]
- Hangzhou Nabel Group Co., Ltd
A series of high hardness anorthite-based transparent glass-ceramic glazes were successfully developed for ceramic tiles, showing excellent transparency and hardness. The anorthite crystals in the glazes were lamellar-shaped, and could crystallize directly from the frit glaze at 850 degrees C.
A series of high hardness anorthite-based transparent glass-ceramic glaze was successfully developed for ceramic tiles. These glazes were prepared by mixing a high-calcium frit (denoted as HCa) that can crystallize anorthite with other fluxes. The effect of HCa content on the crystalline phase, microstructure and properties of the glaze was studied. In addition, the phase transformation, microstructure evolution and crystallization kinetics of anorthite from frit glaze were investigated in detail. The results revealed that when the HCa content was 45-55 wt%, the glazes had excellent transparency with a hardness of 6.4-7.3 GPa, which was higher than conventional glazes. The XRD and SEM tests showed the crystallization of single-phase lamellar-shaped anorthite crystals up to 20-40 mu m in length. Anorthite was found to crystallize directly from the frit glaze at 850 degrees C. The laminated anorthite was composed of thinner lamellae, and cracks were observed inside the large crystals. The activation energy of anorthite crystallization was about 420 kJ/mol, and the Avrami index (n) was 2.03-2.36. Then value indicates that the crystal is grown in two dimensions, which explains the formation of lamellar-shaped anorthite in SEM.
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