Bulletin of the Chinese Ceramic Society, Volume. 42, Issue 4, 1466(2023)
Effect of Nucleating Agent on Crystallization and Properties of Transparent Cordierite Glass-Ceramics
Cordierite silicon glass-ceramics with different nucleating agents were prepared by melting. The effects of different nucleating agents on the crystallization and properties of glass-ceramics were studied by DSC, XRD, FE-SEM, UV-VIS-NIR and other test methods, and the crystallization kinetics of glass-ceramics with different nucleating agents were analyzed using the classical kinetic equation (Johnson-Mehl-Avrami). The results indicate that the crystallization mechanism of glass-ceramics with P2O5 or P2O5+ZrO2 as nucleating agent is controlled by surface crystallization. However, the glass-ceramics with P2O5+ZrO2+TiO2 as nucleating agent has the tendency to be bulk crystallization. With the crystallization temperature increases from 950 ℃ to 980 ℃, the μ-cordierite in the three groups of glass-ceramics begins to transform into α-cordierite. While the introduction of TiO2 increases the α-cordierite content, the precipitated crystals become dense. With the extension of crystallization time, compared with other nucleating agent, the glass-ceramics with P2O5+ZrO2+TiO2 as nucleating agent obtain higher crystallinity within the same crystallization time, the increase of α-cordierite content significantly improves the mechanical properties of glass-ceramics, but decreases the light transmittance. Under the heat treatment system of 800 ℃/10 h+980 ℃/3 h, the elastic modulus of glass-ceramics with P2O5+ZrO2+TiO2 as nucleating agent reaches 103 GPa, the fracture toughness is 1.27 MPa·m1/2 and the light transmittance is 82.3%, which meet the performance requirements of mobile terminals.
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ZHENG Weihong, ZHANG Hang, GAO Zipeng, HUANG Meng, YUAN Jian, TIAN Peijing, PENG Zhigang. Effect of Nucleating Agent on Crystallization and Properties of Transparent Cordierite Glass-Ceramics[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(4): 1466
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Received: Dec. 12, 2022
Accepted: --
Published Online: Jun. 12, 2023
The Author Email: Weihong ZHENG (zhengweihong@whut.edu.cn)
CSTR:32186.14.