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Mechanistic Insight into Etching Chemistry and HF-Assisted Etching of MgO-Al2O3-SiO2 Glass-Ceramic

by Yanxin Ji 1,2, Shun Yang 1,2, Zhulian Li 1,2, Junjie Duan 1,2, Meng Xu 1,2, Hong Jiang 1,2, Changjiu Li 1,2,3,* and Yongjun Chen 1
1
State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
2
Special Glass Key Lab of Hainan Province, Haikou 570228, China
3
Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education, Haikou 570228, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(9), 1631; https://doi.org/10.3390/ma11091631
Received: 25 July 2018 / Revised: 3 September 2018 / Accepted: 4 September 2018 / Published: 6 September 2018
The present study focuses on the etching conditions and mechanism of MgO-Al2O3-SiO2 glass-ceramic (MAS) in hydrofluoric acid (HF). The results show that the amorphous phase has 218 times higher etching rate than pure cordierite crystal at room temperature. In addition, the activation energies of cordierite and amorphous phases in the HF solution are 52.5 and 30.6 kJ/mol, respectively. The time (tad) taken for complete dissolution of the amorphous phase depends on the HF concentration (CHF). Based on the etching experiments, a new model is established and refined to assess the tad evolution. In addition, a highly crystalline cordierite phase, with the high specific surface area (59.4 m2·g−1) and mesoporous structure, has been obtained by HF etching. This paper presents novel insights into the etching chemistry and opens up avenues for further research in the area of cordierite-based catalytic ceramics. View Full-Text
Keywords: glass-ceramic; hydrofluoric acid; etching condition; etch rate; mechanism glass-ceramic; hydrofluoric acid; etching condition; etch rate; mechanism
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Ji, Y.; Yang, S.; Li, Z.; Duan, J.; Xu, M.; Jiang, H.; Li, C.; Chen, Y. Mechanistic Insight into Etching Chemistry and HF-Assisted Etching of MgO-Al2O3-SiO2 Glass-Ceramic. Materials 2018, 11, 1631.

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