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Effect of TiO2 addition on the preparation of β-spodumene powders by sol-gel process

Published online by Cambridge University Press:  26 July 2012

Moo-Chin Wang ,
Ming-Hong Lin  and
Hok-Shing Liu
Moo-Chin Wang
Affiliation:
Department of Mechanical Engineering, National Kaohsiung Institute of Technology, Kaohsiung, 80782, Taiwan, Republic of China
Ming-Hong Lin
Affiliation:
Department of Mechanical Engineering, National Kaohsiung Institute of Technology, Kaohsiung, 80782, Taiwan, Republic of China
Hok-Shing Liu
Affiliation:
Department of Mineral and Petroleum Engineering, National Cheng-Kung University, Tainan, Taiwan, Republic of China
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Extract

This study has shown the possibility of achieving two primary considerations for the advanced fabrication of spodumene with a composition of Li2O · Al2O3 · 4SiO2 · nTiO2 (LAST) glass-ceramics by a sol-gel process, namely, an enormous reduction of sintering temperature from 1600 to 1200 °C together with the appearance of simple phases of β-spodumene/rutile as opposed to products via the conventional melting-crystallization process. Fine glass-ceramic powders with a composition of Li2O · Al2O3 · 4SiO2 (LAS) have been synthesized by the sol-gel process using Si(OC2H5)4, Al(OC2H5)3, LiOCH3, and Ti(OC2H5)4 as the starting materials. The process included well-controlled hydrolysis polycondensation of the raw alkoxides. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron diffraction (ED) analysis were utilized to study the effect of TiO2 addition on the preparation of β-spodumene powders by the sol-gel process. The gelation time of the LAST solution increases as the TiO2 content increases. For the low (<3) or high (>11) pH value, the gelation time was shortened. At pH = 5, regardless of the TiO2 content, the gel has the longest time of gelation. When the dried gels of the LAST system are heated from 800 to 1200 °C, the crystallized samples are composed of the major phase of β-spodumene and a minor phase of rutile (TiO2).

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 1 , January 1999 , pp. 196 - 203
Copyright
Copyright © Materials Research Society 1999

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