Synthesis and Physical Properties of Li-Al-Si Glass-Ceramic Materials From Petalite of Polohivka Deposit (the Ukrainian Shield)
UDC 666 + 553.493.34
https://doi.org/10.15407/mineraljournal.39.01.053
RIPENKO V.V., KHOMENKO V.M., VYSHNEVSKYI O.A., KOSORUKOV O.O.
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Av., Kyiv-142, Ukraine, 03680
E-mail: thewrm20@gmail.com
Language: Ukrainian
Mineralogical journal 2017, 39 (1): 53-62
Abstract:
Ceramic materials of general composition Li2O—Al2O3—SiO2 are used in high-tech products due to their low coefficient of thermal expansion, high hardness, chemical resistance and transparency. This paper is devoted to the experimental study of Li-glass and glass-ceramic prepared using the mineral concentrates from Ukrainian mineral deposits. As a basis of initial mixture, petalite (LiAlSi4O10) monofraction from Polohivka deposit (Ukrainian Shield) was used. Experiments were conducted using two mineral mixtures, with and without aluminum phosphate acheter viagra as additive: (1) SiO2 — 71.0 %, Al2O3 — 19.2 %, Li2O — 3.7 %, ZrO2 — 2.1 %, TiO2 — 2.1 %, P2O5 — 0 %; (2) SiO2 — 67.8 %, Al2O3 — 17.0 %, Li2O — 2.6 %, ZrO2 — 1.3 %, TiO2 — 1.6 %, P2O5 — 6.8 %. Homogeneous transparent glasses were obtained from these initial mixtures by their heat treatment in an induction furnace at 1600—1700 °C for 2.5 hours. The two-step heat treatment of the obtained samples has been conducted at 760 °C for 20 minutes and, after cooling, at 820 °C for 40 minutes. Composition of the glassy materials was studied by methods of silicate chemical analysis, electron microprobe, X-ray diffraction and scanning electron microscopy. Determination of their coefficients of thermal expansion (CTE ) was performed using the heat chamber designed by V. Kalyuzhny. Comparative study of the obtained intermediates and final products using X-ray diffraction show the presence of the nanocrystalline phases of modified silica and zircon in both samples after two stages of heating. The lowest rates of microhardness and high CTE values show the glass samples before heat treatment. CTE of samples that have passed the first stage of heat treatment (nucleation), remain almost unchanged, while microhardness values have increased by 3— 5 GPa. After the second stage of heat treatment, substantial reduction in CTE up to 1 · 10–6 K–1 and an increase in the microhardness (up to ca. 8 GPa in phosphorus containing ceramic), were documented. These changes are caused by the growth of nanocrystals of Li-containing phases and are characteristic of the process of the lithium glass ceramics formation. Experimental results show good prospects for industrial production of heat-resistant glass-ceramic materials directly from minerals of Ukrainian deposits.
Keywords: glass-ceramic materials, LA S-ceramics, petalite, nucleation, thermal expansion coefficient, microhardness, β-spodumene, β-eucryptite.
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