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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2021, Vol. 40 ›› Issue (11): 3813-3821.

• Glass • Previous Articles     Next Articles

Influence of Mixed Alkali Effect on Structure and Thermal Expansion Properties of Li2O-Al2O3-SiO2 Glass

ZENG Lin1, HUANG Shoujia1, LIN Hongjian2, ZHAO Huifeng2,3, JIANG Hong1,2,3, MA Yanping1   

  1. 1. State Key Laboratory of Marine Resources Utilization in South China Sea & Special Glass Key Lab of Hainan Province, Hainan University, Haikou 570228, China;
    2. AVIC (Hainan) Special Glass Technology Co., Ltd., Chengmai 571924, China;
    3. State Key Laboratory of Special Glass, Chengmai 571924, China
  • Received:2021-06-08 Revised:2021-07-28 Online:2021-11-15 Published:2021-12-08

Abstract: In this paper, the Li2O-Al2O3-SiO2 high alumina glass was melted by traditional high temperature melting method, and the mole ratio of alkali metal oxide n(Li2O)/n(Na2O) was changed. The influence of mixed alkali metal effect on the structure and thermal expansion performance of Li2O-Al2O3-SiO2 glass was investigated by Archimedes drainage method, thermal expansion instrument, DSC, Fourier transform infrared spectroscopy and Raman spectroscopy. The effects on the structure and thermal expansion properties of Li2O-Al2O3-SiO2 glasses are different. Results show that with the increase of n(Li2O)/n(Na2O) mole ratio, the mixed alkali metal effect has the same effect on the density and thermal expansion coefficient of Li2O-Al2O3-SiO2 glass, which increases first and then decreases, When R=0.25(R=n(Li2O)/[n(Li2O)+n(Na2O)], mole ratio) has a maximum value, the maximum density is 2.447 4 g/cm3, and the maximum thermal expansion coefficient is 7.811 7×10-6/℃. The influence on the characteristic temperature of glass gradually weakens and disappears with the increase of temperature. It can promote the crystallization behavior of glass to some extent.The influences on the silicon-oxygen tetrahedron Qn in the three-dimensional skeleton structure of glass are also different.

Key words: alkali metal oxide, silicon-oxygen tetrahedron, thermal expansion, characteristic temperature, mixed alkali effect, Li-Al-Si glass

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