Spray‐dried sol‐gel glass‐ceramic powders based on the tunable thermal expansion of quartz and keatite solid solutions

Beta-spodumene glass-ceramic powder was prepared by Sol–gel route. Tetraethyl orthosilicate (TOES), aluminum nitrate, lithium carbonate were used as starting materials. X-ray powder diffraction (XRD), thermal expansion coefficient (TEC), scanning electron microscope (SEM) and transmission electron microscope (TEM) were utilized to characterize the dried LAS gels and glass-ceramic blocks. The results suggest beta-spodumene is the only crystals phase in the prepared LAS glass-ceramics powder when sintering temperature is 950 °C. The average particle size of the beta-spodumene crystal is about 30 nm with a narrow size distribution both in prepared LAS glass-ceramics powder and block. The thermal expansion coefficient of moulding pressed blocky LAS glass-ceramics is lower than 0.6×10-6 oC-1.

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Crystallization of sol-gel-derived glass ceramic powders in the CaO-MgO-Al2O3-SiO2 system

Journal of Materials Science ◽

10.1007/bf01151110 ◽

1994 ◽

Vol 29 (19) ◽

pp. 5153-5157 ◽

Cited By ~ 14

Author(s):

M. Sales ◽

J. Alarc�n

Keyword(s):

Glass Ceramic ◽

Sol Gel ◽

Ceramic Powders ◽

Sio2 System

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Characterization of 50wt%SiO2-20wt%P2O5-30wt%CaO Glass-ceramic Powders Prepared by the Sol-gel Process

Dental Materials Journal ◽

10.4012/dmj.16.117 ◽

1997 ◽

Vol 16 (2) ◽

pp. 117-126,223

Author(s):

Masayuki TAIRA ◽

Masayuki OKAZAKI ◽

Junzo TAKAHASHI

Keyword(s):

Glass Ceramic ◽

Sol Gel ◽

Ceramic Powders ◽

Sol Gel Process

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Study of the sol–gel processing of glass-ceramic powders in the SiO2–Al2O3–CaO–CaF2 system. I. Effect of powder composition on gel time and temperature

Journal of Non-Crystalline Solids ◽

10.1016/s0022-3093(99)00032-0 ◽

1999 ◽

Vol 247 (1-3) ◽

pp. 50-57 ◽

Cited By ~ 9

Author(s):

Mayard S. Zolotar ◽

Cecı́lia A.C. Zavaglia

Keyword(s):

Glass Ceramic ◽

Sol Gel ◽

Ceramic Powders ◽

Gel Time ◽

Powder Composition ◽

Gel Processing

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Crystallization of sol-gel derived glass ceramic powders in the CaO-MgO-Al2O3-SiO2 system

Journal of Materials Science ◽

10.1007/bf01184584 ◽

1995 ◽

Vol 30 (9) ◽

pp. 2341-2347 ◽

Cited By ~ 32

Author(s):

M. Sales ◽

J. Alarcon

Keyword(s):

Glass Ceramic ◽

Sol Gel ◽

Ceramic Powders ◽

Sio2 System

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Thermal Expansion Property of P2O5 Doped Lithium Aluminosilicate Glass-Ceramic Synthesized by Sol-Gel Process

Materials Science Forum ◽

10.4028/www.scientific.net/msf.663-665.1281 ◽

2010 ◽

Vol 663-665 ◽

pp. 1281-1284

Author(s):

Zhuo Hao Xiao ◽

Wen Yan Luo ◽

Sheng Long Wang

Keyword(s):

Thermal Expansion ◽

Thermal Expansion Coefficient ◽

Expansion Coefficient ◽

Glass Ceramic ◽

Sol Gel ◽

Glass Ceramics ◽

Lithium Carbonate ◽

Aluminosilicate Glass ◽

Lithium Aluminosilicate ◽

Thermal Expansion Property

Lithium aluminosilicate (LAS) glass-ceramics with 0 ~ 10 wt% phosphoric anhydride were prepared by sol-gel method and sintering at high temperature. Tetraethyl orthosilicate (TOES), aluminum nitrate, lithium carbonate were used as precursors. Differential thermal analysis (DTA), X-ray powder diffraction (XRD) and thermal expansion coefficient (TEC) were used to characterize the dried LAS gels and glass-ceramic blocks. The results suggest β-spodumene solid-solution is the only crystals phase in the P2O5 doped LAS glass-ceramics when sintering temperature is 950 oC. The thermal expansion coefficient of the P2O5 doped LAS glass-ceramics range from -0.1×10-6 oC-1 to 1.2×10-6 oC-1. Compared with the conventional melt quenching method, this process route provides a low temperature and timesaving method for preparing LAS glass-ceramics.

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