Aluminosilicates glass-ceramics

N. Lahl et al. Aluminosilicate Glass Ceramics as Sealant in SOFC Stacks, Solid Oxide Fuel Cells Vol. VI, Electrochemical Society Proceedings Vol. 99-19, pp. 1057-1066. 

Many aluminosilicate glass ceramics are based on framework structures of AIO4 tetrahedra, which, when crystallized, posseses low thermal expansions. This gives the glass ceramics based on them near zero expansions and thus excellent dimensional stability, thermal shock resistance, and mechanical strength. Aluminosilicate glass ceramics are used commercially as telescope mirrors, thermally stable structures for satellites and space probes, gyroscope components, heat-resistant windows, stove tops, and cookware. 

F. Ye, L. Liu, Y. Wang, Y. Zhou, B. Peng, and Q. Meng, Preparation and mechanical properties of carbon nanotube reinforced barium aluminosilicate glass-ceramic composites. Script. Mater., 55, 91 M (2006). 

F. Ye, J.M. Yang, L.T. Zhang, W.C. Zhou, Y. Zhou, and T.C. Lei. Fracture Behavior of SiC-Whisker-Reinforced Barium Aluminosilicate Glass-Ceramic Matrix Composites, J. Am. Ceram. Soc., 84, 881-3(2001). 

F. Ye, S. Chen, and M. Iwasa. Synthesis and properties of barium aluminosilicate glass-ceramic composites reinforced with in situ grown SijN4 whiskers. Script. Mater., 48, 1433-8 (2003). 

BMAS - barium-magnesium-aluminosilicate glass ceramic LAS - lithium-aluminosilicate glass ceramic)... 

Commercial lithium aluminosilicate glass-ceramics provide excellent examples of such behavior. The initial glass used for production of transparent cookware, for example, has a thermal expansion coefficient of 4 ppm K , Tg 730 °C, and T = 760 °C. After processing, the thermal expansion coefficient is == 0.5 ppm K and Tg and T can no longer be detected on an expansion curve below 1000 °C. Heat treatment results in the formation of a lithium aluminosilicate crystal which has a very low thermal expansion coefficient. Removal of lithium from the residual glassy phase also decreases the thermal expansion coefficient of that phase, while simultaneously increasing the transformation and softening temperatures. 

C. E. Lord, in Crystallization and Properties of Lithium Aluminosilicate Glass-Ceramics, M.S. Thesis, Alfred University, 1995. 

Lithium-aluminosilicate glass ceramics Supports for telescope mirrors... 

FIGURE 6-12 Nextel 720 fiber-reinforced calcium aluminosilicate glass-ceramic matrix composites show significant modulus retention following carbon interface burnout indicating matrix-to-fiber load transfer. Source Keller et al., 1997. 

N. P. Bansal, Method of Producing a Silicon Carbide Fiber Reinforced Strontium Aluminosilicate Glass-Ceramic Matrix Composite, U. S. Patent 5,389,321 February 14, 1995. 

N. P. Bansal, CVD SiC (SCS-0) Fiber-Reinforced Strontium Aluminosilicate Glass-Ceramic Composites, J. Mater. Res., 12 [3] 745-753 (1997). 

N. P. Bansal, CVD SiC Fiber-Reiirforced Barium Aluminosilicate Glass-Ceramic Matrix Composites, Mater. Sci. Eng. A, 220 [1-2] 129-139 (1996). 

G. D. Linsey, P. McCluskey, D. Murphy, and G. Levan, Processing and Properties of Barium Aluminosilicate Glass-Ceramic Matrix Composites, NASA CR 198369, August 1995. 

A. Kumar and A. G. Fox, Microstmctural Study of the Hot Corrosion of a Calcium Aluminosilicate Glass-Ceramic and a Si-C-O-Fiber-Reinforced Calcium Aluminosilicate Matrix Composite via Sodium Sulfate in Air and Argon at 900°C, J. Am. Ceram. Soc. 81, 613-623 (1998). 

A. L. Ham, J. A. Yeomans and J. F. Watts, Effect of Temperature and Particle Velocity on the Erosion of a Sihcon Carbide Continuous Fibre Reinforced Calcium Aluminosilicate Glass-Ceramic Matrix Composite, Wear 233-235, 237 245 (1999). 

FIGURE 10. Hybrid barium magnesium aluminosilicate glass-ceramic matrix composite with Nicalon fibre and SiC-whisker reinforcement. The white dots are SiC whiskers distributed in the glass-ceramic matrix. (Micrograph courtesy of Prof. K. Chawla, University of Alabama at Birmingham, USA). 

YSZ-Fecralloy joint strength specimens joined with Ag4CuO and with G-18, the barium aluminosilicate glass-ceramic sealant discussed previously. Note that the glass joints experience a substantial loss in strength beyond 10 thermal cycles at 75 °C min , whereas the mpture strength of the air-brazed specimens remains constant as a function of thermal cychng. 

Following the discussion of lithium aluminosilicate and sodium aluminosilicate glass-ceramics, the presentation of glass-ceramics in the... 

Maier V. and Muller G., "Mechanism of Oxide Nucleation in Lithium Aluminosilicate Glass-Ceramics," / Am. Ceram. Soc., 70 C, 176-178 (1989). 

Sarno R.D., Tomozawa M., "Toughening Mechanisms for Zirconia—Lithium Aluminosilicate Glass-Ceramic,"/. Mater. Sci., 30, 4380-88 (1995). 

Stewart D.R., "Ti02 and Zr02 as Nucleants in a Lithia Aluminosilicate Glass-Ceramic" pp. 83-92 in Advances in Nucleation and Crystallization in Glasses, Edited by L.L. Hench and S.W. Freiman. Special Publication 5, American Ceramic Society, Columbus, OH, 1971. 

Aluminosilicate glass-ceramic (e.g. Corning Ware ) developed. 

D.R. Stewart Ti02 und Zr02 as nucleants in a lithia aluminosilicate glass-ceramic , in L.L. Hench, S.W. Freiman, (eds.) Advances in nucleating and crystallization in glasses (Symposium of the Glass Division of the Amer. Ceram. Soc., 1971)... 

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