Glass-ceramic Li-Al-Si-O composition and process for its product

Details Glass-ceramic Li-Al-Si-O composition and process for its product Glass-ceramic Li-Al-Si-O composition and process for its product

1992-03-30

1993-08-03

Group, Karl

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 9, 501 12, 501 32, 501 95, 264 65, 264 66, C03C 1004, C03C 1400

Patent

active

052328775

ABSTRACT:
In the process according to the invention, a gel is prepared by hydrolysis and polycondensation of precursor compounds which comprise at least silicon alcoholate and aluminum alcoholate and inorganic compounds of lithium and/or magnesium, the solvent is removed, and the gel obtained is subjected to a heat treatment resulting in dehydration and oxidation, then to compacting and ceramisization.
The composition obtained is substantially in the form of solid ceramic solutions, such as .beta.-spodumene, cordierite and mullite.

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patent: 4142879 (1979-03-01), Fritsch et al.
patent: 4588699 (1986-05-01), Brennan et al.
patent: 4608215 (1986-08-01), Gonczy et al.
patent: 4769346 (1988-09-01), Gadkavee et al.
patent: 4788162 (1988-11-01), Hillig
patent: 4853350 (1989-08-01), Ohea et al.
patent: 4857485 (1989-08-01), Brennan et al.
Journal of Non-Crystalline Solids, vol. 82, No. 1/3, Jun. 1986, "Synthesis and Preliminary Processing of the Sol-Gel Derived .beta.-Quartz Lithium Aluminum Silicates", pp. 329-342.
Journal of Materials Science Letters, vol. 6, No. 10, Oct. 1987, "Low-Temperature Cordierite Glass from Autoclave-Prepared Gel", pp. 1187-1189.
Powers et al., "SiC Fiber-Reinforced Glass-Ceramic Composites in the Zirconia/Magnesium Aluminosilicate System," Ceramic Engineering and Science Proceedings, vol. 7 (1986) Jul.-Aug., Nos. 7-8, pp. 969-977.

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