Process for the preparation of lithium aluminosilicate or gamma

Details Process for the preparation of lithium aluminosilicate or gamma Process for the preparation of lithium aluminosilicate or gamma

1995-03-06

1996-08-13

Lusignan, Michael

Coating processes

Radioactive base or coating

Particles or nuclear reactor fuel elements coated

264 05, 264 65, 501 7, 501 12, G21C 306

Patent

active

055454275

ABSTRACT:
This invention relates to a process for the preparation of lithium aluminosilicate or gamma lithium aluminate ceramics having a controlled microstructure and stoichiometry.
According to this process, mixing takes place accompanied by stirring in a short chain anhydrous alcohol of an unpolymerized liquid aluminium alkoxide and optionally a silicon alkoxide with a hydrated or unhydrated lithium hydroxide, followed by the addition of water in order to hydrolyze the mixture and obtain, after drying, beta LiAlO.sub.2 powder.
This powder can be directly compacted and then sintered at temperatures of 800.degree. to 1150.degree. C. without prior calcination giving a gamma lithium aluminate ceramic with a controlled stoichiometry and microstructure (grains of 0.1 to 10 .mu.m).

REFERENCES:
patent: 4030903 (1977-06-01), Rittler
patent: 4851373 (1989-07-01), Hench et al.
Yoldas, B. E. "Preparation of glasses and ceramics from metal-organic compounds," Journal of Materials Science 12, (1977), pp. 1203-1208.
Kinoshita, K et al., "Preparation and Characterization of Lithium Aluminate," Mat. Res. Bull. vol. 13, pp. 445-455, 1978.
Hirano, Shin-Ichi et al, "Synthesis of LiAlo.sub.2 Powder by Hydrolysis of Metal Alkoxides," J. Am. Ceram Soc., vol. 70, 1987, pp. 171-174.
Turner, Carl W. et al, "The Preparation of Lithium Aluminate by the Hydrolysis of Lithium and Aluminum Alkoxides," Advances in Ceramics, vol. 25, 1989, pp. 141-147.
Kinoshita et al, In Mat. Res. Bull, vol. 13, pp. 445-455, 1978 Rasneur, In Advances in Cermics, vol 27, 1990, pp. 63-76.
Rasneur, Bernard., "Fabrication of Large LiAlO.sub.2 Pellets, and Properties of LiAlO.sub.2 Li.sub.2 ZrO.sub.3 as Tritium Breeders for a Solid Blanket," Advanced Ceramics, vol. 27, 1990 pp. 63-76.
Alvani, Carlo et al, "Ceramics Process Versus Property Optimization of Lithium Aluminate as Tritium Breeding Material," pp. 1-8, No data.

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