Lithia glass

The resistance of PTFE to creep can be improved by blending in up to 25% of glass or asbestos fibre using PTFE dispersions as mentioned in the previous section. By the same technique alumina, silica and lithia may be incorporated to... 

Use Source of lithium, in ceramics and glass as a source of lithia and alumina. 

The most important glass-ceramic compositions are probably based on lithium silicates. The phase diagram of the Li20-Si02 system is shown in Fig. 9.16. The commercial compositions usually contain more than about 30 percent lithia which upon crystallization yields Li2Si205 as the major phase with some Si02 and Li2Si03. 

K. H. Lee, D. A. Hirschfeld and J. J. Brown, hr Situ Reinforced Glass-Ceramic in the Lithia-Alumina-Silica... 

GLASS CERAMICS Glass Ceramic Lithia aluminosilicate types (LAS) Glass Ceramic-LAS-I 9608 + + -1- -1- -1- -1- -1- ... 

Phosphoric acid, lithia and water were placed in glass tubes and sealed with a Hg stirrer. The tubes, equipped with Pt electrodes for conductivity measurements, were placed in a thermostat and stirred for at least 8 h. 

Ifthfum oxide Li20 (lithia). A white crystalline compound m.p., 1,700°C used in lubricating greases, ceramics, and glass. 

Schiffer U., "Nucleation in Parent Glasses for Lithia Alumino-Silicate Glass-Ceramic" pp. 25-38 in Low Thermal Expansion Glass-Ceramics. Edited by H. Bach. Springer, Berlin, Heidelberg, Germany, 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. 

Nucleation in Parent Glasses for Lithia Alumino-Silicate Glass Ceramics... 

In the following, a survey is given about the phenomenon of nucleation including a short review of the historical development of investigations of nucleation. (Extensive presentations of the theory of nucleation have repeatedly been described in the literature [2.40,41].) Following this, the determination of nucleation kinetics in a parent glass of a commercial lithia alumino-silicate glass ceramic will be presented. (For references to this topic see [2.42-44].)... 

In the following, some results of the investigations of nucleation kinetics in a parent glass for a commercial lithia alumino-silicate glass ceramic are presented. The composition of this glass is listed in Table 2.4. The samples used were cut from glass rods quenched in air. The number density of crystals obtained by a two-step treatment is plotted as a function of nucleation time for every fixed nucleation temperature. The conditions of the second heat treatment - the so-called treatment of development - were kept constant with Td = 1000 °C and = 4 mins to obtain comparable results. 

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)... 

T. J. Barry, L.A. Lay, R.P. Miller Nucleation efficiency in lithia-almnina-silica glasses . Discuss. Farad. Soc. 50, 214-221 (1970)... 

D.S. Tucker Dynamic fatigue of a lithia-alumina-silica glass-ceramic , J. Amer. Ceram. Soc. 73, 2528-2530 (1990)... 

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