By Donald R. Uhlmann (auth.), A. F. Wright, J. Dupuy (eds.)
Glass ••• present concerns is the court cases of a NATO complicated examine Institute held in Puerto de los angeles Cruz, Tenerife among the second and thirteenth April 1984. The pursuits of the college have been twofold. first of all to notify members of exact and constructing technolog ical functions of glassy fabrics within which primary technological know-how makes a powerful contribution, and secondly to assemble scientists from the generally diverse backgrounds of glass technology and expertise to advertise mutual figuring out and collaboration. The amorphous nation has for greater than a decade now been a renaissance of medical and technological task extending past conventional glass expertise learn. amazing advancements of amorphous fabrics were made in fields resembling metallurgy, electronics and telecommunications or even in disciplines until eventually lately much less involved by means of fabrics technology, akin to colloid chemistry, drugs and agriculture. The actual and chemical homes introduced into program the following outcome from the interplay among the glass composition and its non-crystalline constitution. One position of the fundamental study is to appreciate this interplay, which in time via improvement, is helping to increase the diversity of houses and purposes. during this assembly we was hoping to sensitize individuals to the gigantic diversity of purposes of amorphous fabrics which take advantage of their exact houses, and therefore develop destiny research. this system was once organised round seven themes, signposts of clinical and technological task within the 1980'S: optical fabrics, amorphous metals, crystallisation phenomena, digital and electric units, sol-gel preparative tools, composite fabrics and long term applications.
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Additional resources for Glass … Current Issues
A, Fig. 1 shows a series of spectra collected from a cordierite glass ceramic over short time intervals at 900°C. The shape t =117 o Fig. 1 Small angle neutron scattering from a cordierite glass during heat treatment at 900°C (ref. 12). 23 function of each curve,I(Q),may contain information on the mean crystallite size, the size distribution, and the spatial arrangement of the crystallites (8). The presence of a peak is clear evidence of a non-random spatial distribution of crystallites and of a narrow particle size distribution.
5 for a titania nucleated glass. Note in particular the temperature dependent saturation effects observed 740° and 760°C which limit the useful nucleation time, but at the same time lead to reproducibility in microstructure for a given nucleation temperature. As we lower the nucleation temperature two phenomena become important. 3 1000 5 10 15 20 NUCLEAT IO N TIM E (hou rs) Fig. 5 Nucleation response map for a titania nucleated cordierite glass, showing particle size and number density as a function of heat treatment.
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