Download 69th Conference on Glass Problems, CESP Volume 30, Issue 1 by Charles H. Drummond III PDF

By Charles H. Drummond III

Remain updated with this choice of papers provided on the 69th convention on Glass difficulties on the Ohio country college. subject matters contain melting and molding, refractories, and environmental concerns and new items.

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Read or Download 69th Conference on Glass Problems, CESP Volume 30, Issue 1 (Ceramic Engineering and Science Proceedings) PDF

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Extra info for 69th Conference on Glass Problems, CESP Volume 30, Issue 1 (Ceramic Engineering and Science Proceedings)

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Secondary fining will become more effective for melts that have been exposed to an efficient primary fining process delivering a melt with a low retention of dissolved gases (see figure 6). 8. CONCLUSIONS The primary fining process of glass melts is not limited to the removal of bubbles, but includes also a stripping of dissolved gases from the melt. Efficient stripping of glass melts will reduce the risk of re-boil and enables re-absorption of small bubbles, containing gases with increased solubility at decreasing temperatures.

Figure 13 Dodecagonal furnace with top and vertical bottom electrodes 40 . I Hexagonal Bottom Electrode furnace The homogeneity of the energy distribution in cross section of the tank is equal across the total high of the tank, because of the long immersion length of the bottom electrodes. The pictures indicates a maximum of the energy density around the electrodes that cause also a temperature maximum especially at the electrode tips of the inner electrodes, independently of the distance between batch layer and electrode.

Too much sulfate would result in strong foaming. 69th Conference on Glass Problems - 23 Fining of Glass Melts: What We Know about Fining Processes Today Figure 7 Schematic drawing of main glass melt,flow's in glass melting tank furnace EFFECT OF GAS ATMOSPHERE ON FINING Exposure of a glass melt to different atmospheres may have an important effect on the fining behavior'*. Some gases show a high solubility and diffusion coefficient in the silicate melt. Such gases are for instance helium (noble gas molecules with very small diameter) and water (high solubility) and infiltrate easily into the molten glass.

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