Surface melt glass

Measurements were performed on a potassium nitrite melt (KNO3) at 450°C. Fig. 73, curve 1 presents the spectrum obtained for a melt layer 0.05-0.1 mm thick, which was placed on a reflective surface (polished platinum). Fig. 73, curve 2 presents the inverted spectrum (relative to curve 1) of a relatively thin layer placed on an absorptive bottom surface (carbon-glass). 

Table III. Melt Glass Surface Area and Size Analysis...

For the areas that do have sufficiently low-cost electric power, the furnaces are constructed with conventional bottoms hut with superstructure only adequate lor initial heat-up. They depend on a blanket of hatch floating on the surface of ihe glass to retain the heat within the tank that is provided by the submerged electrodes. Fresh batch is added to the blanket at a rate equal to the rate of melted glass withdrawn. 

Aqueous dispersions of these two melt-processible perfluoropolymers are processed in a way similar to PTFE dispersion. FEP dispersions can be used for coating fabrics, metals, and polyimide films. They are very well suited for bonding seals and bearings from PTFE to metallic and nonmetallic components and as nonstick and low-friction coatings for metals.16 FEP can be fused completely into a continuous film in approximately 1 min at 400°C (752°F) or 40 min at 290°C (554°F).17 PFA is used to coat various surfaces, including glass fabric, glass, and metals. 

Resistance to corrosion. The resistance to corrosive attack by melts (glasses, slags, molten metals) and vapours or foreign substances settling on the surface, for example in contact with flue gases, is one of the decisive criteria for the application of a certain refractory. 

Core-drilled samples were taken from the in-pot melting glass canisters after the canisters had been stored almost three years and had received 1 X 10 rad or more of radiation. Leach data from the core-drilled samples are shown to bracket the nonradioactive control data in Figure 6. Differences in leach rate of the magnitudes shown are within experimental deviation these differences which are believed to be associated mainly with difficulty in determing surface areas accurately. The shape of the radioactive and nonradioactive leach rate curves for the... 

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