High-temperature IR radiation conductivity of industrial glasses
conference paper
Radiation is the dominant mode of heat transfer at melting and forming temperatures of glass. The radiative properties of industrial glasses depend on temperature, glass composition, type and content of coloring ions, water content, and redox state. Because there is an obvious lack of reliable data on these radiative properties, a unique high-temperature optical test facility was built for the determination of spectral absorption in the wavelength range of 0.7-9 μm of glass at temperatures up to 1450 °C. Many of the systematic errors occurring in existing measurement methods are eliminated by the special features of this facility, which include control of the atmosphere above the melt and the redox state of the glass. The paper discusses the principle of operation based on the measurement of spectral emissivity or the ratio of spectral emissivities, the different measurement procedures, and the preliminary results obtained on clear float glass at 800, 1000, and 1200 °C.
Topics
TNO Identifier
234890
ISSN
0196-6219
Publisher
American Ceramic Society ACS
Source title
Proceedings of the 59th Conference on Glass Problems, 27-28 October 1998, Columbus, OH, USA
Place of publication
Westerville, OH, USA
Pages
47-56
Files
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