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Thermal conductivity of salvaged fused cast alumina used in the glass industry

Journal Article · · International Journal of Ceramic Engineering & Science
DOI:https://doi.org/10.1002/ces2.10137· OSTI ID:1871898
 [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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Fused cast alumina (FCA) has been and continues to be used as a refractory material in energy intensive industries such as glass melting and chemical processing. In-service degradation due to high temperature exposure in harsh environment affects the designed furnace thermal profiles and energy consumption. Phase transformation may occur at the refractory hot face during glass melting altering the properties. Three FCA blocks recovered from industrial furnaces were investigated in this study. The as-received FCA consists primarily of a mixture of alpha (α) and beta (β) alumina that has a thermal conductivity value of 5–6 W/mK. The Hot Disk method was used to obtain thermal conductivity directly on the refractory blocks. At the hot face, a transformation from β to α alumina occurred and was confirmed by an X-ray diffraction study. Thermal conductivity measurements as a function of position also showed a clear transition from β to α alumina at both ends of a complete block with no voids. Thermal conductivity of the α alumina tripled compared to β alumina. This study provides important information of heat transfer and thermal conductivity evolution to refractory manufacturers and users.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1871898
Journal Information:
International Journal of Ceramic Engineering & Science, Journal Name: International Journal of Ceramic Engineering & Science Journal Issue: 4 Vol. 4; ISSN 2578-3270
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

References (7)

Thermophysical characteristics of refractory composite materials for glass production journal May 2008
Thermophysical properties of sodium β″-alumina polycrystalline ceramic journal November 1994
Mechanical and thermal shock behavior of refractory materials for glass feeders journal June 2010
Transient plane source techniques for thermal conductivity and thermal diffusivity measurements of solid materials journal March 1991
Thermal transport studies of electrically conducting materials using the transient hot-strip technique journal May 1986
Alumina fused cast refractory aging monitored by nickel crystal chemistry journal November 1991
Refractory degradation in glass tank melters. A survey of testing methods journal December 1997

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Related Subjects

36 MATERIALS SCIENCE
fused cast alumina
hot disk
refractory
thermal conductivity