Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of_________________?
Correct answer: C. Zircon powder
- A. Graphite powder
- B. Thoria
- C. Zircon powder
- D. Beryllium
Explanation
Zircon-based ceramic coatings provide a high-emissivity refractory surface, increasing radiative heat transfer to the charge. Graphite can be emissive but is not the standard ceramic coating identified in this furnace application.
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