High-Emissivity Coatings

Cerablak® high-emissivity coatings help control radiative heat transfer by tailoring surface emissivity. High-emissivity spray-on coatings can be applied to metal and ceramic surfaces that are exposed to high temperatures in production/service, resulting in improved heat transfer, processing conditions and throughput.  


Radiative Heat Transfer 

Radiative heat transfer is particularly relevant at high temperatures where conventional thermal insulation methods are not effective. Managing this flux is key to improving process efficiencies and extending material durability in many industrial processes. The influence of radiative heat transfer is substantial, especially as temperatures increase over 600°C.


Maintaining high emissivity values in high-temperature production or service environments is the primary challenge in industrial applications. The key problem is that emissivity agents degrade in oxidizing (engine), reducing (fuel processing), and vacuum (space or semiconductor manufacturing) environments, rendering traditional coatings useless.


High-emissivity coatings also need to withstand thermal cycling, be stable and compatible with other neighboring materials, and limit diffusion of corroding species into the substrate material.


High Emissivity Surfaces Improve Efficiency and Keep Substrates Cooler
Cerablak® HTP (high-temperature paint) offers high emissivity that is stable at higher temperatures (e>0.85 up to 2200˚F), enabling thermal control to be designed into systems. The Cerablak™ material’s radiative properties are based on the naturally high emissivity of elemental carbon (which is the best black body emitter known to date), encapsulated in a long-term thermally-stable glass. Cerablak™ materials are stable in harsh environments where radiative transfer processes are typically found, including vacuum, oxidizing, and reducing conditions.