High Emissivity Paint for Aluminium Surface

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Discussion Overview

The discussion centers around the suitability of using high emissivity paint on aluminum surfaces for a furnace application, specifically regarding temperature resistance and material choice.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant inquires about a high emissivity paint suitable for aluminum surfaces that can withstand temperatures up to 500 degrees Celsius.
  • Another participant suggests that using metal for a furnace is unconventional, recommending insulating firebrick or ceramic instead for high-temperature applications.
  • A further reply warns that an aluminum furnace could be at risk of melting or deforming at high temperatures, advocating for the use of cast iron or sheet steel with firebrick or ceramic lining instead.
  • The original poster clarifies that their furnace is intended for low temperature applications, specifically below 500 degrees Celsius.

Areas of Agreement / Disagreement

Participants express differing views on the appropriateness of aluminum for furnace construction, with some advocating for alternative materials due to concerns about temperature resistance. The discussion remains unresolved regarding the best approach for the intended application.

chiragk
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Hey,

I am making a furnace...which uses Aluminium material. Does anyone knows a paint which can be used for applying on Aluminium Surface and which works upto 500 degree Celsius and has high emissivity.
 
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You are making a furnace out of metal? An insulating firebrick or ceramic is the usual choice for high temperatures.
 
An aluminum furnace that has a heat-source that can overshoot is in danger of self-destructing/melting. It would be far more prudent to construct the walls with cast iron or sheet steel, and line the firebox with firebrick or ceramic, as marcusl suggests. Muffle-furnaces (high-temp boxes for lab-use) are not made out of aluminum for good reason. A properly lined iron or steel furnace will resist deformation and will last for many years.
 
The furnace I am making is for low temperature applications ...I am going to use it below 500 Degrees Celsius
 

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