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The Chemistry Behind Refractory Coatings
The Chemistry Behind Refractory Coatings
June 22, 2017

During the process of refractory coatings, there are properties that need to be thoroughly assessed before applying them onto a specific structure. The following control points need to be considered in order to determine the proper refractory coatings that should be used.


  • Melting Point. An object experiences physical or chemical changes when it is exposed to specific temperatures. When the melting point of refractory coatings are known, one can easily determine the amount of thermal stress an object can withstand.


  •  Stability. This refers to the size and dimensional stability of the refractory coatings. Since it is an application, the stability refers to its ability to repel chemical change


  • Porosity. This is the process where refractory coatings allow heat to pass through the materials. The porosity allows the refractory coatings to maintain their structure. Low porosity levels imply an inability to repel heat and thermal stress.


  • Bulk Density.  This quality concerns itself with the amount of refractory coatings used to maintain its volume stability, heat capacity, and ability to repel heated materials. The number of coatings help determine and assess its bulk density.


  • Pyrometric Cone Equivalent. Refractory coatings possess different melting points and they are measured by their pyrometric cone equivalent. This is important for quality control because the variable melting points for each refractory coating effects their functionality.

As a result, the components mentioned above are important for the functionality of refractory coatings. 

The chemistry of refractory coatings is more complex than its application on a given surface. The melting point, stability, and porosity provide a picture of an operating refractory coating under pressure points. The bulk density and the pyrometric cone equivalent determines the volume and highest thermal temperature the coatings can withstand. Without this information, the refractory coating’s functionality 

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