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Monday, 16 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Protecting structural steel against heat

Friday, 16 August 2013

Some test are really tough. For example furnace tests for steel. But researchers from the University of Leeds offer three strategies for a thermal protection.

Thermal protection of steel against furnace heat

Source: Karelin Dimitry/Fotolia

Thermal protection of steel against furnace heat

Source: Karelin Dimitry/Fotolia

 
Typically in furnace test conditions and real fire environments steel is exposed to both radiative and convective heating. This means that thermal protection strategies based on surface properties alone will be ineffective.

There are two obvious strategies to minimise heat transfer to the steel: minimise the thermal conduction coefficient (the ratio of thermal conductivity to coating thickness) or to maximise the heat sink potential.

Three strategies for thermal protection

Dr John E.J. Staggs, University of Leeds, United Kingdom gives in his talk at the European Coatings Conference "Protective coatings" an overview of three strategies for thermal protection:

  • a reactive constant volume coating (heat sink),
  • a sacrificial variable volume coating (ablative)
  • and a reactive variable volume coating (intumescent).

Important parameters for each class of coating are identified and discussed in relation to fire test and other experimental data.

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