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Effects of substrate thermal conditions on the swelling of thin intumescent coatings

机译：基质热条件对薄膨胀型涂层肿胀的影响

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摘要

The experimental study presented herein investigates the influence of the substrate thermal conditions on the behaviour of thin intumescent coatings. Steel plates coated with a commercially available solvent-based thin intumescent coating were exposed to a constant incident radiant heat flux of 50 kW/m(2) in accordance with the heat-transfer rate inducing system (H-TRIS) test method. The influence of different substrate thermal conditions was investigated using sample holders capable of controlling the thermal boundary conditions at the unexposed surface of tested steel plates and comparing them to coated timber samples. Experimental results evidence that the substrate thermal conditions govern the swelling of intumescent coatings, thus their effectiveness in protecting load-bearing structural elements. The substrate temperature controls the swelling of intumescent coatings because it defines the temperature experienced by the reacting virgin coating located close to the coating-substrate interface. The physical and thermal properties of the substrate control the capacity of the system to concentrate/dissipate heat in proximity of the coating-substrate interface. In this way, the substrate thermal conditions govern the temperature evolution of the reacting intumescent coating, consequently the swelling process. Accordingly, high swelling rates were recorded for highly insulating conditions (timber substrate), while low swelling rates for poorly insulating conditions (water-cooled heat sink).
机译：本文提出的实验研究研究了基材热条件对薄膨胀型涂层的行为的影响。根据传热速率诱导系统（H-TRIS）试验方法，将涂有市售溶剂基薄膨胀型涂层的钢板暴露于50kW / m（2）的恒定入射辐射热通量。使用能够控制经过测试的钢板的未曝光表面的热边界条件并将它们与涂覆的木材样品进行比较来研究不同衬底热条件的影响。实验结果证明基材热条件控制膨胀型涂层的肿胀，从而有效地保护承载结构元件。基板温度控制膨胀型涂层的膨胀，因为它限定了靠近涂层基板界面的反应原子涂层所经历的温度。基板的物理和热性能控制了系统的容量，以在涂覆衬底界面附近浓缩/散热。以这种方式，基板热条件控制反应膨胀型涂层的温度演化，从而使膨胀过程。因此，记录高膨胀率以用于高度绝缘条件（木材基板），而绝缘条件不佳的低膨胀率（水冷散热器）。

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