National Physical Laboratory

Answers in a Flash

NPL has used Laser Flash Apparatus (LFA) to test the thermal diffusivity of an oxidation resistant coating from Diffusion Alloys. This oxidation resistant coating has now been shown to have no material effect on the heat transfer characteristics of furnace tube walls, and armed with this data an order for this coating has been won by Diffusion Alloys.

A furnace vendor was concerned that a customer's wish to have Diffusion Alloys apply an oxidation resistant coating on tubular metallic components within one of its furnaces would affect the heat transfer characteristics of the tube wall. To give reassurance to the vendor, Diffusion Alloys asked NPL to collect thermal conductivity data on both uncoated and coated tube material.

The LFA at NPL uses a high intensity laser pulse to heat the bottom face of the sample coating and records the temperature rise on the top face using an InSB infra red detector. The customer asked that the thermal conductivity data be collected between 500 °C and 1000 °C. Within this temperature range, in both new and used conditions, the oxidation resistant coating was shown to have no material effect on thermal diffusivity, satisfying the company purchasing the furnace and the furnace vendor that this coating would be suitable.

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Last Updated: 22 Feb 2017
Created: 1 Feb 2011

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