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Old 03-13-2018, 06:54 AM
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salzwedelknives salzwedelknives is offline
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Join Date: Mar 2017
Location: South Africa
Posts: 27
Refractory cement over elements

Hi there,

Looking for some advice with regards to an electric heat treat oven.

I am currently rebuilding an tubular electric heat treat oven. The original one had an inner ceramic tube (8mm) with the element wrapped around it and then a couple of wraps of kale wool. What I am using is ceramic fibre board as my insulation material with thermal conductivity of 0.15W/mK.

When I took the old furnace apart the old ceramic tube came out in pieces, so what I would like to know is, instead of getting another ceramic tube made and after putting the element into grooves made into the fibre board, can I cover the element with refractory cement with a thermal conductivity of 1.2W/mK? So I basically want to make a integral inner tube.

The reason I am asking is after reading the Kanthal Handbook talking about furnace wall load, I am worried that after covering them with mortar, the element may overheat during usage.

Any advice will be greatly appreciated!


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