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Old 03-13-2018, 06:54 AM
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salzwedelknives salzwedelknives is offline
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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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Old 03-14-2018, 12:25 AM
jimmontg jimmontg is offline
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I do not think putting cement directly on the coils will be helpful. A burnout looks like the probable conclusion.


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Old 03-14-2018, 01:14 AM
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salzwedelknives salzwedelknives is offline
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That was what I was worried about. I think the safest option will be to either repair the original ceramic tube or get a new one made.


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Old 03-14-2018, 02:53 AM
epicfail48 epicfail48 is offline
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Itll overheat. Elements arent meant to be enclosed like that, theyll overheat for sure. There are adhesives like Pyrolite that are made for securing elements to kiln ceilings, but even those arent meant to be used to cover the element.
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Old 03-14-2018, 05:12 AM
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salzwedelknives salzwedelknives is offline
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That does answer my question. Thank you very much for the feedback. I won't be covering it.


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Old 03-25-2021, 10:41 AM
SarahMann055 SarahMann055 is offline
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I agree that the safest option will be to either repair the original ceramic tube or get a new one made. Tell me more about what happened to your stove so I can help you. Also, you can look here for a specialist who can help you to fix it. My friend recently became an electrical inspector, and from his words, I realized that the range of their work is large. And undoubtedly it became much more interesting for him to work than like an ordinary electrician. And if you decide to fix it by yourself, firstly consult at least with a specialist or watch training videos on Youtube. Be careful not to get hurt and break something. Good luck!

Last edited by SarahMann055; 03-29-2021 at 01:58 AM.
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