MEMBER ITEMS FOR SALE
Custom Knives | Other Knives | General Items
-------------------------------------------
New Posts | New PhotosAll Photos



Go Back   The Knife Network Forums : Knife Making Discussions > Custom Knife Discussion Boards > Tool Time

Tool Time Let's talk shop. Equipment, Tips & Tricks, Safety issues - Post it here.

Reply
 
Thread Tools Display Modes
  #1  
Old 03-13-2018, 06:54 AM
salzwedelknives's Avatar
salzwedelknives salzwedelknives is offline
Member
 
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!


__________________
Duane Salzwedel
https://www.facebook.com/Salzwedel-K...6180547389862/
Instagram: salzwedel_knives
South Africa
Reply With Quote
  #2  
Old 03-14-2018, 12:25 AM
jimmontg jimmontg is offline
Guru
 
Join Date: Jan 2016
Location: Now live in Las Cruces NM.
Posts: 1,102
I do not think putting cement directly on the coils will be helpful. A burnout looks like the probable conclusion.


__________________
Now it says Guru and it used to say Master. I think I like Master better, though skilled would be the best description
Reply With Quote
  #3  
Old 03-14-2018, 01:14 AM
salzwedelknives's Avatar
salzwedelknives salzwedelknives is offline
Member
 
Join Date: Mar 2017
Location: South Africa
Posts: 27
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.


__________________
Duane Salzwedel
https://www.facebook.com/Salzwedel-K...6180547389862/
Instagram: salzwedel_knives
South Africa
Reply With Quote
  #4  
Old 03-14-2018, 02:53 AM
epicfail48 epicfail48 is offline
Enthusiast
 
Join Date: Aug 2017
Location: Springfield Mo
Posts: 89
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.
Reply With Quote
  #5  
Old 03-14-2018, 05:12 AM
salzwedelknives's Avatar
salzwedelknives salzwedelknives is offline
Member
 
Join Date: Mar 2017
Location: South Africa
Posts: 27
That does answer my question. Thank you very much for the feedback. I won't be covering it.


__________________
Duane Salzwedel
https://www.facebook.com/Salzwedel-K...6180547389862/
Instagram: salzwedel_knives
South Africa
Reply With Quote
Reply

Tags
a, advice, ceramic, furnace, heat, heat treat, integral, made, make, material, question, repair


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Refractory Cement as anti-scaler David Eye Heat Treating and Metallurgy 21 02-22-2016 09:22 PM
Photoshop Elements 6 or 5 R. D. Finch Knife Photography Discussion 4 12-21-2007 09:34 PM
Bought photoshop elements 5 SVanderkolff Knife Photography Discussion 3 06-14-2007 10:11 PM
PS elements 3/Photoshop CS rhrocker Knife Photography Discussion 4 12-20-2004 01:33 PM
Alloys and trace elements Slicer The Newbies Arena 2 02-20-2002 09:10 PM


All times are GMT -5. The time now is 05:24 AM.




KNIFENETWORK.COM
Copyright © 2000
? CKK Industries, Inc. ? All Rights Reserved
Powered by ...

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
The Knife Network : All Rights Reserved