Sealing a furnace

[lorellana]

I am in the design of an Argon atmosphere furnace and i need to know how can i do to seal the internal walls of the furnace to avoid the gas leak. Is it enough with the refractory cement? or should i try with another material?.
The max temp the furnace will reach is 1100 degrees celsius.

 

[unclesyd]

Comeback with more information.
Information like:

Is this an existing furnace?
Do you plan to use a muffle?
What is the size?
What is the end use?
What type insulation?
Anything else you can think of.

 

[lorellana]

This is not an existing furnace and that's my big problem, i have no model to take example and it's the first time i am in a project of this type.
My idea is an electrically heated furnace with the heating elements exposed to the inner atmosphere. The size is: 1.8m height, 2m wide, 2.5m deep, for a 9 cubic meter inner space.
The end use is to give a stress relief to titanium pieces after a welding process and to heat treat steel pieces of many shapes and sizes.
I want to use an insulation blanket of high purity alumina, silica and zirconia.
I will apreciate any help you could give me. By the way, if you know some website to get info about furnaces let me know.

 

[rorschach]

you might want to give this thread a look-see, some of the same issues are raised.

http://www.eng-tips.com/viewthread.cfm?qid=156587&page=1

 

[unclesyd]

I checked with my old boss about a on site built furnace in the size you are contemplating for heat treating Titanium. He and I agreed that this would be an almost insurmountable task for anyone other than a designer that is intimately familiar with the requirements for heat treating Ti. The conditions required are not just something you would desire but absolute requirements. A furnace for heat treating Ti is very complicated and extremely expensive.

I think your best bet would be to look on the surplus market for furnace and even then you are talking about large sums of money for a furnace of you dimensions.

This is one company that makes suitable furnaces for heat treating Ti.

Comeback if you have further questions.

http://www.elnik.com/heat.html

 

[arunmrao]

I agree with unclesyd and would not recommend trying it out for dimensions as large as you have mentioned. You can look in for some used furnaces too if you have the right budget. You may contact David Pye at Pyemet .

David Pye, Pye Metallurgical
E-mail Address(es):
davidpye@pyemet.com


He had sent me details of a few used vacuum furnaces sometime ago. Hope they are still available.

 

[EdStainless]

I have built a number of furnaces, and temperature uniformity is the killer. A steel box, good insulation, heating elements, those are the easy parts.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[lorellana]

Thanks to everybody, i'll take your advice and i'll comeback to tell you what happened.