Refractory metal for furnace 1

[tabletop]

I am constructing a small oxy/acetylene fired vacuum furnace for 1Kg steel melts. I need a cylinder around the crucible which will be the wall of the vacuum chamber. The cylinder will be a diameter of about 3" by 4" tall and must be good for about 2000C/3600F. I can tune the burner so it is a reducing/carbonizing flame to avoid oxidization of the refractory metal.

What refractory metal would be best suited for this purpose?
Any leads on where to purchase these in small quantities would be helpful too. Thanks

 

[unclesyd]

A question/s, How can you fire directly into a vacuum furnace?

What pressure do you plan plan to operate at?

There is no one metal that can do what you state as requirements in the OP. There are a few that will work with some assistance. These materials depend on enhancing their physical properties to do the job. Extremely expensive and hard to maintain.
Vacuum furnaces that can achieve those kind of temperatures are normally some variation of a cold wall furnace. There are any number of cold wall designs and all have one thing in common, that is high cost.
Normally you would design a furnace of this type for either an oxidizing or a reducing atmosphere, not usually both.

 

[tabletop]

unclesyd,
Sorry my description was a bit confusing. Imagine a normal gas fired furnace, now inside I put a sealed, say tungsten vessel. Inside the vessel is a vacuum (28.5" Hg) and a crucible charged with steel. Flames heat the vessel from outside and in turn heat the crucible inside.

What would be the best metal to use and how long could I expect it to last?

 

[rustbuster]

Tabletop,

Talk to the people at Haynes International, thier 214 or 230 alloys may work for you.

 

[tabletop]

rustbuster,
Perfect. Just what I am after.
Thank You.

 

[tomwalz]

How about SiC and a putty seal. SiC crucibles are standard parts for metal casting.



Thomas J. Walz
Carbide Processors, Inc.

http://www.carbideprocessors.com

Good engineering starts with a Grainger Catalog.