Mold Material/Coating 1

[MatEngTED]

Need mold material or coating to:
1. Survive reaction temperature of 4500F, which produces superheated liquid (Tm=1980F)
2. Act as permanent release agent
3. Withstand 50-1000+ cycles

Thanks.

 

[EdStainless]

Is the environment oxidizing? reducing?
What is the substrate and how is it cooled? (what wall temp are you expecting)
Sounds like rocket technology to me.


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Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[MatEngTED]

The mold is used in an exothermic weld application to connect cables.

 

[unclesyd]

Is it a Thermite process?

 

[unclesyd]

If this is like the CadWeld System you can use Graphite.

 

[MatEngTED]

It is an aluminothermic reaction.

 

[EdStainless]

In most aluminothermic reactions the reaction takes place in a crucible with repalceable refractory liners and the molds are one-shot.
If the metal amounts are small and the reation times short I would expect graphite coatings to work.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[MatEngTED]

Would the graphite provide the 50 to 100+ cycle life?

 

[unclesyd]

The Cadwell Graphite Molds last for number of cycles with the cover having to be replaced before the body. I have seen at least 10-12 welds with the same mold use for building gounding connections to the grounding grid.

Also there are coatings that will help extend the graphite molds since the exposure is short, but they are expensive.

http://www.erico.com/products.asp?folderid=41

 

[arunmrao]

As a normal practice fire clay molds are used. This technology is also used by some to manufacture ferro alloys and also high manganese steel castings. If you desire you can use graphite or CI molds for the purpose.
Fireclay molds offer the benefit of easy molding slag removal and knockout after the casting.