Casting Rhodium

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Jshapco2

Jshapco2

New member
Joined
Aug 8, 2023
Messages
3
Location
Los Angeles, CA
Hello All,

I am looking for a reference ( if it exists) of someone who can cast Rhodium, or make plate so it can be machined. Also looking for a reference of someone that casts Gold alloys with a HIP process.

Thank so much,
Josh
 
Jshapco2 said:
Hello All,

I am looking for a reference ( if it exists) of someone who can cast Rhodium, or make plate so it can be machined. Also looking for a reference of someone that casts Gold alloys with a HIP process.

Thank so much,
Josh
Click to expand...
Welcome to us😊
Casting Rhodium is exceedingly difficult due to the high temperature needed.
Why cast and machine?
Do the product have stringent dimension criterias?

I believe most parts of Rhodium is sintered.
What is a HIP process?
 
Depending on the final parts dimensions it may be possible go electroform the part/object. Never done such with any metal, and not sure if it's even possible to do with Rh, but it may be a possible solution.

Steve
 
Is it essential that the whole part is Rhodium?
How about plating the part with thick plating?
 
Thank you all for the responses. Yes, need to make a solid part out of rhodium with no porosity around 2" or 50mm in diameter 5mm thick.
 
Jshapco2 said:
Thank you all for the responses. Yes, need to make a solid part out of rhodium with no porosity around 2" or 50mm in diameter 5mm thick.
Click to expand...
If you are going to use lost vax or similar casting, you will need an induction furnace and the correct investment.
Ransom and Randolph has some good investments designed for Platinum but it has an upper temperature use of 2200C
This will just make it possible to use for Rh, which will need at least 2100C to be poured well.
With large sprues and proper reservoirs it will maybe be possible to avoid porosities from shrinking and boiling.
 
Yggdrasil said:
If you are going to use lost vax or similar casting, you will need an induction furnace and the correct investment.
Ransom and Randolph has some good investments designed for Platinum but it has an upper temperature use of 2200C
This will just make it possible to use for Rh, which will need at least 2100C to be poured well.
With large sprues and proper reservoirs it will maybe be possible to avoid porosities from shrinking and boiling.
Click to expand...
Insulated molds helps with that. Engineers job...
 
Would melting in a graphite mould used for pouring bullion, say a 5 T oz Au., in an induction furnace work? You would have to use a furnace which would allow for the outer dimension size of the mould, shim up to coil area, heat, let cool in place with a cover possibly, retrieve when cooled.
 
Yggdrasil said:
If you are going to use lost vax or similar casting, you will need an induction furnace and the correct investment.
Ransom and Randolph has some good investments designed for Platinum but it has an upper temperature use of 2200C.
Click to expand...
I think you will need a Vacuumbe Induction setup and remotely activated tilt to manage a product with a high level of production.
This would eliminate the insulation issues and gas solubility in molten Rhodium.
 
justinhcase said:
I think you will need a Vacuumbe Induction setup and remotely activated tilt to manage a product with a high level of production.
This would eliminate the insulation issues and gas solubility in molten Rhodium.
Click to expand...
My reply to the OP was of course very simplified😏
 
Just curious why you would need to pour, if you can get it up to temperature, then let it cool in the furnace in the shape required? Perhaps with the necessary gas injected for the proper environment. Also curious of the end use of casting.
 
goldshark said:
Just curious why you would need to pour, if you can get it up to temperature, then let it cool in the furnace in the shape required? Perhaps with the necessary gas injected for the proper environment. Also curious of the end use of casting.
Click to expand...
in-mold casting will only work really well with bars or fairly simple designs with no gating systems.
Anything more complicated would need the appropriate gating setup to take contraction into consideration and other problems associated with in-mold melting.
 
justinhcase said:
in-mold casting will only work really well with bars or fairly simple designs with no gating systems.
Anything more complicated would need the appropriate gating setup to take contraction into consideration and other problems associated with in-mold melting.
Click to expand...
That is true, but this form is simple.
The issue might be to get hold of properly shaped crucibles in a material that will not melt or disintegrate into the metal in the temperature needed.
ZrO or BN crucibles might be needed.
 
Yggdrasil said:
That is true, but this form is simple.
The issue might be to get hold of properly shaped crucibles in a material that will not melt or disintegrate into the metal in the temperature needed.
ZrO or BN crucibles might be needed.
Click to expand...
Yes, I have only ever read about in-mold casting using C.N.C. carved graphite.
Not sure what material would be suitable for metals that can produce Plata organic compounds.
Another reason why conventional casting would be a better option is then each job will be undertaken with the material most suited for the task.
Melting or forming a mold instead of trying to find a material that is stable enough to act as a crucible and formable enough to make a mold with details.
 

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