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high thermal conductivity alloy

high thermal conductivity alloy

(OP)
Hi there,
I'm looking for an alloy whose thermal conductivity should be over 50W/mK at 650degC. The higher the better. The material takes some force at 650degC therefore requires strength. I don't want to use copper or its alloy because they don't resist to aluminum corrosion in my application. Any advice is welcome.
Many thanks.

RE: high thermal conductivity alloy

Are you in an oxygen free environment? You might consider a Mo alloy such as TZM.
I am not sure of the numbers but BeNi might also be an option.

Though my first choice would be a direct sintered (not reaction bonded) SiC. You will have to be careful about thermal shock but it has good heat transfer, high strength, and good high temp resistance.

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P.E. Metallurgy, Plymouth Tube

RE: high thermal conductivity alloy

(OP)
Unfortunately it is not oxygen free.
We actually tried SiC. The material is very fragile and can be broken easily. Because of its high hardness, it was almost impossible to do precision machining.

RE: high thermal conductivity alloy

(OP)
Ok, let me try.
Geometry: Block 250 X 120 X 50mm, some precise ø13 holes on it, and some other features can be relatively easily machined.
Operation temp: 650°C
Thermal conductivity: >50W/mK
Strength: let's say comparable to AISI 316.
Environment: open to air but makes contact to aluminum billets during operation.

RE: high thermal conductivity alloy

(OP)
I'm trying to transfer heat through this block to aluminum billet as fast as possible. The end goal is to heat billet up to 500°C. This block would be a key component on my heating machine.

RE: high thermal conductivity alloy

Are you kidding me, SiC fragile?
Look at BeNi then, and good luck.

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P.E. Metallurgy, Plymouth Tube

RE: high thermal conductivity alloy

Oh, OK, that's quaint. How tall are these billets relative to their contact areas?

I'm thinking this is almost a nonstarter. A tall billet will almost ensure that the bottom will melt before the top even reaches your goal temperature. Are you actually trying to melt the billets in place? Your stated goal temperature is only about 10C below the melting point of aluminum.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
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RE: high thermal conductivity alloy

Perhaps some more details would be more enlightening and make it more likely that you get a decent answer.

RE: high thermal conductivity alloy

How about copper with a suitable plating?

RE: high thermal conductivity alloy

You said that the part was sandwiched and loaded, not being impacted.
I have made a lot of parts out of SiC and other ceramics, as long as you don't over-do the impact or thermal shock they are nearly indestructible.

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P.E. Metallurgy, Plymouth Tube

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