Meterials with high heat resistance

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The discussion centers on the relationship between specific heat capacity and melting point in materials, particularly in the context of creating a cooker that can withstand temperatures above 2000 degrees Celsius. It is noted that while specific heat capacity tends to increase with temperature, there are materials with low specific heat capacity that can still have high melting points. Tungsten is highlighted as a suitable option, along with hafnium carbide and yttrium-stabilized zirconia. Concerns are raised about using carbon due to its tendency to react with the atmosphere and disintegrate, especially in high-temperature applications. Carbon fibers are mentioned as viable in certain contexts, but they require cladding to prevent combustion. The conversation emphasizes the importance of material selection for high-temperature applications, with a focus on durability and resistance to atmospheric conditions.
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Is there necessarily a relation between the specific heat capacity of a material and its melting point? Can you have a material that has a low specific heat capacity but have a high melting point?

The reason I ask this is because I want to make a cooker of sorts, but don’t know what to make it out of.

Something that I can heat up, with a lowish specific heat capacity, that can resist melting below 2000 degrees celsius (approximately).

Thanks
 
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You'd expect the specific heat capacity to increase with temperature, since the molar heat capacity of metals is similar (~25 J/mol-K) and denser elements generally have a higher melting temperature.

Only a handful of elements are still solid at 2000°C. Tungsten seems to be a good choice.
 
What about carbon?
 
Try hafnium carbide or yttrium-stabilized zirconia.
 
Last edited:
thank you for your replys and suggestions!

Borek: I had considered carbon, but wouldn't it react with the atmsophere and desintigrate rather quickly?

Chemisttree and Mapes: would these compounds be easy enough to get hold of in a reasonable size?
 
turnip said:
I had considered carbon, but wouldn't it react with the atmsophere and desintigrate rather quickly?

Yes and no. Carbon fibers are used in many applications, including those high temp ones.
 
Borek said:
Yes and no. Carbon fibers are used in many applications, including those high temp ones.

Okay, thanks!
 
If you try to use carbon fiber it will catch on fire and burn up the first time you use it. Carbon is NOT used in atmospheric high temperature applications without cladding. The RCC (Reinforced Carbon-carbon Composite) used on the shuttle tiles is clad in silicon carbide for example to prevent burnup during reentry.

Yttrium-stabilized zircon can be found http://www.americanelements.com/ysz.html"
 
Last edited by a moderator:
chemisttree said:
Carbon is NOT used in atmospheric high temperature applications without cladding.

Just for the record: I have never meant bare carbon can be used.
 

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