Are there any substances that can survive temperatures equal to 5700K at Standard Pressure without melting or burning?

Are there any substances that can survive temperatures equal to 5700K at Standard Pressure without melting or burning?



Hey, I am trying to build a superhero for a Superhero Universe I plan on using for an RPG. His power is essentially that he can burn his hands up to temperatures equal to that of the center of the earth (5700k) and was wondering how one would be able to contain such high temperatures safely, such as in a specialized prison cell. I would like to see if such a substance that can act as hi cell is known to exist already before I resort to creating some sort of fictional (probably carbon-based) miracle material that can do it, and if I do need to make such material would like to see what real world materials come close enough to base it off of.





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