Use of graphite as a microwave energy absorber for heat transfer

[combustioneer]

I'm investigating building a melting cupola that is radiated by 2450MHz microwave to aproximately 2600F. I plan on using graphite for the cupola and I'm wondering what kind of absorption to reflection ratio I should expect to see and how will the graphite hold up to delivering energy to it in this manner. The radiation will be striking the surface at varying angles because the cupola tube is round and placed on the cental axis of a triangular chamber with the microvave radiation reflecting off of the triangular walls.

 

[biff44]

It is a pretty complicated problem. There is the antenna/horn that radiates the specimen. There is the chamber surrounds the whole thing and prevents microwave power from leaking out. There is the material the crucible is made of--you want its resistivity to be just right. Too conductive and it will reflect instead of heat up with microwaves. You might want to rotate the crucible, or do something to stir up the microwave fields, so that there is more even heating.

In short, you need some detailed analysis of the problem. Suggest you hire a consultant.

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