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Thank you Ed. I should've realized those heaters could be purchased way before posting. That's what I'll do.

Just to add, the power requirement will not be high. Something on the 5000W ballark which might not be trivial but I don't think would require any out-of-ordinary materials.

IRStuff, I mean the insulation. The heating element is easy enough to make out of copper or steel wire if necessary. If you could give me a name for that ceramic so I could look for it, that'd be great. Thanks for the replies so far I'll check them out.

Hello gentlemen, I'm trying to produce a heater element to be incorporated into a steel valve body to maintain fluid temperature in the 1000K ballpark. Obviously I can't simply pass a copper wire so I'd be very grateful if anyone could give me the commercial names for the materials commonly used...

Thanks TempMart for the tip but maraging steels are very hard to find in my area in large sizes and I wish to stick to readily available materials like 4340...

Gentlemen thanks again for the advice. I'm not planning on using vacuum because I don't want to store the energy for any amount of time. Charge it and use it when full, then charge it again. I figure I can build the flywheel with integrated motor and eletromagnetic clutch for less than half...

Thank you tbuelna I also thought it was too good to be true.

metengr, Yes, actually I'm desiging against yeld strength, I only copied ultimate strength as an example. My idea for containment would be encasing it in a 25mm (1 inch) thick steel cylinder, above ground, a single hole in one side for the axis connecting to an eddy current clutch for energy...

Hello, I'm designing a flywheel for storage of 7 MJ. Currently I'm achieving that spinning at 14500 rpm a 500mm diameter (20 inch) x 120mm (4.7 inch) 4340 cylinder. I'm assuming I can harden it to 2020 MPa (293000 ksi) ultimate strength according to this matweb datasheet...

For heat dissipation the whole setup will be immersed in water. I'll look into all ideas, thanks everyone.

Yes, the coating thickness is calculated as a function of the skin-effect for conduction of electrical current. If it is thicker, though, it could be machined down...

Brazing won't do because it needs to be done between close fitting fixed parts, and I need the aluminum to be a finish coat. Thanks though. I'm looking into hot dip aluminizing and it seems promising. Can't find a commercial provider of this service though. Thanks!

The coating is supposed to carry induced electrical currents better than the steel itself. Would be placed on a steel plate 20+mm thick. Due to large magnetic fields and large forces induced by magnetism this must be a mechanically strong coupling. Does anyone know of a process I could use? Thanks.