We are building a 220 volt electric kiln. Salvaged a clothes dryer drum for the shell. Cut in half circumferential. The open, front half of the drum will be a lid. The closed, back half of the drum became the base. Ceramic fiber insulation was laid up with plaster to form the floor.

Hydrogen burns at 5,000 F, another reason to not use metal in the turbine construction. Carbon fiber has an upper limit of 5,000 F in the absence of oxygen, as a reinforcement fiber encapsulated by ceramic it offers three times the tensile strength of steel. Alumina oxide ceramic is good to around 3,000 F.  The lighter weight of these advanced materials also translates to more energy from the turbine rotor.

So my materials go beyond turbine alloys, however not all the way up to 5,000 F. It's ok, because my turbines utilize pulsed combustion. Cooling is integrated into the combustion cycle.