I want to anneal my bulk sample at around 1000 oC with magnetic field of 2 T. I want to make a furnace which can achieve my requirement. How can I design a furnace so that magnetic poles of electromagnet will be protected from heat?
The poles of your electromagnet should be shielded with water-cooled copper plates placed next to the poles' ends. The plates may be relatively thin, but water cooling is essential. Perhaps, to be on the safe side, the plates should have channel(s) with running water across the magnetic flux. What's important, copper is diamagnetic and does not interfere with static magnetic field; similarly water does not change the distribution of magnetic field. The rest is your imagination.
Attached, you can find out about the effects on heating magnetic material. More information about shielding is here.
http://www.magnetic-shield.com/faqs-all-about-shielding.html
Heat annealing in a hydrogen atmosphere is a process completed after fabricating a shield with for example mumetal sheet. This is generally required to increase grain structure, improving shielding efficiency. Optimum magnetic properties are obtained by annealing at a temperature of 1950-2050°F [about 1120°C], and cooling at a consistent rate which is critical to maintaining grain structure and part dimensions. After the shield is fully annealed, high attenuation properties to absorb low field magnetic energy is maintained. A flat shield typically can be used without annealing.
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