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Question:

What magnetic material is sintered with large corundum crucible?

What magnetic material is sintered with large corundum crucible?

Answer:

But the chemical stability is good, not in vacuum. Corundum, by contrast, is much cheaper.
Corundum temperature limited, easily cracked at high temperature.
The graphite crucible is a high temperature resistant and difficult to sinter material, but the biggest problem must be used in a vacuum or a reducing atmosphere. Otherwise, graphite is easily oxidized at high temperature. And the crucibles are more expensive.

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