Magnetic Materials for moderately high temperature use 2

[Scott Price]

I need to survey a list of materials capable of high (permanent) magnetization that will withstand modestly high temperature preparation for use (vacuum bake-out at roughly 120 C to 200 C, let's say, for a few hours).

Density of likely candidates I've seen so far run to 7.5 - 8 g/cc. This is fine.

For the moment, I can only use commercially available materials, fashioned into small ~ 6 - 12 mm diameter, 6 mm thick (cylindrical).

Neodymium compounds/alloys are appealing.

Any others?

Thanks

 

[MagMike]

Another option would be Samarium Cobalt, which can easily accommodate that temperature range. The density is 8.4 g/cc, a little higher than NdFeB.

 

[EdStainless]

If you can find a 2:17 SmCo magnet you would better off.
NdFe magnets don't really stand a chance.
Repeated cycles to 150C will cause noticeable degradation in magnetic properties.

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P.E. Metallurgy, consulting work welcomed

 

[Scott Price]

MagMike, EdStainless,
Both: thanks so much. The advice is running to Samarium Cobalt, at 8.4 g/cc, yes it's a little heavier per unit, but survival is key.
Best,
Scott