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Anyone tried the newer annealed mu metal yet? Any favorite mu metal projects?
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Is this a specific product?
Mu metal is a generic name. Mu metal can come in a variety of compositions, but always afaik mostly nickel.
So what is the "new" mu metal that you refer to?
Annealed.
IIRC, annealing has always been part of the production process to make mu metal. Without it, the material is not nearly as effective.
You're right. All mu metal undergoes annealing in a hydrogen atmosphere. The latest mu metal sub's use cobalt instead of nickel and then super cool it to cryo temps immediately so that the cobalt stays amorphous like glass. You find it listed as metglas in catalogs.Cobalt has always been more permeable than nickel. Danger is that it can saturate.
Edits: 01/14/15
Ah, a product name! Thank you so much for weighing in. Without looking, I would suspect that metglas is considerable more expensive than mu metal.
Not really LessEMF sells 1" wide ribbon for$2.50 per foot.
Maybe you can tell me, how is it annealed?
Hydrogen annealing is used for making mu metal. This process has been done for at least 50 years (maybe considerably longer), hence my inquiry as to the "newness" of annealed mu metal.
So, why all the drama? I trust you use mu metal yourself, no? By the way I kinda doubt they had cryo 50 years ago.
There's no drama, I was just wondering what was new.
I can't put my finger on it, but there's an article that came out of Honeywell about cryo treating transformers that I believe was from the 60's.
Dunno about that but I know for sure Honeywell was investigating cryoing integrated chips the late 1990s, quite a bit later than the date you provide. I know this because I was using the same cryo lab as Honeywell. Coincidence. Huh? Besides, just because Honeywell was involved in cryo early on doesn't mean that mu metal manufacturers were using cryo early on.
Edits: 01/15/15 01/15/15
I don't think any mu metal manufacturers were using cryo treatments early on, but rather mentioned that Honeywell had explored the effects of cryo treatment on transformers previously. (One might infer during the space race?)
Do you know where you can get some?
Dave
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