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Mu metal

174.236.193.5

Posted on June 6, 2014 at 06:04:11
Anyone tried the newer annealed mu metal yet? Any favorite mu metal projects?
Share, share!

 

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RE: Mu metal, posted on July 30, 2014 at 12:42:53
Crazy Dave
Audiophile

Posts: 14371
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Do you know where you can get some?

Dave

 

RE: Mu metal, posted on January 10, 2015 at 19:09:43
Caucasian Blackplate
Industry Professional

Posts: 8313
Location: Seattle
Joined: June 18, 2004
Is this a specific product?

 

RE: Mu metal, posted on January 13, 2015 at 16:36:13
Mu metal is a generic name. Mu metal can come in a variety of compositions, but always afaik mostly nickel.

 

RE: Mu metal, posted on January 13, 2015 at 17:51:30
Caucasian Blackplate
Industry Professional

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Location: Seattle
Joined: June 18, 2004
So what is the "new" mu metal that you refer to?

 

RE: Mu metal, posted on January 14, 2015 at 09:32:12
Annealed.

 

RE: Mu metal, posted on January 14, 2015 at 11:15:38
Caucasian Blackplate
Industry Professional

Posts: 8313
Location: Seattle
Joined: June 18, 2004
IIRC, annealing has always been part of the production process to make mu metal. Without it, the material is not nearly as effective.

 

RE: Mu metal, posted on January 14, 2015 at 15:14:59
Maybe you can tell me, how is it annealed?

 

RE: Mu metal, posted on January 14, 2015 at 15:25:47
Caucasian Blackplate
Industry Professional

Posts: 8313
Location: Seattle
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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.

 

RE: Mu metal, posted on January 14, 2015 at 15:57:01
unclestu
Dealer

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Joined: April 13, 2010
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.

 

RE: Mu metal, posted on January 14, 2015 at 16:00:24
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.

 

RE: Mu metal, posted on January 14, 2015 at 18:17:45
Caucasian Blackplate
Industry Professional

Posts: 8313
Location: Seattle
Joined: June 18, 2004
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.

 

RE: Mu metal, posted on January 14, 2015 at 18:19:20
Caucasian Blackplate
Industry Professional

Posts: 8313
Location: Seattle
Joined: June 18, 2004
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.

 

RE: Mu metal, posted on January 15, 2015 at 01:31:19
unclestu
Dealer

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Not really LessEMF sells 1" wide ribbon for$2.50 per foot.

 

RE: Mu metal, posted on January 15, 2015 at 03:34:38
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.

 

RE: Mu metal, posted on January 15, 2015 at 19:40:33
Caucasian Blackplate
Industry Professional

Posts: 8313
Location: Seattle
Joined: June 18, 2004
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?)

 

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