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looking for cunife 60% cu 20% ni 20% fe

treedroppings (Electrical)
11 Feb 09 4:20
  are supplies of cunife stock for machining available anywhere?  I've already tried google but no luck.

Thanks in advance
hacksaw (Mechanical)
11 Feb 09 14:07
Try searching under Permeable Alloys, you'll have a lot of choices
MagMike (Materials)
11 Feb 09 16:44
Hacksaw: A Google search for Permeable alloys brings up mostly technical papers.  I don't see many choices there.

I've been looking for a supplier for Cunife for a while too.  Can you recommend a supplier?
MagMike (Materials)
12 Feb 09 9:20
Hacksaw:  Thank you for the links, but they are for mumetal shielding, or the like.  Cunife is not suitable for magnetic shielding, it is a (weak) permanent magnet with high ductility.  It does not have high permeability.

Any other ideas?
hacksaw (Mechanical)
12 Feb 09 17:33
You're right about the hardness of the 30-60% Cu alloys.

Your best bet is to contact Arnold and have them do the leg work, they have alternatives to CuNiFe and CuNiFe but the thicknesses is the issue
treedroppings (Electrical)
12 Feb 09 23:53
the 60-20-20 cunife is for an audio application,  thanks anyways  
hacksaw (Mechanical)
13 Feb 09 10:27
solutions exist but not for casual interests. Things are better now. The last time I needed ferro-alloys alloys in bulk form it was a 10,000 lb minimum



http://www.alloys.com/custom-and-specialty-alloys/index.aspx
MagMike (Materials)
13 Feb 09 10:48
Hacksaw:  That look like a good company, but it appears that they just provide bulk metal, to a specific composition.

Getting Cunife is not a matter of just ordering a specific composition alloy.  Cunife needs to also be heat treated and drawn down to achieve proper magnetic properties.

You are right that this is not something for casual interests.  The inquiries I get are generally for small quantities in designs that have been in use for decades.  When I can, I switch them to some other material, but it is not easy.  That's why I was hoping you knew of someone that still makes the material (after heat treating & drawing)  It appears that the market for Cunife is too small to support whatever applications remain.

Thanks anyway.
hacksaw (Mechanical)
13 Feb 09 13:12
Fully cognizant of difficulty of getting finished forms, material tests, purities, BH testing, etc. We had access to a fully decked out research lab for support. Custom materials were never easy but figuratively not impossible.

Sounds like an opportunity to create a new design.
hacksaw (Mechanical)
16 Feb 09 15:16


thare are alternative alloys that cover the CuNiFe class of materials in terms of ductility and magnetic hardness. You might consider them in rod form.
MagMike (Materials)
16 Feb 09 15:38
Please specify which alloys you had in mind.  

Sources for them would be helpful too.

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