Mumetal Metalwork: Bending 0.004" Permalloy-80 for 6" Radius

[Ravaner]

Hello ! I'm going to use thin ( 0.004" ) sheet of Permalloy-80 to realize a magnetic shield ( against european 50 Hz mains ). I have to bend this sheet to give it a 6" radius curvature. I would like to know if this treatment will not dammage and annihilate the magnetic properties of this material.

 

[marcusl]

Bending a thin sheet so gently should not change the material's properties.

 

[dmriser]

I have used mumetal to make 2 enclosures one with a 14cm radius and one about 8. The material seems to be performing well

 

[Ravaner]

Very useful replies. many thanks.

 

[PJC01]

I can provide some insights on this matter. Mumetal, also known as Permalloy-80, is a highly permeable alloy that is commonly used in magnetic shielding applications. It is known for its ability to redirect magnetic fields, making it an ideal material for protecting against electromagnetic interference.

In terms of bending the 0.004" sheet of Permalloy-80 for a 6" radius curvature, it is important to consider the effect on its magnetic properties. Bending can cause changes in the microstructure of the material, which can potentially alter its magnetic properties. However, the extent of this change would depend on the specific composition and processing of the Permalloy-80 used.

To ensure minimal impact on the magnetic properties, it is recommended to use a gradual bending process and avoid sharp bends or folds. Additionally, annealing the material after bending can help restore its magnetic properties. It is also important to note that the thinner the sheet, the more susceptible it may be to changes in its magnetic properties.

In conclusion, while bending the 0.004" sheet of Permalloy-80 may have some impact on its magnetic properties, proper handling and annealing can help minimize this effect. It is always best to consult with the manufacturer or conduct thorough testing to determine the specific impact on the material's magnetic shielding capabilities.