MuShield Magnetic Shielding
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magnetic permeability

MuShield heat treats parts & materials on-site

With every magnetic shield MuShield manufactures, the Company's goal is to attain the maximum shielding capacity or permeability for that part while maintaining its dimensional and structural integrity. MuShield meets these objectives by heat treating parts and material on-site.

Why is heat treatment necessary?

To View Image Larger - Click HereTypical manufacturing methods for magnetic shielding involve bending, forming, welding, cold working, and mechanical finishing. Bending and forming are mechanical operations which can work-harden and/or stress high permeability materials. Welding introduces oxygen to the material, and mechanical finishing and cold working can introduce carbon. Each of these factors contribute to the degradation of shielding performance of high permeability materials.

What is "permeability"?

To View Image Larger - Click HereImagine a sponge. Some sponges have big holes, some are more tightly structured, each absorbs liquid to the point of saturation. Magnetic shielding material reacts in much the same way. Depending upon its structure, magnetic shielding material absorbs magnetic interference to a point of saturation. As magnetic interference increases, so too should the permeability of the material.

How does heat treatment increase the permeability of shielding material?

To View Image Larger - Click HereWhen the shielding materials that MuShield uses are heated to 2100°F for 1-2 hours, the grain of the material grows, increasing the materials ability to absorb magnetic flux. In addition, the hydrogen atmosphere in the heat chamber produces a chemical reaction with the shielding material, removing impurities such as carbon and oxygen, thereby enhancing permeability.

Finally, rapid and controlled cooling of the part freezes the desired grain of the shield, yielding maximum permeability. MuShield engineers regulate the temperature and the time the parts are in the heat chamber with care as it is critical that the parts maintain their structural and dimensional integrity.

Does MuShield provide heat treatment services for parts other than its own?

Absolutely. MuShield has a large heat treating capacity and remains committed to investing in additional equipment to keep up with the demand for these services. Fast turn around of heat treated parts is critical to MuShield customers.