Soft Magnetic Materials

The processing of soft magnetic materials is another area of expertise for MPP.

The most common soft magnetic P/M materials used by MPP are pure Fe, Fe-0.45% P, Fe-3% Si, and Fe-50% Ni. In addition, 410L and 434L plus similar grades of stainless are also good candidates for soft magnetic applications where corrosion resistance is needed. Examples of these are anti-lock brake systems (ABS) such as “sensor” or “tone” wheels. These are often located at the vehicle wheels and are exposed to water, dirt, and salt from the road. Other soft magnetic materials covered by a protective coating compete in these types of applications.

Higher temperatures during sintering and the use of pure hydrogen for oxide reduction will improve soft magnetic performance. The absence of nitrogen eliminates the deleterious effects of the element, while the higher diffusion rates increase density, dissolve precipitates, and promote recrystallization and grain growth, In the case of silicon steel and phosphorus steel, the increased densification occurs with the aid of transient liquid phases.

For more information on P/M soft magnetics, go to Tech Insider.

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