With the miniaturization trend of electrical equipment, the demand for various types of miniature iron cores has become increasingly significant. In order to develop a powder core with higher energy efficiency, smaller size and lighter weight, the development of a new type of soft magnetic composite (SMC) has become a hot spot. SMC materials can not only effectively reduce high-frequency eddy current losses, but also combine the production advantages of powder metallurgy technology. In the next few years, it will be widely used in automobiles, aviation, household appliances and other fields.

   SMC iron cores processing steps:

1) Raw material selection

Using high compressible and high pure water atomize iron powder, sponge iron powder or iron-based compound powder (containing Si, Al, Ni, Co and other elements) as raw material.

2) Powder insulation coating and mixing process

Use inorganic or organic insulating materials to coat iron powder, add lubricants, binders, etc., to make the powders fully mixed.

3) Forming and pressing

Pour the mixed powder into a rigid mold for uniaxial compression. The compression pressure is generally 300~800 MPa.

4) Heat treatment

The temperature is generally controlled between 400~700℃.

5) Surface coating or painting

The products are painted on the surface of the iron core to prevent rust, enhance the insulation performance of the soft magnetic composite core, and improve stability.