How to Make Better Ferrite Powder for Industrial Use

A specific recipe for creating highly spherical magnetic ferrite particles that mix easily into plastics without ruining the curing process.

What it covers

This patent describes a specific chemical composition and manufacturing process for ferrite powder, which is a magnetic material often used as a filler in resins or plastics. By controlling the iron and manganese content, as well as keeping the carbon levels very low, the inventors ensure the powder remains highly magnetic while allowing the resin to harden properly. The process involves thermally spraying a mixture that includes a specific lubricant, resulting in particles that are nearly perfect spheres, measured by a shape factor (SF-1) of 100 to 110. This spherical shape is critical because it allows for a higher 'filling ratio,' meaning you can pack more magnetic material into a plastic component without making it too thick or difficult to work with.

What it doesn't cover

• —Does not cover ferrite powders with a carbon content higher than 0.100 mass percent.
• —Does not cover non-spherical or irregularly shaped ferrite particles outside the SF-1 range of 100-110.
• —Does not cover manufacturing processes that skip the thermal spray step.
• —Does not cover ferrite compositions containing manganese levels outside the 3.5 to 10 mass percent range.

The clever bit

The innovation lies in the specific inclusion of a carbon-hydrogen-oxygen lubricant during the thermal spray process, which balances the need for spherical particle formation with the requirement for extremely low residual carbon in the final product.

Why it matters

Ferrite powders are essential for creating magnetic plastics used in electronics, such as electromagnetic interference shielding or specialized sensors. If the powder inhibits the resin from curing, the final product will be brittle or structurally weak. This patent provides a precise technical standard for manufacturers to achieve high magnetic performance without compromising the physical integrity of the host material.

Real-world examples

• 1.Magnetic resin composites for electronic shielding
• 2.High-density magnetic filler for industrial plastics
• 3.Specialized components for electromagnetic interference (EMI) suppression