General Introduction

Ferrites are usually non-conductive ferromagnetic ceramic compounds derived from iron oxides such as hematite (Fe2O3) or magnetite (Fe3O4) as well as oxides of other metals. In terms of the magnetic properties, the different ferrites are often classified as "soft" or "hard", which refers to their low or high magnetic coercivity.

Features

Soft Ferrite has low coercivity, which means the material's magnetization can easily reverse direction without dissipating much energy (hysteresis losses), while the material's high resistivity prevents eddy currents in the core, another source of energy loss. Permanent ferrite magnets are made of Hard Ferrites, which have a higher coercivity and remanence after magnetization than soft Ferrite.
Ferrites are, like most other ceramics, hard and brittle.

Typical Grades

Hard Ferrite: Y20-Y40

Property

Some important properties used to compare permanent magnets are:

• Remanence (Br), measure the strength of the magnetic field;
• Coercivity (Hcb / Hcj), the material's resistance to becoming demagnetized;
• Energy product (BHmax), the density of magnetic energy, which relates to the magnetic flux output per unit volume. Higher values indicate stronger magnets;

You could check the Property Table in the below linkage for reference:

• Hard Ferrite: Property Table

Shape

Ferrite magnets could be made into various shapes:

• Disk/Cylinder, Bar/Block, Ring, Arc, etc.

Custom design is available to us for client`s specific needs

Application

Some examples of Soft Ferrite applications:

• Electronic Inductors
• RF Transformers

Some examples of Hard Ferrite applications:

• Microphones
• Loudspeakers
• Electro-acoustic Instrument Pickups
• Magnetic Separator

Production

Ferrite:

Raw Materials → Pre-Sintering → Milling → Granulation → Dry/Wet Press in Magnetic Field → Sintering → Machining → Magnetization → General Inspecting → Packing & Delivery