Sintered ferrite has the following characteristics:

 Magnetic properties:

1. Moderate magnetic strength: It has relatively stable magnetic properties, which can meet the requirements of many common applications. However, compared with some high-performance rare earth magnets, its magnetic strength is not extremely high. For example, in some medium and low requirements for magnetic field strength in motors and speakers, sintered ferrite can play a good role12.

2. High coercivity: Sintered ferrite has a relatively large coercive force, which means it is not easy to be demagnetized after magnetization, and has strong resistance to demagnetization. This characteristic makes it suitable for working in environments with complex magnetic fields or where the magnetic field is likely to change34.

3. Anisotropy in some cases: According to the orientation of magnetic crystals, it can be divided into isotropic and anisotropic magnets. Anisotropic sintered ferrite magnets have stronger magnetic properties in a specific direction, while isotropic ones have relatively uniform magnetic properties in different directions5.

Physical properties:

1. Hard and brittle: It is a hard material with a certain degree of brittleness. It can be cut and processed using abrasive tools, but it is prone to break or crack during processing and use, so special attention needs to be paid during handling and installation346.

2. High density: The density of sintered ferrite is relatively high, generally between 4.8-4.9 g/cm³, which is beneficial to ensure its stability and mechanical strength in some applications12.

Thermal properties:

1. Good temperature stability: It has a relatively high Curie temperature and a certain maximum operating temperature. The Curie temperature is around 450 °C, and the maximum operating temperature can reach about 250 °C, which enables it to maintain relatively stable magnetic properties in a high-temperature environment to a certain extent12.

2. Poor temperature coefficient: The temperature coefficient of some magnetic parameters of sintered ferrite is not excellent, that is, the magnetic properties will change with the temperature change to a certain extent. For example, the remanence (Br) temperature coefficient is about -0.2%/°C, which means that the remanence will decrease by 0.2% when the temperature rises by 1 °C6.

Chemical properties:

1. Good corrosion resistance: Since its main raw materials are oxides, it is not easy to be corroded in general environments and does not require special plating or other anti-corrosion treatments, which gives it good chemical stability.

Cost-effective: The raw materials for sintered ferrite are abundant and the manufacturing process is relatively simple, so its cost is relatively low, making it one of the most widely used magnetic materials in various fields124.