Magnetic Properties of Sintered Ferrite Magnets

Sintered ferrite magnets, also known as ceramic magnets, are widely used in various applications due to their favorable magnetic properties and cost-effectiveness. Stanford Magnets provides detailed specifications for different grades of sintered ferrite magnets, adhering to standards from China, the United States, and Europe.

Key Magnetic Parameters

The primary magnetic properties of sintered ferrite magnets include:

• Remanence (Br): This indicates the residual magnetic flux density remaining in the magnet after an external magnetic field is removed.
• Coercivity (Hcb and Hcj): Hcb (coercive force) is the intensity of the applied magnetic field required to reduce the magnetization of the material to zero. Hcj (intrinsic coercivity) measures the resistance of the magnet to demagnetization.
• Maximum Energy Product ((BH)max): This represents the maximum energy density the magnet can store, indicating the strength of the magnet.

Further reading: What Is a Ferrite?

Chinese Standard Grades

Under the Chinese standards, sintered ferrite magnets are categorized into various grades, each with specific magnetic properties. For instance, grade Y30 has a remanence (Br) of 370–400 mT, coercivity (Hcb) of 175–210 kA/m, intrinsic coercivity (Hcj) of 180–220 kA/m, and a maximum energy product ((BH)max) of 26.0–30.0 kJ/m³. These properties make Y30 suitable for general-purpose applications.

Higher grades like Y35 and Y40 offer improved magnetic performance, with Y35 having a Br of 430–450 mT and (BH)max of 33.1–33.2 kJ/m³, and Y40 exhibiting a Br of 450–460 mT and (BH)max of 37.6–41.8 kJ/m³. These grades are ideal for applications requiring stronger magnetic fields.

International Standards

Stanford Magnets also provides equivalent grades under American and European standards. For example, the American grade C8 corresponds to a Br of 385 mT, Hcb of 235 kA/m, Hcj of 242 kA/m, and (BH)max of 27.8 kJ/m³. European grades like HF26/26 offer a Br of 370–380 mT, Hcb of 230–240 kA/m, Hcj of 260–270 kA/m, and (BH)max of 26.0–27.0 kJ/m³.

Applications of Sintered Ferrite Magnets

Sintered ferrite magnets are commonly used in:

• Electric Motors: Due to their high coercivity and moderate energy product, they are suitable for various motor applications.
• Loudspeakers: Their stable magnetic properties make them ideal for audio equipment.
• Magnetic Separation Equipment: Used in separating ferrous materials from other substances.
• Household Appliances: Employed in various devices due to their cost-effectiveness and reliability.

Further reading: Top 10 Uses of Sintered Ferrite Magnets

Conclusion

Stanford Magnets offers comprehensive data on sintered ferrite magnets, providing valuable insights for engineers and designers in selecting the appropriate magnet grade for their specific applications. Understanding the magnetic properties and standards is crucial for optimizing performance and ensuring compatibility with various devices and systems.

Summary Table: Magnetic Properties of Sintered Ferrite Magnets

For more data and the pdf version, please click here. We offer the Chinese Standard, the American Standard, and the European Standard.

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