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Yuhuan Jinhong Machinery Manufacturing Co., Ltd.
Sintered ferrite magnets
Sintered ferrite magnets
Sintered ferrite magnets
Sintered ferrite magnets
Sintered ferrite magnets
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Home Magnets Ferrite Magnets Sintered Ferrite Magnets
Ferrite Magnets
Ferrite Magnets
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Injection Molded Ferrite Megnets
Injection Molded Ferrite Magnets

Sintered Ferrite Magnets

Sintered ferrite magnets are divided into isotropic and anisotropic magnets according to the orientation of magnetic crystals. They are the most widely used magnets due to their low price and moderate magnetic properties.

Categories: Ferrite Magnets, Magnets
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  • Description
Description

Sintered Ferrite Magnets: An Overview

Sintered ferrite magnets is primarily composed of BaFe₁₂O₁₉ and SrFe₁₂O₁₉. Based on the orientation of their magnetic crystals, sintered ferrites can be classified into isotropic and anisotropic magnets. Due to their low cost and moderate magnetic properties, they are among the most widely used magnets.

Manufactured through the powder metallurgy process, their chemical composition is Ba/Sr 0.6 Fe₂O₃.


Sintered Ferrite Magnets Production and Properties

  • Annual Production: Over 300,000 tons.
  • Manufacturing Process: Using ceramic technology, which results in a hard yet brittle material.
  • Key Features:
    • Excellent temperature resistance.
    • Low cost, making them the most commonly used permanent magnets.
    • Chemical Composition: Ba/Sr 0.6 Fe₂O₃.

Physical Properties

  • Curie Temperature: 450°C
  • Maximum Operating Temperature: 250°C
  • Hardness: 480–580 Hv
  • Density: 4.8–4.9 g/cm³

Magnetic Performance

Sintered ferrite magnets are available in two types:

  • Isotropic Magnets: Lower magnetic performance. (e.g., Y10)
  • Anisotropic Magnets: Higher performance grades such as Y25, Y30, Y35, and Y30BH.

Performance Table for Sintered Permanent Ferrite Magnets:

Sintered Ferrite Magnets Grades

Grade Residual Induction (Br) Coercivity (HcB) Intrinsic Coercivity (HcJ) Max Energy Product (BH)max
mT KGauss KA/m KOe KA/m KOe KJ/m3 MGOe
Y8T 200~235 2.0~2.35 125-160 1.57-2.01 210-280 2.64-3.51 6.5-9.5 0.8-1.2
Y22H 310~360 3.10~3.60 220-250 2.76-3.14 280-320 3.51-4.02 20.0-24.0 2.5-3.0
Y25 360~400 3.60~4.00 135-170 1.70-2.14 140-200 1.76-2.51 22.5-28.0 2.8-3.5
Y26H-1 360~390 3.60~3.90 200-250 2.51-3.14 225-255 2.83-3.20 23.0-28.0 2.9-3.5
Y26H-2 360~380 3.60~3.80 263-288 3.30-3.62 318-350 3.99-4.40 24.0-28.0 3.0-3.5
Y27H 350~380 3.50~3.80 225-240 2.83-3.01 235-260 2.95-3.27 25.0-29.0 3.1-3.6
Y28 370~400 3.70~4.00 175-210 2.20-3.64 180-220 2.26-2.76 26.0-30.0 3.3-3.8
Y28H-1 380~400 3.80~4.00 240-260 3.01-3.27 250-280 3.14-3.52 27.0-30.0 3.4-3.8
Y28H-2 360~380 3.60~3.80 271-295 3.40-3.70 382-405 4.80-5.08 26.0-30.0 3.3-3.8
Y30H-1 380~400 3.80~4.00 230-275 2.89-3.46 235-290 2.95-3.64 27.0-32.5 3.4-4.1
Y30H-2 395~415 3.95~4.15 275-300 3.45-3.77 310-335 3.89-4.20 27.0-32.0 3.4-4.0
Y32 400~420 4.00~4.20 160-190 2.01-2.39 165-195 2.07-2.45 30.0-33.5 3.8-4.2
Y32H-1 400~420 4.00~4.20 190-230 2.39-2.89 230-250 2.89-3.14 31.5-35.0 3.9-4.4
Y32H-2 400~440 4.00~4.40 224-240 2.81-3.01 230-250 2.89-3.14 31.0-34.0 3.9-4.3
Y33 410~430 4.10~4.30 220-250 2.76-3.14 225-255 2.83-3.20 31.5-35.0 3.9-4.4
Y33H 410~430 4.10~4.30 250-270 3.14-3.39 250-275 3.14-3.45 31.5-35.0 3.9-4.4
Y34 420~440 4.20~4.40 200-230 2.51-2.89 205-235 2.57-2.95 32.5-36.0 4.1-4.4
Y35 430~450 4.30~4.50 215-239 2.70-3.00 217-241 2.73-3.03 33.1-38.2 4.1-4.8
Y36 430~450 4.30~4.50 247-271 3.10-3.40 250-274 3.14-3.44 35.1-38.3 4.4-4.8
Y38 440~460 4.40~4.60 285-305 3.58-3.83 294-310 3.69-3.89 36.6-40.6 4.6-5.1
Y40 440~460 4.40~4.60 330-354 4.15-4.45 340-360 4.27-4.52 37.6-41.8 4.7-5.2

Applications

Sintered ferrite magnets are widely used in various industries, including:

  1. Motors:
    • Permanent magnet synchronous motors (PMSMs).
    • Stepper motors.
    • DC motors.
  2. Electrical Devices:
    • Loudspeakers.
    • Power supplies.
  3. Automotive Industry:
    • Electric vehicles (EVs).
    • Hybrid electric vehicles (HEVs).
  4. Machinery:
    • Magnetic chucks.
    • Magnetic tools.

Precautions for Use

  1. Brittleness: Sintered ferrite magnets are fragile and prone to damage from impact, vibration, and friction.
  2. Avoid Overloading: Over-saturation, prolonged overcurrent, or exposure to high temperatures can degrade magnetic performance.
  3. Magnetic Decay: Magnetic properties may weaken over time; regular inspection and replacement are necessary.

Sintered Ferrite Magnets Conclusion

Sintered ferrite magnets are widely used magnetic materials with numerous advantages, including cost-effectiveness and temperature resistance. Proper manufacturing processes and usage precautions are essential to ensure their stability and longevity.

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