Ferrite Ceramic Block Magnetic Blocking Material

  • Model NO.: Ferrite Ceramic Block Magnetic Blocking Material
  • Type: Permanent
  • Application: Speaker Magnet, Industrial Magnet, Jewelry Magnet, Solenoid, Motor Magnet, Craft
  • Coating: No
  • Grade: Y25 Y30 Y30bh Y35, etc.
  • Density (D): 4.8 - 4.9 g/cm3
  • Composite: 35% Strontium 20% Barium Ferrit
  • Color: All Black
  • Applications: Ceramic Block with Magnets for Mini Stepper Motor
  • Transport Package: as Customer′s Request
  • Origin: Xiamen, Ningbo
  • Certification: UL, RoHS, CE, ISO9001
  • Magnetocrystalline Anisotropy: Anisotropic Magnet
  • Shape: Ring
  • Product Name: Ferrite Ceramic Block Magnetic Blocking Material
  • Resistivity (P): 10 Ohm.Cm
  • Expansion Coefficients (R): -8 10-6 /Degree Celsius
  • Types: Isotropic Ferrite Magnets
  • Certificate: Ce, SGS, RoHS
  • Trademark: GME
  • Specification: D134xD57x12mm
  • HS Code: 85051900
Ferrite Ceramic Block Magnetic Blocking Material
General Information
 
Ceramic magnets (Ferrite magnets) are sintered permanent magnets composed of Barium or Strontium Ferrite.
This class of magnets, aside from good resistance to demagnetization, has the popular advantage of low cost.
Ferrite magnets are very hard and brittle, and require specialized machining techniques. Moreover, they should be machined in an unmagnetized state.
We are equipped to machine these materials to specifications.
Anisotropic grades are oriented in the manufacturing direction, and must be magnetized in the direction of orientation.
Isotropic grades are not oriented and can be magnetized in any direction, although some degree of greater magnetic strength will be found in the pressing dimension, usually the shortest dimension.
Due to their low cost, Ferrite magnets enjoy a very wide range of applications, from motors and loudspeakers to toys and crafts, and are the most widely used permanent magnets today.
 

Manufacturing
 
Pressing and sintering involves pressing very fine ferrite powder in a die, and then sintering this pressed magnet. All fully dense Ferrite magnets are produced this way. Ferrite magnets can be wet pressed or dry pressed. Wet pressing yields better magnetic properties, but poorer physical tolerances. Generally, the powder is dry for grade 1 or 5 materials, and wet for grade 8 and higher materials. Sintering involves subjecting the material to high temperatures to fuse the pressed powder together, thus creating a solid material. Magnets produced through this process usually need to have some finish machining, otherwise surface finishes and tolerances are not acceptable. Some manufacturers extrude instead of press wet powder slurry and then sinter the material. This is sometimes done for arc segment shapes, where the arc cross-section is extruded in long lengths, sintered, and then cut to length.
 
Injection Molding: Ferrite powder is mixed into a compound and then injection molded in the same way as plastic.
Tooling for this manufacturing process is usually very costly. However, parts produced through this process can have very intricate shapes and tight tolerances. Injection molded ferrite properties are either lower or about the same as grade 1 Ferrite.
 


Surface Treatments
 The corrosion resistance of Ferrite is considered excellent , and no surface treatments are required.
However, Ferrite magnets may have a thin film of fine magnet powder on the surface and for clean, non-contaminated applications, some form of coating may be required.
 
 
Magnetizing and Handling
Ferrite magnets require magnetizing fields of about 10 kOe.
They can be magnetized with multiple poles on one or both pole surfaces.
No special handling precautions are required, except that large blocks of Ferrite magnets are powerful, and care should be taken to ensure that they do not snap towards each other.
 

Temperature Effects
Up to about 840F, changes in magnetization are largely reversible, while changes between 840F and 1800 F are re-magnetizable.
For all Ferrite magnets, the degradation of magnetic properties is essentially linear with temperature.
At 350 F, about 75% of room temperature magnetization is retained, and at 550 F, about 50% is retained.
 

Common Applications for Ferrite Magnets
Ferrite magnets are widely used in motors, magnetic couplings, for sensing, loudspeakers, holding-magnet systems, crafts, magnetic therapy, novelties, and toys.
 
 
  Chinese standard -sj/T10410 2000 permanent ferrite magnet standard
Material Br HcB HcJ (BH)max
mT KG KA/m Oe KA/m Oe Kj/m³ MGOe
Y8T 200~235 ≥2000 125~160 ≥1570 210~280 ≥2610 6.5~9.5 ≥0.8
Y22H 310~360 ≥3100 220~250 ≥2770 280~320 ≥3520 20.0~24.0 ≥2.5
Y25 360~400 ≥3600 135~170 ≥1700 140~200 ≥1760 22.5~28.0 ≥2.8
Y26H-1 360~390 ≥3600 220~250 ≥2512 225~255 ≥2830 23.0~28.0 ≥2.9
Y26H-2 360-380 ≥3600 263-288 ≥3300 318-350 ≥4000 24.0-28.0 ≥3.0
Y27H 370~400 ≥3500 225-240 ≥2830 235-260 ≥2950 25.0~29.0 ≥3.1
Y28 370-400 ≥3700 175-210 ≥2200 180-220 ≥2260 26.0-30.0 ≥3.3
Y28H-1 380-400 ≥3800 240-260 ≥3020 250-280 ≥3140 27.0-30.0 ≥3.1
Y28H-2 360-380 ≥3600 271-295 ≥3400 382-405 ≥1800 26.0-30.0 ≥3.3
Y30 370~400 3.7~4.0 175~210 2.20~2.64 180~220 2.26~2.77 26.0~30.0 3.3~3.8
Y30H-1 380~400 ≥3800 230-275 ≥2890 235-290 ≥2950 27.0~32.5 ≥3.4
Y30H-2 395-415 ≥3950 275-300 ≥3460 310-335 ≥3900 27.0~32.0 ≥3.4
Y32 400~420 ≥4000 160~190 ≥2010 165~195 ≥2070 30.0~33.5 ≥3.8
Y32H-1 400-420 ≥4000 190-230 ≥2390 230-250 ≥2890 34.5-35.0 ≥4.0
Y32H-2 400-440 ≥4000 224-240 ≥2810 230-250 ≥2890 31.0-34.0 ≥3.9
Y33 410~430 ≥4100 220~250 ≥2760 225~255 ≥2830 31.5~35.0 ≥4.0
Y33H 410-430 ≥4100 250-270 ≥3140 250-275 ≥3140 31.5-35.0 ≥4.0
Y34 420-440 ≥4200 200-230 ≥2510 205-235 ≥2580 32.5-36.0 ≥4.1
Y35 430-450 ≥4300 215-239 ≥2700 217-242 ≥2730 33.1-33.2 ≥4.2
Y36 440-450 ≥4400 247-271 ≥3100 250-374 ≥4400 35.1-38.3 ≥4.4
Y38 440-460 ≥4400 285-305 ≥3580 294-310 ≥3690 36.6-40.6 ≥4.6
Y40 450-460 ≥4500 330-354 ≥4150 340-360 ≥4270 37.6-41.8 ≥4.7
 
USA standard - permanent ferrite magnet industry standard of USA
Material Br HcB HcJ (BH)max
mT KG KA/m KOe KA/e KOe kj/m³ MGOe
C1 230 2.3 148 1.86 258 3.5 8.36 1.05
C5 380 3.8 191 2.4 199 2.5 27 3.4
C7 340 3.4 258 3.23 318 4.00 21.9 2.75
C8(=C8A) 385 3.85 235 2.95 242 3.05 27.8 3.5
C8B 420 4.2 232 2.913 236 2.96 32.8 4.12
C9 380 3.8 280 3.516 320 4.01 26.4 3.32
C10 400 4.0 288 3.617 280 3.51 30.4 3.82
C11 430 4.3 200 2.512 204 2.56 34.4 4.32
 
 
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PRODUCT NAME
GRADE
SIZE
SHAPE
COATING(if any)
ORDER QUANTITY 
 

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