Ceramic/Ferrite

Ceramic/Ferrite

EAM Hard Ferrite/Ceramic Magnets – For Every Application

Sintered Hard Ferrite or “Ceramic” magnets are among the most popular permanent magnets available today. They are made form a combination of either Barium or Strontium Ferrite and Iron Oxide, and exhibit a high degree of coercive strength, making them more resistant to demagnetization. They are a low-cost solution to a wide array of magnetic component applications.

Ceramic magnets can be produced with either isotropic or anisotropic properties. The most common grades produced are C1, C5, and C8. C1 material exhibits the lowest energy product, however it is isotropic – indicating that it can be magnetized in any direction. It should be noted that slightly more magnetic strength will be realized when parts are magnetized through the pressing (usually the shortest) dimension.

Grades 5 and 8 Ceramic materials are anisotropic, and must therefore be magnetized in the manufactured dimension. They exhibit higher levels of magnetic force than do “Ceramic 1” materials.

Hard Ferrite magnets have excellent corrosion resistance and have normal operating capabilities between -40°C and +250°C.

Properties

Ceramic Magnetic Material Characteristics

Material & Grade Max. Energy Product Remanence Coercive Force Rev. Temp. Coefficient Curie Temp Density
(BH) max Br Hc Hcl % / °C Tc D
MGOe kJ/m3 G mT Oe kA/m Oe kA/m % / °K °C g/cm3
Ceramic-1 1.05 8.4 2,300 230 1,850 147 3,250 259 -0.2 450° C 4.8
Ceramic-5 3.04 27.1 3,800 380 2,400 191 2,550 203 -0.2 450° C 4.8
Ceramic-7 2.75 21.9 3,400 340 3,250 259 4,000 318 -0.2 450° C 4.8
Ceramic-8 3.50 27.9 3,850 385 2,950 235 3,050 243 -0.2 450° C 4.9
Ceramic-8B 4.00 31.8 4,100 410 2,900 231 3,000 239 -0.2 450° C 4.9
Ceramic-8A 3.40 27.1 3,800 380 3,400 271 3,900 310 -0.2 450° C 4.9
Ceramic-8C 4.00 31.8 4,000 400 3,650 290 4,000 318 -0.2 450° C 4.9

EAM’s knowledgeable product development team will assist you in choosing the optimal combination of binder and magnet material for your specific application.

EAM-CeramicMatProperties.pdf

Charts & Data

Ceramic / Sintered Hard Ferrite
Demagnetization Curves

 

CERAMIC-1 DEMAGNETIZATION CURVE

One

CERAMIC-5 DEMAGNETIZATION CURVE

One
One
One

EAM-Ceramic-Demag-Curves.pdf

Ceramic 8

Case Studies

Case Studies

Anesthesia Equipment Needed a Better Magnetic Valve... Read more

Magnetic Stirrer For Laboratory Equipment Manufacturer Read more

Critical Pump Mechanism for Heart & Lung Machine Read more

Processing

PROCESS FLOW DIAGRAM
Goods Inwards Inspection
Granulate
Dry
Dry Press
(Isotropic)
Wet Press in Magnetic
Field(Anistropic)
Dry Press in Magnetic
Field(Anistropic)
SINTERING
Grinding/Finishing
Magnetization
Inspection
packing and despatch

Processing Ceramic / Sintered Hard Ferrite Magnets

Processing begins with granulation or drying of the ferrite powder raw material before axial pressing to form compacts of the required shape.

Isotropic hard ferrite magnets are produced by dry pressing of granulated ferrite raw material using mechanical or hydraulic presses. Anisotropic magnet properties are achieved by pressing in a magnetic field. In this case, pressing may be carried out using dry powder or wet slurry dependent upon the level of anisotropic properties required. Specially designed electromagnetic tools are employed to produce the anisotropic grades. With all pressing techniques, continuous in-process monitoring techniques ensure consistent green density is maintained on all products.

After pressing the compacts are sintered in air at high temperature to consolidate them, thereby giving their definitive shape and strength.

Grinding and/or other finishing operations can be used to achieve very close dimensional tolerances if necessary.

Components may be magnetized before final inspection, packing and despatch.

Browse Standard Parts

Ceramic Standard Parts

Need a stock magnet for prototyping, design work, crafts or home projects?

We’ve made it easy to browse EAM’s standard parts and make purchases easily with a credit card. All orders ship direct from our NY or PA locations.

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DISC MAGNETS

Neodymium Disc Diagram

EAM Part No. O/D “A” (Inches) Thickness “B” (Inches) Grade  
CM-0517 0.375 0.090 5 Info
CM-0514 0.375 0.250 5 Info
CM-0014 0.500 0.197 5 Info
CM-0007 0.709 0.197 5 Info
CM-0411 0.875 1.000 5 Info
CM-0499 1.000 0.157 5 Info
CM-0559 1.000 0.250 5 Info

RING MAGNETS

Ceramic Ring Diagram

EAM Part No. O/D
“A” (Inches)
I/D “B” (Inches) Thickness
“C” (Inches)
Grade  
CM-0308 1.235 0.375 0.561 5 Info
CM-0067 1.750 0.866 0.276 5 Info
CM-0538 2.375 1.000 0.290 5 Info
CM-0834 2.878 1.782 0.500 5 Info
CM-0483 3.400 1.312 0.425 5 Info

RECTANGULAR BLOCK MAGNETS

Ceramic Rectangular Block Diagram

EAM Part No. Length
“A” (Inches)
Width “B” (Inches) Thickness
“C” (Inches)
Grade
CM-0433 1.875 0.875 0.375 5 Info
CM-0029 2.5 0.625 0.5 5 Info
CM-0509 4 0.5 0.75 5 Info
CM-0002 6 4 1 5 Info