APPLIED MAGNET TECHNOLOGY
 

Ferrite powders

Pre-sintered Ferrite Powders

Properties of Strontium Ferrite for Dry Pressing

No Material Magnetic properties
Br(mT) Hcb(kA/m) Hci(kA/m) (BH)max(kJ/m3)
Typical Min Typical Min Typical Min Typical
1 BaFe12O19 390 380 159 151 163 155 28.7
2 SrFe12O19 410 400 191 175 199 183 31.8
3 SrFe12O19 390 380 231 215 239 223 28.7
4 SrFe12O19 370 360 259 243 279 263 25.5
5 SrFe12O19 350 340 259 243 318 294 23.1
6 SrFe12O19 430 420 191 175 199 183 35.0
7 SrFe12O19 410 400 231 223 239 231 31.8
8 SrFe12O19 390 380 283 267 302 279 28.7
9 SrFe12O19 370 360 279 263 342 318 25.5
10 SrFe12O19 350 340 263 247 398 374 23.1
11 SrFe12O19 410 400 271 255 279 263 31.8
12 SrFe12O19 400 390 294 279 318 294 30.2

Properties of Barrium Ferrite for Dry Pressing

No Br Hcb Hcj (BH)max
  mT Gs KA/m Oe KA/m Oe KJ/m3 MGOe
1 230 2300 150 1880 240 3010 9.50 1.19
2 230 2300 155 1950 278 3500 9.60 1.20
3 210 2100 150 1880 350 4400 9.00 1.13
4 370 3700 215 2700 231 2900 24.6 3.08
5 385 3850 219 2750 231 2900 26.0 3.27
6 395 3950 231 2900 235 2950 28.8 3.60

Magnetic Properties of Strontium Ferrite Powders for Wet pressing

No Characteristics of products
Br(mT) bHc(kA/m) ihc(kA/m) (BH)max(kJ/m3)
Typical Min Typical Min Typical Min Typical Min
1 225 220 143 139 215 199 7.96 7.56
195 190 123 119 215 199 5.57 5.17
2 230 225 143 139 255 239 8.36 7.96
215 210 135 131 255 239 7.56 7.16
3 235 230 147 143 239 223 8.75 8.36
200 195 127 123 239 223 5.97 5.57

Ferrite Powders for bonded magnets

Strontium Plastic Bonded Ferrite Magnetic Powders are suitable for making various bonded magnets.

They have good compatibility with different kinds of composite size and high filling capacity.

They can be used for making different kinds of magnets by extrusion or injection molding display:

No Material Characteristics of products Forming methods
Br(mT) bHc(kA/m) iHc(kA/m) (BH)max(kj/m3) Mean size
(¦Ìm)
Typical Min Typical Min Typical Min Typical Min
1. BaFe12O19 150 140 95.5 87.5 183 167 3.98 3.58 2-4 Extrusion
or
Calendering
2. BaFe12O19 180 175 119 115 183 167 5.97 5.57 1.1-1.4
3. BaFe12O19 180 175 111 107 151 143 5.57 5.17 1.5-1.8
4. BaFe12O19 180 175 111 107 151 143 5.57 5.17 1.8-2.1
5. SrFe12O19 180 175 119 115 183 167 5.97 5.57 1.1-1.4
6. SrFe12O19 180 175 111 107 159 143 5.57 5.17 1.5-1.8
7. SrFe12O19 180 175 111 107 159 143 5.57 5.17 1.8-2.1
8. SrFe12O19 250 240 167 159 223 199 11.9 11.1 1.3-1.6 Magnetic orientation
9. SrFe12O19 245 235 159 151 223 215 11.1 10.4 1.3-1.6 Calendering
orientation
10. SrFe12O19 250 240 175 167 255 239 11.9 11.1 1.0-1.3
11. BaFe12O19 85 83     223 215     0.50-0.75 Film coating

Some technological notes:

a. Before production of bonded magnets, the powders should avoid being humidified and being mixed with other materials or impurities.

b. The mixture ratio of binders and plasticizers should be defined according to the grade of the powder. The powder, binders and plasticizers should be mixed uniformly.

c. The working temperature of extruding should be controlled between 50OC to 90OC (calendaring plate is usually between 80OC to 120OC)

d. Adjustment of  the extruding speed, calendaring speed and times, according to the property required is necessary

 
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