The standard from International Electronics Committee(IEC404-8-1)
| Grade |
Allowed Value (min/typical) |
|
Br |
Hcb(BHC) |
Hcj(IHC) |
(BH)max |
|
MT |
KG |
KA/m |
KOe |
KA/m |
KOe |
Kj/m³ |
MGOe |
| HF8/22 |
200/220 |
2.00/2.20 |
125/140 |
1.57/1.76 |
220/230 |
2.76/2.89 |
6.5/6.8 |
0.8/1.1 |
| HF20/19 |
320/333 |
3.20/3.33 |
170/190 |
2.14/2.39 |
190/200 |
2.39/2.51 |
20.0/21.0 |
2.5/2.7 |
| HF20/28 |
310/325 |
3.10/3.25 |
220/230 |
2.76/2.89 |
280/290 |
3.52/3.64 |
20.0/21.0 |
2.5/2.7 |
| HF22/30 |
350/365 |
3.50/3.65 |
255/265 |
3.20/3.33 |
290/300 |
3.64/3.77 |
22.0/23.5 |
2.8/3.0 |
| HF24/16 |
350/365 |
3.50/3.65 |
155/175 |
1.95/2.20 |
160/180 |
2.01/2.26 |
24.0/25.5 |
3.0/3.2 |
| HF24/23 |
350/365 |
3.50/3.65 |
220/230 |
2.76/2.89 |
230/240 |
2.89/3.01 |
24.0/25.5 |
3.0/3.2 |
| HF24/35 |
360/370 |
3.60/3.70 |
260/270 |
3.27/3.39 |
350/360 |
4.40/4.52 |
24.0/25.5 |
3.0/3.2 |
| HF26/16 |
370/380 |
3.70/3.80 |
155/175 |
1.95/2.20 |
160/180 |
2.01/2.26 |
26.0/27.0 |
3.2/3.4 |
| HF26/18 |
370/380 |
3.70/3.80 |
175/190 |
2.20/2.39 |
180/190 |
2.26/2.39 |
26.0/27.0 |
3.3/3.4 |
| HF26/24 |
370/380 |
3.70/3.80 |
230/240 |
2.89/3.01 |
240/250 |
3.01/3.14 |
26.0/27.0 |
3.3/3.4 |
| HF26/26 |
370/380 |
3.70/3.80 |
230/240 |
2.89/3.01 |
260/270 |
3.27/3.39 |
26.0/27.0 |
3.3/3.4 |
| HF26/30 |
385/395 |
3.85/3.95 |
260/270 |
3.27/3.39 |
300/310 |
3.77/3.89 |
26.0/27.0 |
3.3/3.4 |
| HF28/26 |
385/395 |
3.85/3.95 |
250/265 |
3.14/3.33 |
260/275 |
3.27/3.45 |
28.0/30.0 |
3.5/3.8 |
| HF28/28 |
385/395 |
3.85/3.95 |
260/270 |
3.27/3.39 |
280/290 |
3.50/3.60 |
28.0/30.0 |
3.5/3.8 |
| HF30/26 |
395/405 |
3.95/4.05 |
250/260 |
3.14/3.33 |
260/270 |
3.27/3.39 |
30.0/31.5 |
3.8/3.9 |
| HF32/17 |
410/420 |
4.10/4.20 |
160/180 |
2.01/2.26 |
165/175 |
2.07/2.20 |
32.0/33.0 |
4.0/4.1 |
| HF32/22 |
410/420 |
4.10/4.20 |
215/225 |
2.70/2.83 |
220/230 |
2.76/2.89 |
32.0/33.0 |
4.0/4.1 |
| HF32/25 |
410/420 |
4.10/4.20 |
240/250 |
3.01/3.14 |
250/260 |
3.14/3.27 |
32.0/33.0 |
4.0/4.1 |
Physical
property of hard ferrite mangets
| Parameters |
Mark |
Unit |
Value |
| Recoil Permeability |
Urce |
- |
1.05-1.3 |
| Curie temperture |
Tc |
0C |
460 |
| The temperature of Br |
|
0C-1 |
-0.2% |
| The temperature of Hcj |
|
0C-1 |
0.2-0.5% |
| Density |
D |
g/cm3 |
4.5-5.1 |
| Resistivity |
P |
|
 104
|
| The coefficient of linear expansion |
|
0C-1 |
7-15x10-6 |
| Hardness |
HV |
- |
480-580 |
l Inspection standard for permanent magnet
1) When the permanent magnet is not
supplied with specific size and shape, the properties of material
should be tested. The test standard is as per GB/T3217-95 permanent
magnet (hard magnet) material test trial method ,GJB2453-95rare
earth permanent magnet material general criterion
and relevant enterprise standard. GB/T3217 stipulated the
test method. Enterprise standard stipulated the test process
and sampling method.
2)When the permanent magnet is supplied
with specific size and shape, the properties of the magnetic
component should be tested. The properties of the material
are only tested for reference.
3) For different permanent magnetic
components, the test parameters and test methods are
different. For magnetic ring, the test parameter is diametric
flux density. For magnetic segment and block, the parameters
can be surface field, magnetic flux etc. The magnetic
flux is better.A digital tesla meter can test diametric flux
density With a transverse sensor. Magnetic flux can
be tested by permanent magnet tesla meter and Helmholtz coil.For
more information about the international standard, you may
turn to the following reference:
IEC 404-5(1982) magnetic
material Part 5:test measure for hard magnet(permanent magnet)
material properties.
JISC
2501-1989 Test method for magnetic material(Japan)
4) When the permanent magnet is supplied
as magnetic assembly or component,the properties of the magnetic
assembly or component should be tested. The buyer and
seller will negotiate and decide the specific test method
with each other.
5) Unless specified by the user, we
will adopt standard sampling method for the final test of
the permanent magnet.
 |
