Hard Ferrite Magnet Cut Magnet With Groove C-8
Hard magnetic ferrite can be called permanent magnetic material, mainly including Ba - ferrite, Sr - ferrite, Pb - ferrite, and CO - ferrite of spinel.
The production of hard magnetic ferrite requires not only high purity and precise formula composition of raw materials, but also moderate size, uniform distribution, reasonable orientation and compact structure of magnetic grains.
Hard magnetic ferrite presintering temperature is in commonly 1100 ~ 1300 ℃. Sintering temperature at 1150 ~ 1250 ℃ in the oxidation atmosphere. Such as Ba - ferrite is the raw material under the temperature of 1100 ~ 1200 ℃ presintering, forming under the temperature of 1150 ~ 1250 ℃ after sintering. Co - ferrite at about 900 ℃ temperature presintering, again under the temperature of 1100 ℃ decompression after firing, the Curie temperature of the applied magnetic field, the temperature between 300 ℃ and then made slow cooling.
The sintering density of ferrite is related to the residual magnetic induction intensity. Although the increase of sintering temperature can increase the density of magnetic body, it will lead to the growth of magnetic phase grain, which is unfavorable to magnetic induction strength. The correct method is to introduce additives to accelerate the sintering speed, increase the density, and effectively inhibit the growth of magnetic particles. Admixtures commonly used include Al2O3, AS2O3 and Bi2O3.
Hard magnetic ferrite can according to customer's requirement of the specifications of the size of cutting processing, at the same time, permanent magnet ferrite magnets can according to customer requirements for edge grinding, chamfering, such as processing, permanent magnet ferrite magnets to punch, because the physical properties of non-conductive, so also cannot undertake wire-cutting processing, special-shaped processing all must depend on the grinding wheel, fixture.