The physical properties of the magnet

In the actual production of ferrite magnets, the chemical composition of good raw material, and sometimes may not be able to get good performance and microstructure of ferrite magnets,magnetic plates the reason is the impact of physical properties. The physical properties of iron oxide are listed including the average particle size APS, the specific surface area SSA and bulk density BD. Since the Mn-Zn ferrite magnet formulations of iron oxide accounts for about 70 percent, so the value of its APS APS have a great impact on the value of a ferrite magnet powder. In general, the value of small iron APS, APS value of a ferrite magnet powder is also small, help speed up the rate of chemical reactions. However, given the powder particles are too small and not conducive to after-pressing and sintering easy to crystallize the situation, APS value should not be too small. Obviously, when iron APS is too large, in the pre-burn, because the particle size is large, only the spinel phase diffusion reaction, it can not be further grain growth process. This will inevitably lead to the activation energy required for sintering improve, not conducive to solid-phase reaction.