What is the difference between manganese-zinc ferrite bead and nickel-zinc ferrite bead
Ferrite magnetic ring inductance is divided into manganese-zinc ferrite magnetic ring and nickel-zinc ferrite magnetic ring. According to the different materials used, the calcined material is different.
The nickel-zinc ferrite magnetic ring is mainly made of iron, nickel, and zinc oxides or salts, and is manufactured by electronic ceramic technology.
The manganese-zinc ferrite magnetic ring is made of iron, manganese, zinc oxides and salts, and is also manufactured by electronic ceramic technology
The two materials are basically the same in terms of materials and processes. The difference is that the two materials of manganese and nickel are different. Because of these two different materials, their use effects on the same product are greatly different.
The manganese-zinc ferrite bead has high magnetic permeability. It can be used in the frequency range of 1MHz to hundreds of megahertz. Except for common mode inductors, for applications below 70MHz, the impedance of manganese-zinc materials makes it a choice; manganese-zinc ferrite magnetic rings are generally used in the frequency range of kilohertz to megahertz. Can make inductors, transformers, filter cores, magnetic heads and antenna rods.
The nickel-zinc ferrite bead has low magnetic permeability and can be used in applications where the operating frequency is lower than 5MHz. For applications from 70MHz to hundreds of gigahertz, nickel-zinc materials are recommended. Nickel-zinc ferrite magnetic rings can be used to make magnetic cores for mid-peripheral transformers, magnetic heads, short-wave antenna rods, tuned inductance reactors, and magnetic saturation amplifiers. The application range and product maturity are superior to those of Mn-Zn ferrite magnetic rings. Much.
Visual inspection method:
Because manganese-zinc ferrite generally has a relatively high magnetic permeability, large crystal grains, and a relatively compact structure, it is often black.
However, nickel-zinc ferrite generally has a relatively low magnetic permeability, fine and small grains, and a porous structure, which is often brown, especially when the sintering temperature is relatively low during the production process.
According to these characteristics, we can distinguish them by visual inspection. Visual inspection is a relatively rough method, and it can be mastered after certain practice.
In a place with relatively bright light, if you see that the color of ferrite is black and there are brighter crystals, this magnetic core is manganese-zinc ferrite;
If you see that the ferrite is brown, the luster is dim, and the crystal grains are not dazzling, the core is nickel-zinc ferrite.