Author：Date：2019-7-31
What is nanocrystalline materil?
The first thing to know is what is amorphous. During the preparation of the metal, if it is cooled by an ultra-fast cooling rate during its solidification process, the atom will be frozen in an unorganized state at this time, and it will not be too late to be re-arranged, and the structure formed at this time is Amorphous. Nanocrystals are formed on the basis of amorphous state by special heat treatment to form crystal nuclei and grow up. However, to control the grain size at the nanometer level, do not form complete crystals. The structure formed at this time is nanocrystals.
How is amorphous prepared?
The principle of the amorphous preparation process is very simple, that is, after the parent is financialized, it is sprayed on a high-speed rotating cooling roller through a nozzle package, and instantaneously cooled to form a thin strip like paper. It has several features:
High temperature, liquid alloy temperature is basically between 1400 ° C ~ 1500 ° C, instantaneous solidification to near room temperature, requires a very high cooling rate, cooling rate reached a level of millions per second.
High speed, that is, the speed of the spray belt is also very fast, 30m / s, high precision, the thickness of the sprayed strip is 20-30μm, very thin, such precision control is realized by the design of the slit and the nozzle pitch under the nozzle package of.
Method for preparing nanocrystalline alloy
The nanocrystalline soft magnetic alloy is realized by a special heat treatment process for the amorphous strip. First, an amorphous strip having a specific composition is placed in a heat treatment furnace to produce crystal grains within 100 nm by orientation control, and a mixture of amorphous and nanocrystalline is actually formed.
Advantages of nanocrystalline alloys
Compared with cobalt-based amorphous and ferrite, nanocrystalline has high saturation magnetic induction and can reduce the volume of magnetic devices. High magnetic permeability, low loss, and low coercivity can reduce the loss of magnetic devices. Therefore, nanocrystalline alloy is the best soft magnetic material in high frequency power electronics applications.
Method for preparing nanocrystalline alloy
The nanocrystalline soft magnetic alloy is realized by a special heat treatment process for the amorphous strip. First, an amorphous strip having a specific composition is placed in a heat treatment furnace to produce crystal grains within 100 nm by orientation control, and a mixture of amorphous and nanocrystalline is actually formed.
Advantages of nanocrystalline alloys
Compared with cobalt-based amorphous and ferrite, nanocrystalline has high saturation magnetic induction and can reduce the volume of magnetic devices. High magnetic permeability, low loss, and low coercivity can reduce the loss of magnetic devices. Therefore, nanocrystalline alloy is the best soft magnetic material in high frequency power electronics applications.
Application of nanocrystalline soft magnetic alloy in wireless charging
Wireless charging has become popular in mobile phones. There are also many products in the field of wear. In the future, wireless charging will be popular in homes, offices, public places, travel tools, and transportation. In the future, there will be popularity of electric vehicles.
Wireless Energy Transmission (WPT): The structure of a smart phone, smart wearable (low power) wireless charging is similar to a transformer, consisting of a transmitting end and a receiving end. The transmitting end and the receiving end are both made of a coil and a magnetic material, and the magnetic materials are different. The choice is ferrite, amorphous, nanocrystalline and so on.
remark: News from Amophous China
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