CN112899695B - Nanocrystalline strip heat treatment process - Google Patents

Nanocrystalline strip heat treatment process Download PDF

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CN112899695B
CN112899695B CN202110055663.3A CN202110055663A CN112899695B CN 112899695 B CN112899695 B CN 112899695B CN 202110055663 A CN202110055663 A CN 202110055663A CN 112899695 B CN112899695 B CN 112899695B
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nanocrystalline
nanocrystalline strip
magnetic core
annealing furnace
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CN112899695A (en
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姜桂君
王磊
张继林
董泽琳
周苗苗
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Sunway Communication Jiangsu Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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Abstract

The invention discloses a heat treatment process of a nanocrystalline strip, which comprises the following steps of obtaining a nanocrystalline strip, winding the nanocrystalline strip into a ring shape, and obtaining a nanocrystalline magnetic core; preheating an annealing furnace, vacuumizing and introducing nitrogen; putting the nanocrystalline magnetic core into an annealing furnace after preheating is completed; pre-crystallizing the nanocrystalline magnetic core, increasing the temperature in an annealing furnace, preserving heat, and circularly introducing oxygen with the content of omega 1 A mixed gas of oxygen and an inert gas; crystallizing the nanocrystalline magnetic core, increasing the temperature in an annealing furnace, preserving heat, and circularly introducing oxygen with the content of omega 2 Wherein omega is a mixture of oxygen and an inert gas 2 Greater than omega 1 The method comprises the steps of carrying out a first treatment on the surface of the And cooling the nanocrystalline magnetic core to room temperature along with the furnace, and taking out the nanocrystalline magnetic core. The resistivity of the nanocrystalline strip is improved, so that the high-frequency loss of the nanocrystalline strip is reduced, and the use frequency of the nanocrystalline strip in wireless charging equipment is improved to 500kHz-1000kHz.

Description

Nanocrystalline strip heat treatment process
Technical Field
The invention relates to the technical field of wireless charging, in particular to a heat treatment process for a nanocrystalline strip.
Background
The nanocrystalline strip is a metal soft magnetic material with various excellent performances such as high magnetic induction intensity, high magnetic permeability and the like, can be formed at one time through a plane flow casting process, has controllable thickness, short process flow and low energy consumption, and is an ideal material applied to the fields of high-frequency transformers, common-mode inductances, high-frequency motors and the like.
Along with the development of wireless charging technology, in order to protect other electronic components inside an electronic product from the interference of electromagnetic fields generated in the wireless charging process and improve the energy conversion efficiency of wireless charging, the magnetic conduction shielding sheet becomes a necessary component in a wireless charging module, and the nanocrystalline strip is an ideal magnetic conduction shielding material due to high magnetic conductivity, high saturation magnetic induction intensity and thinner thickness.
The current wireless charging frequency is 100-200kHz, and the wireless charging technology is advancing to 300kHz-900kHz high frequency. The resistivity of the nanocrystalline strip is lower, the high-frequency loss performance of the nanocrystalline strip is not as good as that of ferrite, but the magnetic induction intensity of the nanocrystalline material is 3-5 times that of ferrite, and the thickness of the magnetic conduction shielding sheet made of the nanocrystalline strip is 1/2-1/3 of that of the ferrite magnetic conduction shielding sheet with the same performance, so how to reduce the high-frequency loss of the nanocrystalline strip is a problem to be solved in the process of preparing the magnetic conduction shielding sheet with high magnetic induction intensity and thin thickness.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: provided is a heat treatment process for a nanocrystalline strip capable of reducing high-frequency loss of the nanocrystalline strip.
In order to solve the technical problems, the invention adopts the following technical scheme: the heat treatment process of the nanocrystalline strip comprises the following steps of obtaining a nanocrystalline strip, and winding the nanocrystalline strip into a ring shape to obtain a nanocrystalline magnetic core; preheating an annealing furnace, vacuumizing and introducing nitrogen; placing the nanocrystalline magnetic core into the annealing furnace after preheating is completed; pre-crystallizing the nanocrystalline magnetic core, increasing the temperature in the annealing furnace, preserving heat, and circularly introducing oxygen with the content of omega 1 A mixed gas of oxygen and an inert gas; crystallizing the nanocrystalline magnetic core, increasing the temperature in the annealing furnace, preserving heat, and circularly introducing oxygen with the content of omega 2 Wherein omega is a mixture of oxygen and an inert gas 2 Greater than omega 1 The method comprises the steps of carrying out a first treatment on the surface of the And cooling the nanocrystalline magnetic core to room temperature along with the furnace, and taking out the nanocrystalline magnetic core.
The invention has the beneficial effects that: according to the heat treatment process of the nanocrystalline strip, mixed gas containing a certain amount of oxygen is respectively and circularly introduced in a nanocrystalline strip pre-crystallization stage and a crystallization stage, when the mixed gas is introduced in the pre-crystallization stage, the oxygen can permeate into crystal blanks of the nanocrystalline at a high temperature, the growth of nanocrystalline grains can be restrained due to the pinning effect of oxygen atoms, meanwhile, a layer of oxide film can be formed between the nanocrystalline grains when the mixed gas with higher oxygen content is introduced in the crystallization stage, the resistivity of the nanocrystalline strip is further improved, the high-frequency loss of the nanocrystalline strip is reduced, and the use frequency of the nanocrystalline strip in wireless charging equipment is improved to 500kHz-1000kHz.
Drawings
Fig. 1 is a step diagram of a heat treatment process for a nanocrystalline strip according to a first embodiment of the present invention.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
Referring to fig. 1, a heat treatment process for a nanocrystalline strip includes the steps of obtaining a nanocrystalline strip, and winding the nanocrystalline strip into a ring shape to obtain a nanocrystalline magnetic core; preheating an annealing furnace, vacuumizing and introducing nitrogen; placing the nanocrystalline magnetic core into the annealing furnace after preheating is completed; pre-crystallizing the nanocrystalline magnetic core, increasing the temperature in the annealing furnace, preserving heat, and circularly introducing oxygen with the content of omega 1 A mixed gas of oxygen and an inert gas; crystallizing the nanocrystalline magnetic core, increasing the temperature in the annealing furnace, preserving heat, and circularly introducing oxygen with the content of omega 2 Wherein omega is a mixture of oxygen and an inert gas 2 Greater than omega 1 The method comprises the steps of carrying out a first treatment on the surface of the And cooling the nanocrystalline magnetic core to room temperature along with the furnace, and taking out the nanocrystalline magnetic core.
The working principle of the invention is briefly described as follows: in the heat treatment process of the nanocrystalline strip, mixed gas containing a certain amount of oxygen is respectively and circularly introduced in a nanocrystalline strip pre-crystallization stage and a crystallization stage, oxygen can permeate between crystal blanks of the nanocrystalline at a high temperature when the mixed gas is introduced in the pre-crystallization stage, the growth of nanocrystalline grains can be restrained due to the pinning effect of oxygen atoms, and meanwhile, a layer of oxide film can be formed between the nanocrystalline grains when the mixed gas with higher oxygen content is introduced in the crystallization stage, so that the resistivity of the nanocrystalline strip is improved.
From the above description, the beneficial effects of the invention are as follows: the heat treatment process of the nanocrystalline strip provided by the invention improves the resistivity of the nanocrystalline strip, so that the high-frequency loss of the nanocrystalline strip is reduced, and the use frequency of the nanocrystalline strip in wireless charging equipment is improved to 500kHz-1000kHz.
Further, the surface tension of the nanocrystalline magnetic core is 2-10N.
From the above description, it is apparent that the surface tension of the nanocrystalline core wound with the nanocrystalline strip is between 2 and 10N, so that the nanocrystalline core can maintain a toroidal state during the heat treatment.
Further, the concentration of nitrogen introduced in the preheating process of the annealing furnace is 99.99%.
From the above description, it is known that high-concentration nitrogen gas is introduced into the annealing furnace to expel air from the annealing furnace, so that water vapor and the like in the air during the heat treatment process are prevented from adversely affecting the heat treatment.
Further, the annealing furnace is heated to 150-250 ℃ in the preheating process of the annealing furnace.
From the above description, it can be seen that preheating the annealing furnace to 150-250 ℃ and then placing the nanocrystalline magnetic core in the annealing furnace is beneficial to reducing the heating time of the nanocrystalline magnetic core in the annealing furnace, and reducing the heating time of the annealing furnace to the pre-crystallization treatment temperature after the nanocrystalline magnetic core is placed in the annealing furnace.
Further, when the nanocrystalline magnetic core is subjected to the pre-crystallization treatment, the temperature in the annealing furnace is raised from 150-250 ℃ to 390-450 ℃ at the heating rate of 5-10 ℃/min, and the temperature is kept for 30-60min.
Further, after the nanocrystalline magnetic core is subjected to the pre-crystallization treatment, the method further comprises the steps of raising the temperature in the annealing furnace from 390-450 ℃ to 470-510 ℃ at a heating rate of 3-5 ℃/min, and preserving the heat for 45-90min.
Further, when the nanocrystalline magnetic core is subjected to crystallization treatment, the temperature in the annealing furnace is raised from 470-510 ℃ to 540-600 ℃ at a heating rate of 3-5 ℃/min, and the temperature is kept for 120-240min.
From the above description, it is known that the temperature is raised in stages during the heat treatment to perform the pre-crystallization treatment and the crystallization treatment on the nanocrystalline core, so that oxygen can sufficiently permeate between the grains of the nanocrystalline.
Further, omega 1 The range of the value of (2) is 10-20%.
Further, omega 2 The value range of (2) is 20-100%.
Example 1
Referring to fig. 1, a first embodiment of the present invention is as follows: as shown in fig. 1, a heat treatment process for a nanocrystalline strip includes the steps of,
s1, obtaining a nanocrystalline strip, and winding the nanocrystalline strip into a ring shape to obtain the nanocrystalline magnetic core.
In step S1, the surface tension of the nanocrystalline magnetic core wound by the nanocrystalline strip is 2-10N, so as to ensure that the nanocrystalline magnetic core maintains an annular state in the subsequent processing process, and avoid the nanocrystalline magnetic core from automatically recovering to be in a long strip shape in the subsequent processing process.
S2, preheating an annealing furnace, vacuumizing and introducing nitrogen;
in the step S2, the nanocrystalline magnetic core is placed between the annealing furnaces, the annealing furnaces are heated to 150-250 ℃, the time for heating the nanocrystalline magnetic core to the heat treatment temperature in the annealing furnaces after the nanocrystalline magnetic core is placed in the annealing furnaces is reduced, and meanwhile unexpected change of the nanocrystalline magnetic core due to long-time heating in the annealing furnaces is avoided.
And (3) sucking out air in the annealing furnace and introducing nitrogen with the concentration of 99.99% into the annealing furnace while preheating the annealing furnace so as to expel the air in the annealing furnace out of the annealing furnace, so that the heat treatment of the nanocrystalline strip is performed in a nitrogen atmosphere, and adverse effects of water vapor and the like in the air on the heat treatment of the nanocrystalline strip are avoided.
S3, placing the nanocrystalline magnetic core into the annealing furnace after preheating is completed.
In the step S3, after the temperature of the annealing furnace reaches 150-250 ℃ and the air in the annealing furnace is driven out of the annealing furnace, the nanocrystalline magnetic core can be placed into the annealing furnace for heat treatment.
S4, performing pre-crystallization treatment on the nanocrystalline magnetic core, increasing the temperature in the annealing furnace, preserving heat, and circularly introducing oxygen with the content of omega 1 Is a mixed gas of oxygen and an inert gas.
In the step S4, the temperature in the annealing furnace is raised from 150-250 ℃ to 390-450 ℃ at a heating rate of 5-10 ℃/min to pre-crystallize the nano-crystals, and after the annealing furnace reaches the pre-crystallization temperature, the mixed gas of oxygen and inert gas is circularly introduced, wherein the oxygen content omega in the mixed gas 1 The value range of the nano-crystal is 10-20%, and the temperature is kept for 30-60min, so that oxygen gradually permeates between crystal blanks of the nano-crystal at high temperature, and further, the growth of the nano-crystal at high temperature is inhibited through the pinning effect of oxygen atoms, and further, crystal grains are refined.
Step S41 is further included after step S4, the temperature in the annealing furnace is raised to 470-510 ℃ from 390-450 ℃ at a heating rate of 3-5 ℃/min, and the temperature is kept for 45-90min. The temperature is raised in stages in the heat treatment process of the nanocrystalline magnetic core, so that oxygen can fully permeate between the crystal grains of the nanocrystalline and fully act with the crystal grains of the nanocrystalline.
S5, crystallizing the nanocrystalline magnetic core, increasing the temperature in the annealing furnace, preserving heat, and circularly introducing oxygen with the content of omega 2 Wherein omega is a mixture of oxygen and an inert gas 2 Greater than omega 1 。
In the step S5, the temperature in the annealing furnace is raised from 470-510 ℃ to 540-600 ℃ at a heating rate of 3-5 ℃/min to crystallize the nano-crystals, and after the annealing furnace reaches the crystallization temperature, the mixed gas of oxygen and inert gas is circularly introduced, wherein the oxygen content omega in the mixed gas 2 The value of (2) is 20-100% and omega 2 Greater than omega 1 And preserving heat for 120-240min to enable oxygen to form a layer of oxide film between nanocrystalline grains and improve the resistivity of the nanocrystalline magnetic core.
S6, cooling the nanocrystalline magnetic core to room temperature along with the furnace, and taking out the nanocrystalline magnetic core.
In step S6, after the nanocrystalline magnetic core is cooled to room temperature along with the annealing furnace, the nanocrystalline magnetic core is taken out of the annealing furnace, and the nanocrystalline strip subjected to heat treatment is obtained.
According to the heat treatment process of the nanocrystalline strip, the mixed gas of oxygen and inert gas is introduced in the pre-crystallization stage of the nanocrystalline strip, so that oxygen permeates between crystal blanks of the nanocrystalline at a high temperature, the growth of nanocrystalline grains is restrained due to the pinning effect of oxygen atoms, and a layer of oxide film is formed between the nanocrystalline grains by introducing the mixed gas with higher oxygen content in the crystallization stage of the nanocrystalline strip, so that the resistivity of the nanocrystalline strip is improved, the high-frequency loss of the nanocrystalline strip is reduced, and the use frequency of the nanocrystalline strip in wireless charging equipment is improved to 500kHz-1000kHz.
Example two
The second embodiment of the present invention differs from the first embodiment only in that: in step S4, the oxygen content omega in the mixed gas 1 10%; in step S5, the oxygen content ω in the mixed gas 2 25%.
The complex permeability and the quality factor of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process in the implementation at different frequencies and the complex permeability and the quality factor of the nanocrystalline strip obtained by the conventional heat treatment process (vacuum or inert gas atmosphere) at different frequencies are shown in table 1, wherein μ' represents the real part of the complex permeability of the nanocrystalline strip, μ″ represents the imaginary part of the complex permeability of the nanocrystalline strip, and Q represents the quality factor of the nanocrystalline strip.
Table 1 comparison of the properties of two nanocrystalline strips at different frequencies
Figure BDA0002900850560000061
As can be seen from the experimental data in table 1, the properties of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process of this example were superior to those of the nanocrystalline strip obtained by conventional heat treatment at various frequencies.
Example III
Embodiment III and embodiment of the inventionOne only differs in that: in step S4, the oxygen content omega in the mixed gas 1 15%; in step S5, the oxygen content ω in the mixed gas 2 25%.
The complex permeability and the quality factor of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process in the implementation at different frequencies and the complex permeability and the quality factor of the nanocrystalline strip obtained by the conventional heat treatment process (vacuum or inert gas atmosphere) at different frequencies are shown in table 2, wherein μ' represents the real part of the complex permeability of the nanocrystalline strip, μ″ represents the imaginary part of the complex permeability of the nanocrystalline strip, and Q represents the quality factor of the nanocrystalline strip.
Table 2 comparison of the properties of two nanocrystalline strips at different frequencies
Figure BDA0002900850560000062
As can be seen from the data in table 2, the properties of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process of this example were superior to those of the nanocrystalline strip obtained by conventional heat treatment at each frequency.
Example IV
The fourth embodiment of the present invention differs from the first embodiment only in that: in step S4, the oxygen content omega in the mixed gas 1 20%; in step S5, the oxygen content ω in the mixed gas 2 25%.
The complex permeability and quality factor of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process in this implementation at different frequencies and the complex permeability and quality factor of the nanocrystalline strip obtained by the conventional heat treatment process (vacuum or inert gas atmosphere) at different frequencies are shown in table 3, where μ' represents the real part of the complex permeability of the nanocrystalline strip, μ″ represents the imaginary part of the complex permeability of the nanocrystalline strip, and Q represents the quality factor of the nanocrystalline strip.
Table 3 comparison of the properties of two nanocrystalline strips at different frequencies
Figure BDA0002900850560000071
As can be seen from the data in table 3, the properties of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process of this example were superior to those of the nanocrystalline strip obtained by conventional heat treatment at each frequency.
Example five
The fifth embodiment of the present invention differs from the first embodiment only in that: in step S4, the oxygen content omega in the mixed gas 1 15%; in step S5, the oxygen content ω in the mixed gas 2 20%.
The complex permeability and quality factor of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process in this implementation at different frequencies and the complex permeability and quality factor of the nanocrystalline strip obtained by the conventional heat treatment process (vacuum or inert gas atmosphere) at different frequencies are shown in table 4, where μ' represents the real part of the complex permeability of the nanocrystalline strip, μ″ represents the imaginary part of the complex permeability of the nanocrystalline strip, and Q represents the quality factor of the nanocrystalline strip.
Table 4 comparison of the properties of two nanocrystalline strips at different frequencies
Figure BDA0002900850560000081
As can be seen from the data in table 4, the properties of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process of this example were superior to those of the nanocrystalline strip obtained by conventional heat treatment at each frequency.
Example six
The sixth embodiment of the present invention differs from the first embodiment only in that: in step S4, the oxygen content omega in the mixed gas 1 20%; in step S5, the oxygen content ω in the mixed gas 2 50%.
The complex permeability and quality factor of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process in this implementation at different frequencies and the complex permeability and quality factor of the nanocrystalline strip obtained by the conventional heat treatment process (vacuum or inert gas atmosphere) at different frequencies are shown in table 5, where μ' represents the real part of the complex permeability of the nanocrystalline strip, μ″ represents the imaginary part of the complex permeability of the nanocrystalline strip, and Q represents the quality factor of the nanocrystalline strip.
Table 5 comparison of the properties of two nanocrystalline strips at different frequencies
Figure BDA0002900850560000082
As can be seen from the data in table 5, the properties of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process of this example were superior to those of the nanocrystalline strip obtained by conventional heat treatment at each frequency.
Example seven
The seventh embodiment of the present invention differs from the first embodiment only in that: in step S4, the oxygen content omega in the mixed gas 1 20%; in step S5, the oxygen content ω in the mixed gas 2 60%.
The complex permeability and quality factor of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process in this implementation at different frequencies and the complex permeability and quality factor of the nanocrystalline strip obtained by the conventional heat treatment process (vacuum or inert gas atmosphere) at different frequencies are shown in table 6, where μ' represents the real part of the complex permeability of the nanocrystalline strip, μ″ represents the imaginary part of the complex permeability of the nanocrystalline strip, and Q represents the quality factor of the nanocrystalline strip.
Table 6 comparison of the properties of two nanocrystalline strips at different frequencies
Figure BDA0002900850560000091
As can be seen from the data in table 6, the properties of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process of this example were superior to those of the nanocrystalline strip obtained by conventional heat treatment at each frequency.
Example eight
The eighth embodiment of the present invention differs from the first embodiment only in that: in step S4, the oxygen content omega in the mixed gas 1 20%; in step S5, the oxygen content ω in the mixed gas 2 75%.
The complex permeability and quality factor of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process in this implementation at different frequencies and the complex permeability and quality factor of the nanocrystalline strip obtained by the conventional heat treatment process (vacuum or inert gas atmosphere) at different frequencies are shown in table 7, wherein μ' represents the real part of the complex permeability of the nanocrystalline strip, μ″ represents the imaginary part of the complex permeability of the nanocrystalline strip, and Q represents the quality factor of the nanocrystalline strip.
Table 7 comparison of the properties of two nanocrystalline strips at different frequencies
Figure BDA0002900850560000092
Figure BDA0002900850560000101
As can be seen from the data in table 7, the properties of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process of this example were superior to those of the nanocrystalline strip obtained by conventional heat treatment at each frequency.
Implement nine steps
Embodiment nine of the present invention differs from embodiment one only in that: in step S4, the oxygen content omega in the mixed gas 1 20%; in step S5, the oxygen content ω in the mixed gas 2 100%.
The complex permeability and quality factor of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process in this implementation at different frequencies and the complex permeability and quality factor of the nanocrystalline strip obtained by the conventional heat treatment process (vacuum or inert gas atmosphere) at different frequencies are shown in table 8, where μ' represents the real part of the complex permeability of the nanocrystalline strip, μ″ represents the imaginary part of the complex permeability of the nanocrystalline strip, and Q represents the quality factor of the nanocrystalline strip.
Table 8 comparison of the properties of two nanocrystalline strips at different frequencies
Figure BDA0002900850560000102
As can be seen from the data in table 8, the properties of the nanocrystalline strip obtained by the nanocrystalline strip heat treatment process of this example were superior to those of the nanocrystalline strip obtained by conventional heat treatment at each frequency.
In summary, the heat treatment process for the nanocrystalline strip provided by the invention improves the resistivity of the nanocrystalline strip, reduces the high-frequency loss of the nanocrystalline strip, enhances the high-frequency loss performance of the nanocrystalline strip, and improves the use frequency of the nanocrystalline strip in wireless charging equipment to 500kHz-1000kHz.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.

Claims (5)

1. A heat treatment process for a nanocrystalline strip is characterized in that: comprises the steps of,
obtaining a nanocrystalline strip, and winding the nanocrystalline strip into a ring shape to obtain a nanocrystalline magnetic core;
preheating an annealing furnace, heating the annealing furnace to 150-250 ℃, vacuumizing and introducing nitrogen;
placing the nanocrystalline magnetic core into the annealing furnace after preheating is completed;
pre-crystallizing the nanocrystalline magnetic core, increasing the temperature in the annealing furnace, preserving heat, increasing the temperature in the annealing furnace from 150-250 ℃ to 390-450 ℃ at a heating rate of 5-10 ℃/min, preserving heat for 30-60min, and simultaneouslyThe content of the circularly introduced oxygen is omega 1 A mixed gas of oxygen and an inert gas;
raising the temperature in the annealing furnace from 390-450 ℃ to 470-510 ℃ at a heating rate of 3-5 ℃/min, and preserving heat for 45-90min;
crystallizing the nanocrystalline magnetic core, increasing the temperature in the annealing furnace, preserving heat, increasing the temperature in the annealing furnace from 470-510 ℃ to 540-600 ℃ at a heating rate of 3-5 ℃/min, preserving heat for 120-240min, and simultaneously circularly introducing oxygen with the content of omega 2 Wherein omega is a mixture of oxygen and an inert gas 2 Greater than omega 1 ；
And cooling the nanocrystalline magnetic core to room temperature along with the furnace, and taking out the nanocrystalline magnetic core.
2. The nanocrystalline strip heat treatment process according to claim 1, wherein: the surface tension of the nanocrystalline magnetic core is 2-10N.
3. The nanocrystalline strip heat treatment process according to claim 1, wherein: the concentration of nitrogen introduced in the preheating process of the annealing furnace is 99.99%.
4. The nanocrystalline strip heat treatment process according to claim 1, wherein: omega 1 The range of the value of (2) is 10-20%.
5. The nanocrystalline strip heat treatment process according to claim 1, wherein: omega 2 The value range of (2) is 20-100%.
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