CN110205540A - A kind of processing method of the nano-crystal soft magnetic alloy of resistance to stress, alloy preparation method and iron core - Google Patents

A kind of processing method of the nano-crystal soft magnetic alloy of resistance to stress, alloy preparation method and iron core Download PDF

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CN110205540A
CN110205540A CN201910354428.9A CN201910354428A CN110205540A CN 110205540 A CN110205540 A CN 110205540A CN 201910354428 A CN201910354428 A CN 201910354428A CN 110205540 A CN110205540 A CN 110205540A
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iron core
nano
heat
soft magnetic
resistance
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安海路
梁学艺
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Tianjin Sanhuan Ona Technology Co Ltd
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    • 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
    • C21D1/04—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14766—Fe-Si based alloys

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electromagnetism (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

The present invention provides a kind of nano-crystal soft magnetic alloy of resistance to stress, alloy includes iron, silicon, boron, niobium, copper and mickel, the atomic ratio of each element are as follows: 67~80:10~15:5~8:4~7:0.5~1.5:0.5~1.5.In the present invention, the adjustment that the proportion of selection and content to each component is optimized, the effect for realizing refinement crystal grain, optimizing internal structure, the magnetostriction spring energy of material internal and heat treatment is set to generate the external carbuncle basic neutralisation that internal stress is subject to iron core by special thermal treatment technique again, to ensure that the stabilization of iron core performance.In actual use, iron core magnetic conductivity change rate when using under by external carbuncle environment can be made to be controlled within positive and negative 2%, even if iron core works under movement environment, stable performance is still able to maintain when being acted on by external carbuncle, makes electronic component the operation is stable.

Description

A kind of place of the nano-crystal soft magnetic alloy of resistance to stress, alloy preparation method and iron core Reason method
Technical field
The invention belongs to magnetically soft alloy technologiesField, it is related to a kind of nano-crystal soft magnetic alloy formula and preparation method, especially It is a kind of nano-crystal soft magnetic alloy and preparation method thereof of resistance to stress.
Background technique
Nano-crystal soft magnetic alloy refers to the soft magnetism of the nanocrystalline structure obtained on the basis of amorphous alloy by heat treatment The advantages that alloy, saturation induction density with higher, high magnetic permeability, low-loss, good temperature stability, be a kind of soft magnetism Green energy-saving products that can be more excellent just gradually replace silicon steel, the glass not conventional soft magnetic materials such as alloy and ferrite, in electricity The fields such as power, electronics, communication are got more and more applications.
Although nanocrystalline magnetically soft alloy material have the advantages that it is very much, its have one influence working condition weakness, it may be assumed that For magnetically soft alloy material in the case where being acted on by external carbuncle, performance will receive very big influence, or even disappear, such as: many application fields Middle needs wind thicker coil on iron core, these coils will make iron core by external carbuncle, thus become its performance sharply Change, magnetic conductivity change rate is even up to 50% or more, has severely impacted the normal work of electronic device.In recent years, nanocrystalline Magnetically soft alloy material has been widely used in automotive field, since iron core works under movement environment, so by Performance is extremely unstable under the action of to external carbuncle, causes automotive electronics component job insecurity, even can not be normal when serious Work.
In conclusion if can not effective solution external carbuncle effect the problem of, not can guarantee nano-crystal soft magnetic alloy material The job stability of material, and limit its application field and equipment.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide resistance to stress abilities by force, magnetic conductance change rate is low and first A kind of nano-crystal soft magnetic alloy of the high resistance to stress of beginning magnetic conductivity.
The technical solution adopted by the present invention is that:
A kind of nano-crystal soft magnetic alloy of resistance to stress, it is characterised in that: the alloy includes iron, silicon, boron, niobium, copper and mickel, The atomic ratio of each element are as follows: 67~80:10~15:5~8:4~7:0.5~1.5:0.5~1.5.
It is a further object to provide a kind of preparation method of the nano-crystal soft magnetic alloy of resistance to stress, including it is following Step:
(1) raw material is weighed according to the ratio, is put into melting in vaccum sensitive stove；
(2) the pouring molten steel that melting is completed is at alloy cast ingot；
(3) the product of step (2) being put into belt spraying machine and carry out secondary smelting, the molten steel that melting is completed injects tundish, then It is sprayed on copper roller by tundish and obtains nanocrystalline strip.
Further more, (1) the vaccum sensitive stove is vacuum medium frequency induction furnace to step, smelting temperature is 1300~1500 degrees Celsius, Smelting time is 2~4 hours, and the vacuum degree in induction furnace is 0.2~1Pa.
Further more, the method for the step (2) casting is: will be propped up in pouring molten steel to the rotary casting disk with cooling device Alloy cast ingot is supportted, the pressure of recirculated water is 0.1~0.2MPa in cooling device.
Further more, the smelting temperature of the step (3) secondary smelting is 1100~1300 degrees Celsius, when the melting of secondary smelting Between be 40~60 minutes.
Further more, (3) step carries out the pre-heat treatment before the tundish injects molten steel, preheating temperature is 1200~1300 Celsius Degree.
It is a further object to provide a kind of processing methods of iron core made from nano-crystal soft magnetic alloy, including with Lower step:
(1) iron core made of nanocrystalline strip is heat-treated；
(2) second is carried out under magnetic field to be heat-treated, it is cooling；
(3) third time heat treatment is carried out, and completion is handled after cooling.
Further more, the heat-treating methods of step (1) are: iron core being put into heat-treatment furnace, 450~490 is to slowly warm up to and takes the photograph Family name's degree keeps the temperature 3~5 hours.
Further more, (2) second of heat-treating methods are step: step is continuously heating to 520 after the completion of being (1) heat-treated~ 550 degrees Celsius, and be in iron core in the high-intensity magnetic field of 4000~5000GS and continue heat preservation 3~5 hours, then naturally cool to Room temperature.
Further more, (3) the third time heat-treating methods are step: the iron core being cooled to room temperature being made to be warming up to 450~500 Degree Celsius, it is air-cooled to room temperature after heat preservation 2~3 hours.
The advantages and positive effects of the present invention are:
In the present invention, the adjustment that the proportion of selection and content to each component is optimized, realize refinement crystal grain, Optimize the effect of internal structure, then generates the magnetostriction spring energy of material internal and heat treatment by special thermal treatment technique The external carbuncle basic neutralisation that internal stress and iron core are subject to, to ensure that the stabilization of iron core performance.In actual use, iron can be made Core under by external carbuncle environment use when magnetic conductivity change rate controlled within positive and negative 2%, even if iron core under movement environment into Row work is still able to maintain stable performance when being acted on by external carbuncle, makes electronic component the operation is stable.
Detailed description of the invention
Fig. 1 is dynamic hystersis loop figure of the invention；
Fig. 2 is hysteresis loop figure of the invention.
Specific embodiment
Below with reference to embodiment, the present invention is further described, following embodiments be it is illustrative, be not restrictive, It cannot be limited the scope of protection of the present invention with following embodiments.
A kind of nano-crystal soft magnetic alloy of resistance to stress, it is characterised in that: the alloy includes iron, silicon, boron, niobium, copper and mickel, The atomic ratio of each element are as follows: 67~80:10~15:5~8:4~7:0.5~1.5:0.5~1.5.
Above-mentioned nano-crystal soft magnetic alloy is Fe(67-80)Si(10-15)B(5-8)Nb(4-7)Cu(0.5-1.5)Ni(0.5-1.5)。
The preparation method of the nano-crystal soft magnetic alloy of above-mentioned resistance to stress the following steps are included:
(1) raw material is weighed according to the ratio, is put into melting in vaccum sensitive stove；
(2) the pouring molten steel that melting is completed is at alloy cast ingot；
(3) the product of step (2) is put into the crucible of belt spraying machine and carries out secondary smelting, the molten steel that melting is completed injects intermediate Packet, then be sprayed on copper roller by tundish and obtain nanocrystalline strip.
Wherein, (1) the vaccum sensitive stove is vacuum medium frequency induction furnace to step, and smelting temperature is 1300~1500 degrees Celsius, Smelting time is 2~4 hours, and the vacuum degree in induction furnace is 0.2~1Pa.The method of the step (2) casting is: molten steel is poured Infuse the rotary casting disk inner support alloy cast ingot with cooling device, in cooling device the pressure of recirculated water be 0.1~ 0.2MPa.The smelting temperature of the step (3) secondary smelting is 1100~1300 degrees Celsius, and the smelting time of secondary smelting is 40 ~60 minutes.(3) step carries out the pre-heat treatment before the tundish injects molten steel, preheating temperature is 1200~1300 degrees Celsius.Band The thickness of material is controlled by the distance between nozzle and copper roller, and general control is at 18~20 microns.
Iron core is made according to specification in the nano-crystal soft magnetic alloy band made, and the processing method of the iron core includes following step It is rapid:
(1) iron core made of nanocrystalline strip is heat-treated；
(2) second is carried out under magnetic field to be heat-treated, it is cooling；
(3) third time heat treatment is carried out, and completion is handled after cooling.
Wherein, the heat-treating methods of step (1) are: iron core being put into heat-treatment furnace, 450~490 is to slowly warm up to and takes the photograph Family name's degree keeps the temperature 3~5 hours.(2) second of heat-treating methods are step: step is continuously heating to after the completion of being (1) heat-treated 520~550 degrees Celsius, and be in iron core in the high-intensity magnetic field of 4000~5000GS and continue heat preservation 3~5 hours, it is then natural It is cooled to room temperature.(3) the third time heat-treating methods are step: so that the iron core being cooled to room temperature is warming up to 450~500 and take the photograph Family name's degree, it is air-cooled to room temperature after heat preservation 2~3 hours.
Embodiment 1
A kind of nano-crystal soft magnetic alloy of resistance to stress, the atomic ratio of each element are as follows: 67:10:5:4:0.5:0.5.
Band preparation method be the following steps are included:
(1) raw material is weighed according to the ratio, is put into melting in vacuum medium frequency induction furnace, and smelting temperature is 1300 degrees Celsius, when melting Between be 2 hours, vacuum degree in induction furnace is 0.2~1Pa.
Melting complete pouring molten steel arrive with cooling device rotary casting disk inner support alloy cast ingot, cooling device The pressure of interior recirculated water is 0.1~0.2MPa；
(3) the product of step (2) is put into the crucible of belt spraying machine and carries out secondary smelting, the smelting temperature of secondary smelting is 1100 degrees Celsius, the smelting time of secondary smelting is 40 minutes.The pre-heat treatment is carried out before tundish injection molten steel, preheating temperature is 1200 degrees Celsius.The molten steel that secondary smelting is completed injects tundish, then is sprayed on copper roller by tundish and obtains nanocrystalline strip, The distance between nozzle and copper roller are 18~20 microns.
Iron core is made according to specification in the nano-crystal soft magnetic alloy band made, and the processing method of the iron core includes following step It is rapid:
(1) iron core made of nanocrystalline strip is heat-treated, heat-treating methods are: iron core is put into heat-treatment furnace It is interior, 450 degrees Celsius are to slowly warm up to, keeps the temperature 3 hours.
(2) step is continuously heating to 520 degrees Celsius after the completion of being (1) heat-treated, and iron core is made to be in the strong of 4000~5000GS In magnetic field and continue heat preservation 3 hours, then cooled to room temperature.
(3) third time heat treatment is carried out, and third time heat-treating methods are: so that the iron core being cooled to room temperature is warming up to 450 and take the photograph Family name's degree, it is air-cooled to room temperature after heat preservation 2 hours.Completion is handled after cooling.
Embodiment 2
A kind of nano-crystal soft magnetic alloy of resistance to stress, the atomic ratio of each element are as follows: 80:15:8:7:1.5:1.5.
Band preparation method be the following steps are included:
(1) raw material is weighed according to the ratio, is put into melting in vacuum medium frequency induction furnace, and smelting temperature is 1500 degrees Celsius, when melting Between be 4 hours, vacuum degree in induction furnace is 0.2~1Pa.
Melting complete pouring molten steel arrive with cooling device rotary casting disk inner support alloy cast ingot, cooling device The pressure of interior recirculated water is 0.1~0.2MPa；
(3) the product of step (2) is put into the crucible of belt spraying machine and carries out secondary smelting, the smelting temperature of secondary smelting is 1300 degrees Celsius, the smelting time of secondary smelting is 60 minutes.The pre-heat treatment is carried out before tundish injection molten steel, preheating temperature is 1300 degrees Celsius.The molten steel that secondary smelting is completed injects tundish, then is sprayed on copper roller by tundish and obtains nanocrystalline strip, The distance between nozzle and copper roller are 18~20 microns.
Iron core is made according to specification in the nano-crystal soft magnetic alloy band made, and the processing method of the iron core includes following step It is rapid:
(1) iron core made of nanocrystalline strip is heat-treated, heat-treating methods are: iron core is put into heat-treatment furnace It is interior, 490 degrees Celsius are to slowly warm up to, keeps the temperature 5 hours.
(2) step is continuously heating to 550 degrees Celsius after the completion of being (1) heat-treated, and iron core is made to be in the strong of 4000~5000GS In magnetic field and continue heat preservation 5 hours, then cooled to room temperature.
(3) third time heat treatment is carried out, and third time heat-treating methods are: so that the iron core being cooled to room temperature is warming up to 500 and take the photograph Family name's degree, it is air-cooled to room temperature after heat preservation 3 hours.Completion is handled after cooling.
Embodiment 3
A kind of nano-crystal soft magnetic alloy of resistance to stress, the atomic ratio of each element are as follows: 75:13:6:5:1:1.
Band preparation method be the following steps are included:
(1) raw material is weighed according to the ratio, is put into melting in vacuum medium frequency induction furnace, and smelting temperature is 1400 degrees Celsius, when melting Between be 3 hours, vacuum degree in induction furnace is 0.2~1Pa.
Melting complete pouring molten steel arrive with cooling device rotary casting disk inner support alloy cast ingot, cooling device The pressure of interior recirculated water is 0.1~0.2MPa；
(3) the product of step (2) is put into the crucible of belt spraying machine and carries out secondary smelting, the smelting temperature of secondary smelting is 1200 degrees Celsius, the smelting time of secondary smelting is 50 minutes.The pre-heat treatment is carried out before tundish injection molten steel, preheating temperature is 1250 degrees Celsius.The molten steel that secondary smelting is completed injects tundish, then is sprayed on copper roller by tundish and obtains nanocrystalline strip, The distance between nozzle and copper roller are 18~20 microns.
Iron core is made according to specification in the nano-crystal soft magnetic alloy band made, and the processing method of the iron core includes following step It is rapid:
(1) iron core made of nanocrystalline strip is heat-treated, heat-treating methods are: iron core is put into heat-treatment furnace It is interior, 470 degrees Celsius are to slowly warm up to, keeps the temperature 4 hours.
(2) step is continuously heating to 530 degrees Celsius after the completion of being (1) heat-treated, and iron core is made to be in the strong of 4000~5000GS In magnetic field and continue heat preservation 4 hours, then cooled to room temperature.
(3) third time heat treatment is carried out, and third time heat-treating methods are: so that the iron core being cooled to room temperature is warming up to 480 and take the photograph Family name's degree, it is air-cooled to room temperature after heat preservation 2.5 hours.Completion is handled after cooling.
Treated iron core is particularly applicable in the common mode inductance magnetic core of tesla's electric vehicle, and specification isThe curve of dynamic hystersis loop and hysteresis loop is as shown in Figure 1, 2.
The parameter of iron core are as follows:
1. inductance Al:24-41 μ H@10KHz, 0.3V；μ: 2.6-4 ten thousand
2. the μ H@of inductance Al >=15 100KHz, 0.3V；μ > 1.9 ten thousand
3. Ps≤100W/kg@100K0.3T is lost；
(be put into 100K inductance variable quantity in frame and be less than ± 5%) 4. resistance to stress, it is various under the conditions of inductance measurement data such as Shown in table 1, test equipment is TH2816B (Al: inductance；The subsequent frequency of@, voltage are test condition；Inductance and effective magnetic The relationship of conductance μ e is linear relationship；):
Table 1: inductance variable quantity
Inductance and magnetic permeability mutually calculate formula:
AL × Le=4 × 3.14 × 10-9×ue×N2×Se
AL (H): Henry
Le (cm): the length of magnetic path
N: the number of turns
Se(cm2): effective sectional area
From above-mentioned formula it is found that inductance variable quantity=magnetic conductivity variable quantity.Test result is shown in Table 1, the change on last column Change amount=(inductance after inductance-deformation before deforming)/inductance before deforming, such as in the 1st row: magnetic conductance change rate=(21- 20.7) ÷ 21=1.4%, similarly it is available 1-10 test magnetic conductivity variable quantities≤2%.

Claims (10)

1. a kind of nano-crystal soft magnetic alloy of resistance to stress, it is characterised in that: the alloy includes iron, silicon, boron, niobium, copper and mickel, respectively The atomic ratio of element are as follows: 67~80:10~15:5~8:4~7:0.5~1.5:0.5~1.5.
2. a kind of preparation method of the nano-crystal soft magnetic alloy of resistance to stress according to claim 1, it is characterised in that: including Following steps:
(1) raw material is weighed according to the ratio, is put into melting in vaccum sensitive stove；
(2) the pouring molten steel that melting is completed is at alloy cast ingot；
(3) the product of step (2) is put into belt spraying machine and carries out secondary smelting, the molten steel that melting is completed injects tundish, then passes through Tundish is sprayed on copper roller and obtains nanocrystalline strip.
3. a kind of preparation method of the nano-crystal soft magnetic alloy of resistance to stress according to claim 2, it is characterised in that: step (1) the vaccum sensitive stove is vacuum medium frequency induction furnace, and smelting temperature is 1300~1500 degrees Celsius, and smelting time is 2~4 small When, the vacuum degree in induction furnace is 0.2~1Pa.
4. a kind of preparation method of the nano-crystal soft magnetic alloy of resistance to stress according to claim 2, it is characterised in that: step (2) the method for the casting is: by pouring molten steel to the rotary casting disk inner support alloy cast ingot for having cooling device, cooling dress The pressure for setting interior recirculated water is 0.1~0.2MPa.
5. a kind of preparation method of the nano-crystal soft magnetic alloy of resistance to stress according to claim 2, it is characterised in that: step (3) the smelting temperature of the secondary smelting is 1100~1300 degrees Celsius, and the smelting time of secondary smelting is 40~60 minutes.
6. a kind of preparation method of the nano-crystal soft magnetic alloy of resistance to stress according to claim 2, it is characterised in that: step (3) the pre-heat treatment is carried out before the tundish injection molten steel, preheating temperature is 1200~1300 degrees Celsius.
7. a kind of processing method of the iron core as made from claim 2~6 any one preparation method, it is characterised in that: packet Include following steps:
(1) iron core made of nanocrystalline strip is heat-treated；
(2) second is carried out under magnetic field to be heat-treated, it is cooling；
(3) third time heat treatment is carried out, and completion is handled after cooling.
8. the processing method of iron core according to claim 7, it is characterised in that: the heat-treating methods of step (1) are: will Iron core is put into heat-treatment furnace, is to slowly warm up to 450~490 degrees Celsius, keeps the temperature 3~5 hours.
9. a kind of preparation method of the nano-crystal soft magnetic alloy of resistance to stress according to claim 7, it is characterised in that: step (2) second of heat-treating methods are: step is continuously heating to 520~550 degrees Celsius after the completion of being (1) heat-treated, and makes iron Core is in the high-intensity magnetic field of 4000~5000GS and continues heat preservation 3~5 hours, then cooled to room temperature.
10. a kind of preparation method of the nano-crystal soft magnetic alloy of resistance to stress according to claim 7, it is characterised in that: step The rapid (3) described third time heat-treating methods are: so that the iron core being cooled to room temperature is warming up to 450~500 degrees Celsius, heat preservation 2~3 It is air-cooled to room temperature after hour.
CN201910354428.9A 2019-04-29 2019-04-29 A kind of processing method of the nano-crystal soft magnetic alloy of resistance to stress, alloy preparation method and iron core Pending CN110205540A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102363830A (en) * 2011-10-26 2012-02-29 青岛云路新能源科技有限公司 Heat treatment method for ultracrystalline magnetic core
CN104200945A (en) * 2014-07-30 2014-12-10 天津奥纳科技有限公司 Nanocrystalline magnetically soft alloy with constant magnetic conductivity, high saturation flux density and change rate of magnetic conductivity within one percent and manufacturing method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102363830A (en) * 2011-10-26 2012-02-29 青岛云路新能源科技有限公司 Heat treatment method for ultracrystalline magnetic core
CN104200945A (en) * 2014-07-30 2014-12-10 天津奥纳科技有限公司 Nanocrystalline magnetically soft alloy with constant magnetic conductivity, high saturation flux density and change rate of magnetic conductivity within one percent and manufacturing method thereof

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