CN1153228C - Amorphous alloy with increased operating induction - Google Patents

Amorphous alloy with increased operating induction Download PDF

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CN1153228C
CN1153228C CNB998045977A CN99804597A CN1153228C CN 1153228 C CN1153228 C CN 1153228C CN B998045977 A CNB998045977 A CN B998045977A CN 99804597 A CN99804597 A CN 99804597A CN 1153228 C CN1153228 C CN 1153228C
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temperature
core
iron core
annealing
metal alloys
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CN1300437A (en
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H・H・利伯曼
H·H·利伯曼
德克里斯托法洛
N·J·德克里斯托法洛
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METGRAS CO
Honeywell International Inc
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    • 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
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • 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
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15341—Preparation processes therefor
    • 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
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
    • H01F41/0226—Manufacturing of magnetic circuits made from strip(s) or ribbon(s) from amorphous ribbons

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Soft Magnetic Materials (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

A large magnetic amorphous metallic alloy core is annealed to minimize exciting power rather than core loss. The core has an exciting power less than 1 VA/kg when measured at 60 Hz and an operating induction of 1.40 to 1.45 Tesla, the measurement being carried out at ambient temperature. Such cores can be run at higher operating induction than those annealed to minimize core loss. The physical size of the transformer's magnetic components, including the core, is significantly reduced.

Description

Amorphous alloy with operating induction of enhancing
Related application
The application is the subsequent application that the name submitted on February 5th, 1997 is called No. 08/796011, the U.S. Patent application of " Amorphous Alloy WithIncreased Operating Induction ".
Background of invention
1. invention field
The present invention relates to the amorphousmetal transformer core of operating induction with enhancing; Specially refer to a kind of magnetic-field annealing technology of the operating induction that can significantly improve the high-power transformer iron core.
2. prior art is described
The soft magnetic characteristic of amorphousmetal transformer core alloy is that the annealing by proper temperature and time forms in magnetic field.One of purpose of annealing is the adverse effect that will reduce the residual stress that quick cooling produced relevant with the amorphous alloy manufacturing process.Another purpose is to determine " easy magnetizing axis " at the interior of articles that adopts annealing in process; Determine that just the object of can guaranteeing to anneal has the optimum magnetic orientation of low core loss and exciting power.It is in order to reduce the core loss of annealing object that in the past magnetic-field annealing is handled, for example described in the U.S. Pat 4116728.Except magnetic-field annealing, under tensile stress amorphous alloy being annealed also can reach the effect of improving soft magnetic characteristic, referring to U.S. Pat 4053331 and 4053332.The sample structure of tensile stress annealing is unalterable slat.It is unpractical adopting stress annealing when making large-scale amorphous alloy transformer core.
Core loss and exciting power that topmost two magnetic characteristics of transformer core are core materials.(just be magnetized by the action of a magnetic field) when the magnetive cord of annealed metal glass is subjected to encouraging, iron core can consume a certain amount of intake, and this loss can become heat inevitably.This energy consumption mainly is that the arrangement energy needed of all magnetic domains on magnetic direction of amorphousmetal alloy inside causes.The energy of this loss is called as core loss, can encircle the area that is surrounded at the B-H of a complete magnetization cycle period generation with this material and represent the quantitative of it.The unit of measurement commonly used of core loss is W/kg, its actual kg of material energy that consumed each second under given frequency, iron inductance grade and temperature conditions of having represented.
Core loss is relevant with the annealing process of amorphous metal alloys.In brief, core loss depends on that alloy itself is to owe annealing, and desirable annealing still was annealing.There is remaining quenching stress in the alloy of owing to anneal, needs extra energy in magnetization process, and can increase core loss and exciting power in the magnetization cyclic process.The alloy of crossing annealing can show maximum atom " bag " and/or can comprise crystalline phase, and its result can lose ductility and/or lower magnetic characteristic, and the resistance that increases for mobile magnetic domain can cause the core loss increase.The alloy of desirable annealing has a kind of good balance between ductility and magnetic characteristic.
The annealed condition that in iron core weight is 40 to 400 kilograms high-power transformer iron core, is difficult to reach desirable.The thermal mass of iron core is crossed senior general and hinder evenly heating in annealing process.Specifically, annealing appearred in the skin of large-scale iron core easily, and the inside of iron core be easy to generate owe annealing.Under such condition, transformer manufacturer is generally according to making the core loss minimum come iron core is annealed; It is maximum that but the operating induction of iron core can not reach.The typical core loss value that obtains according to this technology is less than 0.37W/kg (60Hz and 1.4T), and the scope of operating induction is 1.26 to 1.4 teslas.
Exciting power is the needed electric energy in magnetic field that produces sufficient intensity in order to obtain given inductance grade (B) in metal glass.Exciting power is directly proportional with the magnetic field (H) that needs, thereby also just is directly proportional with electric current in primary coil.The rich iron amorphous metal alloys of a kind of as cast condition has a B-H ring that shearing is arranged slightly.During annealing, as cast condition anisotropy and casting stress have been alleviated, and the B-H ring is compared with as cast condition annular shape and become more square and narrower, until reaching desirable annealing.When reaching annealing, B-H ring trend broadening, this is the result that strain tolerance reduces, and depends on the mistake annealing grade of existing crystalline phase.Therefore, along with the annealing process of given alloy is proceeded to desirable annealing and has been annealing again from owing annealing, first meeting reduces for the exciting power value of given magnetization grade, reaches an ideal (minimum) value then, after this can increase again.Yet the annealing conditions that produces exciting power ideal (minimum) value in amorphous metal alloys is not consistent with the condition that forms minimum core loss.Consequently, the amorphous metal alloys that is annealed to minimum core loss can not obtain desirable exciting power.
Should be noted that desirable annealing conditions is different for the amorphous alloy of heterogeneity and required various character.Therefore, " ideal " annealing is considered to be in usually at the annealing process that can reach optimum balance between the required property combination of given purposes.For the manufacturing of high-power transformer iron core, manufacturer need determine the alloy that is adopted is carried out the concrete time and the temperature of " ideal " annealing.
Summary of the invention
The invention provides a kind of method that in the high-power transformer that constitutes by the magnetic amorphous alloy, obtains maximum operating induction.Put it briefly, exactly the magnetic amorphous alloy is annealed, be used for increasing operating induction rather than reduce core loss.Method of the present invention can reduce exciting power, reduces the possibility that improves " thermal loss " that operating induction brought significantly.Utilize the operating induction that improves to reduce transformer core size and cost thereof significantly again.
Amazingly be, if with one than reducing longer penetration period (soak time) of required time of core loss to core annealing, the operating induction maximum of iron core.Put it briefly, this annealing process may further comprise the steps (a) and iron core is heated to a peak temperature applying under the condition in magnetic field; (b) in magnetic field, iron core is remained on next section of peak temperature ratio and reduce the penetration period of power loss required time to the youthful and the elderly 50%; And (c) according to iron core being cooled to than the low about 100 ℃ temperature of peak temperature from 0.1 to l0 ℃/minute cooling rate.
The present invention also provides a kind of large-scale magnetic amorphous metal alloys iron core, and when measuring according to the operating induction of 60Hz and 1.40 to 1.45 tesla's scopes, the exciting power of iron core is less than 1VA/kg.The present invention further provides a kind of ferromagnetic amorphous metals alloy-iron core, its power loss is less than about 0.25W/Kg.
The accompanying drawing summary
Just can understand the present invention and advantage thereof fully with reference to the following description and accompanying drawing, in the accompanying drawings:
Fig. 1 a represents the temperature funtion curve of core loss, the vertical bar laboratory sampling when this curve representation is carried out isochrone annealing in 2 hours with all temps in magnetic field and the relation of core loss;
Fig. 1 b is the temperature funtion curve of exciting power, the vertical bar laboratory sampling when this curve representation is carried out isochrone annealing in 2 hours with all temps in magnetic field and the relation of exciting power;
Fig. 2 a represents a kind of temperature funtion curve of core loss, the real transformer iron core when this curve representation is carried out isochrone annealing in 2 hours with all temps in magnetic field and the relation of core loss;
Fig. 2 b is the temperature funtion curve of exciting power, the real transformer iron core when this curve representation is carried out isochrone annealing in 2 hours with all temps in magnetic field and the relation of exciting power;
Fig. 3 is the inductance function curve of exciting power, the exciting power when this curve representation vertical bar sampling is annealed under three kinds of different conditions and the relation of inductance grade;
Fig. 4 is the probe temperature function curve of exciting power, and this curve representation is according to the probe temperature of the vertical bar sampling after three kinds of different condition annealing and the relation of exciting power;
Fig. 5 is the penetration period function curve of exciting power, the relation of this curve representation exciting power and transformer core penetration period;
Fig. 6 is the inductance function curve of exciting power, this curve representation real transformer iron core exciting power during with the annealing of different penetration period and relation of inductance grade in magnetic field.
Detailed Description Of The Invention
The term of Cai Yonging " amorphous metal alloys " is meant a kind of like this metal alloy herein, it is basically without any long scope order (order) and have the characteristic of X one ray diffraction intensity maximum, and its character is similar to observed situation in liquid or the inorganic oxide glass.
The term of Cai Yonging " bar " is meant a kind of meagre object herein, and its cross dimension is more much smaller than its length.This comprises the lead with rule or irregular section, ribbon and thin slice.
The term " annealing " that uses in the whole text in specification and claims is meant a kind of material of heating under magnetic field environment, for example is for transferring heat energy, thereby obtains useful characteristic.Can adopt various annealing technologies in order to obtain these characteristics.
The term of Cai Yonging " vertical bar " is meant the structure of a kind of sampling that is used for measuring magnetic characteristic herein.The sampling of tested person can be a vertical bar purely, and in this case, its length is far longer than the length of magnetic field/inductance coil.Or, if the material of tested person is the 4th supporting leg in the simple transformer core, can also adopt a kind of more desirable sample length.No matter under what kind of situation, the material of tested person all is a vertical bar.
The term of Cai Yonging " big magnetive cord " is meant the magnetic part of a kind of weight range that can use from 40 to 400kg in electric equipment and device herein.Magnetive cord normally constitutes with magnetic strips or powder.
The term of Cai Yonging " peak temperature " is meant the maximum temperature that arbitrary position of transformer core is reached in anneal cycles herein.
The term of Cai Yonging " penetration period " is meant that in fact iron core is in the time period of annealing temperature herein, and this does not wherein comprise the iron core heating and cooling time.
The term of Cai Yonging " pulsactor " is meant with the transformer fe core material with " operating induction " and operates two kinds of relevant magnetoelectricity sense grades herein.Pulsactor is the maximum of the obtained inductance in the material.Magnetoelectricity sensibility reciprocal value when operating induction is the operation of transformer core.The pulsactor of amorphous metal alloys is determined by the chemical property of alloy and temperature.Pulsactor descends along with the increase of temperature.
The operating induction of magnetic material is determined by pulsactor.For the operation magnetic strength grade of design of transformer less than its pulsactor.The main cause that this design needs is the permeability (μ) of magnetive cord material.Permeability is defined as the ratio in magnetic strength (B) magnetic field (H) required with driving this material production magnetic strength; μ=B/H just.Permeability drops to the level near pulsactor along with the increase of magnetic strength.If, just needing an out-of-proportion big magnetic field too near the pulsactor of core material, the magnetic strength of transformer core work could obtain extra magnetic strength.In transformer, magnetic field is to be produced by the electric current by primary coil.Therefore, increase required magnetic field greatly and just need increase electric current greatly by primary coil.
For many-sided reason, it is undesirable increasing the transformer primary current greatly.Big electric current variation by single transformer can make the power supply quality by adjacent power network occur worsening.The increase of primary current also can cause the joule (I of primary coil inner heat 2R) increase.This energy loss changes into heat, and the efficient of transformer is reduced.In addition, excessive electric current can make primary coil overheated, thereby in essence deterioration and fault appear in the electric insulation that causes coil inside to be used.The electric insulation fault can directly cause the fault of transformer.Primary coil heating also can make the magnetive cord heating of transformer.
The The above results that causes the transformer magnetive cord to generate heat can cause the state of a kind of being called as " heat leakage ".Along with the increase of magnetive cord temperature, the pulsactor of magnetic material can descend.For the transformer according to fixing operating induction work, effect and the extra effect that increases operating induction that the pulsactor decline that heating causes is produced are the same.Extra electric current will pass through primary coil, produces extra Joule heat.The temperature of transformer magnetive cord further increases, and more aggravates saturated.This uncontrollable increase relevant with " heat leakage " of transformer temperature is another common cause that transformer core breaks down in magnetic field.
For fear of these adverse conditions occurring, transformer is design so often, that is: make the operating induction of iron core under standard state be not greater than core material pulsactor about 80 to 90%.
The present invention can increase operating induction and reduce exciting power for the large-scale magnetive cord that is made of amorphous metal alloys provides a kind of method for annealing, can not cause heat leakage again simultaneously.Should improve the inductance grade of large-scale magnetive cord in operation as far as possible, so just can dwindle the cross section of iron core.That is to say that the work of transformer core is to determine according to the quantity of magnetic flux line rather than magnetic flux density (inductance).If increase the operation magnetic flux density, just can use smaller magnetive cord cross section, keep given magnetic flux equally.Thus obtained clear superiority is to produce the littler magnetive cord of size for the transformer of given rated value.
As mentioned above, to the optimum annealing temperature and time of the amorphous metal alloys used at present in the transformer manufacturing industry should be, temperature range should be than low 140 ℃-100 ℃ of the crystallization temperature of alloy, and the time cycle scope of minimum core loss is 1.5-2.5 hour.
Fig. 1 a represents METLAS The sampling of the vertical bar of alloy 2605SA-1 is through the magnetive cord loss after the annealing in 2 hours and the relation curve of annealing temperature.At the low temperature place, because annealing is not enough, the core loss height causes the uncertain of easy magnetizing axis.In contrast, at the high temperature place, because amorphous metal alloys begins crystallization, the core loss height.The minimum core loss of vertical bar sampling appears at about 360 ℃ and locates.Fig. 1 b represents METLAS The sampling of the vertical bar of alloy 2605SA-1 is through the exciting power after the annealing in 2 hours and the relation curve of annealing temperature.In this case, the best (minimum) exciting power of annealing after 2 hours appears at about 375 ℃ and locates.This difference of optimum temperature is very tangible, because existing technology and patent documentation have all only illustrated the situation that noncrystal technology alloy is annealed to best core loss, and the failure cause of transformer core is high exciting power.
The data of Fig. 2 a and 2b are similar with 1b to Fig. 1 a, only are fit to the magnetive cord of power transformer.Also can obtain the vertical bar sampling obvious advantage when the high annealing for this magnetive cord.This has just proved versatility of the present invention.
Effect of the present invention has been described in Fig. 3 in another way.Fig. 3 represents the exciting power after vertical bar sampling is according to the temperature and time annealing of indicating among the figure and the relation curve of inductance grade.High annealing has tangible advantage.For example, if selected given exciting power, the operating induction of the sampling of process high annealing is than higher.The data of Fig. 3 show can make operating induction improve 5%.
Fig. 4 can illustrate the further advantage of the present invention, and it has represented the exciting power of vertical bar sampling and the relation curve of sampling and testing temperature.As can be seen from Figure 4, probe temperature is high more, and the advantage that the present invention obtained is just big more.This point is very important, because the operating temperature of transformer is than ambient temperature height, and might reach higher temperature when entering overload state.Therefore, technology of the present invention has especially effectively meaning.
Annealing is a kind of time/temperature course.Fig. 5 is illustrated in the relation curve of exciting power and " penetration period " in the magnetive cord annealing process.As seen from the figure, exciting power descends along with the increase of penetration period.This point explanation, as long as select to use anneal cycles penetration period or temperature, just can practical application method of the present invention.Fig. 3 represents with the magnetive cord exciting power of the iron core after the different penetration period annealing and the relation of inductance with Fig. 6.
Example 1
With chemical composition is Fe 80B 11Si 96.7 " wide METGLAS Alloy SA-1 makes 16 single-phase winding magnetive cords that are used for commercial distribution transformer.The weight of each iron core approximately is 75kg.These 16 iron cores are divided into four groups, with 355 ℃ each group are annealed according to different penetration periods.The baseline annealing penetration period that reaches minimum core loss approximately is 20 minutes.Anneal according to 30,40 and 60 minutes penetration period respectively for other three groups, respectively penetration period is increased by 50%, 100% and 150%.In Fig. 5 and 6, represented the result that all these iron cores obtained.Increase penetration period each time, exciting power all significantly decreases.Find also that in addition prolonging penetration period can reduce exciting power.
Example 2
With chemical composition is Fe 80B 11Si 96.7 " wide METGLAS Alloy SA-1 makes three single-phase winding magnetive cords that are used for commercial distribution transformer.The weight of each iron core approximately is 118kg, and notes reducing thermal gradients during heating and cooling as far as possible.According to 20 minutes penetration periods these iron cores are annealed, the peak temperature of employing is about 370 ℃ rather than common 355 ℃ of adopting.Measure these exciting power that iron core obtained and core losss through high annealings, compare according to the iron core of conventional process annealing respectively with among Fig. 2 a and the 2b.Therefrom as can be seen, if be increased in the peak temperature that uses in the core annealing process, exciting power will descend significantly, and core loss only is that increase is arranged slightly.Similar in the result that peak temperature reached by improving annealing in the example 2 and the example 1 by prolonging the effect that the penetration period of annealing produces.
Example 3
With chemical composition is Fe 80B 11Si 96.7 " wide METGLAS Alloy SA-1 makes the sampling of vertical bar laboratory.In magnetic field environment, 2 hours isochrones of straight line sampling execution are annealed according to various temperature.Measure exciting power and core loss that these vertical bar laboratory samplings are obtained, represent with the temperature funtion of Fig. 1 a and 1b.Therefrom as can be seen, if the peak temperature of annealing increases by 5 ℃ at least, exciting power will descend significantly.
Example 4
With chemical composition is Fe 80B 11Si 96.7 " wide METGLAS Alloy SA-1 makes the sampling of vertical bar laboratory.In magnetic field environment, 2 hours isochrones of vertical bar sampling execution are annealed according to various temperature.Fig. 4 represents the annealed exciting power of measuring at indicated temperature afterwards.Its result shows, is being higher than under the higher transformer core operating temperature of room temperature, and exciting power also can further descend.
Details of the present invention above has been described fully, it is to be noted, these details are not limitation of the present invention, and those skilled in the art can also propose various modifications and changes to this, the scope of the present invention that these modifications and changes all belong to claims and limited.

Claims (8)

1, a kind of amorphous metal alloys magnetive cord, its basic comprising composition is the boron of 11 atom % and the silicon of 9 atom %, surplus is iron and subsidiary impurity, when when measuring according to the operating induction of 60Hz and 1.40 to 1.45 teslas, this iron core has the exciting power less than 1VA/kg, and this measurement is at room temperature carried out.
2, magnetive cord as claimed in claim 1, this iron core has the loss less than 0.25W/kg.
3, a kind of method of making amorphous metal alloys magnetive cord as claimed in claim 1 is characterized in that, described iron core is accepted annealing, so that its exciting power reaches minimum.
4, a kind of method that amorphous metal alloys magnetive cord as claimed in claim 1 is annealed, this method may further comprise the steps:
A. apply under the condition in magnetic field one of existence, above-mentioned iron core is heated to peak temperature;
B. exist under the condition in this magnetic field, this iron core is remained on this peak temperature assign one section ratio and reduce the temperature retention time of required time of this core loss as far as possible to the youthful and the elderly 50%;
C. according to from 0.1-10 ℃/minute cooling rate, this iron core is cooled to a temperature than low 100 ℃ of this peak temperature.
5, the method that the amorphous metal alloys magnetive cord is annealed as claimed in claim 4 is characterized in that, the temperature retention time of this maintenance step is grown to and lacked 100% than reduce the required time of this core loss as far as possible.
6, the method for annealing to the amorphous metal alloys magnetive cord as claimed in claim 4 is characterized in that, the temperature retention time of this maintenance step is grown to and lacked 150% than reduce the required time of this core loss as far as possible.
7, a kind of method that amorphous metal alloys magnetive cord as claimed in claim 1 is annealed, this method may further comprise the steps:
A. apply under the condition in magnetic field one of existence, this iron core is heated to the peak temperature that a ratio reduces at least 5 ℃ of the required temperature height of this core loss as far as possible;
B. under the condition that has this magnetic field, above-mentioned iron core is remained on this peak temperature reach a temperature retention time;
C. according to from 0.1-10 ℃/minute cooling rate, this iron core is cooled to a temperature than low 100 ℃ of this peak temperature.
8, the method that the amorphous metal alloys magnetive cord is annealed as claimed in claim 7 is characterized in that, this peak temperature is than reduce at least 15 ℃ of the required temperature height of this core loss as far as possible.
CNB998045977A 1998-02-04 1999-02-04 Amorphous alloy with increased operating induction Expired - Fee Related CN1153228C (en)

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US4298409A (en) * 1979-12-10 1981-11-03 Allied Chemical Corporation Method for making iron-metalloid amorphous alloys for electromagnetic devices
EP0055327B2 (en) * 1980-12-29 1990-09-26 Allied Corporation Amorphous metal alloys having enhanced ac magnetic properties
BR9105953A (en) * 1990-02-13 1992-10-13 Allied Signal Inc AMORFA METAL ALLOY ESSENTIALLY CONSISTING OF IRON, BORON AND SILICON
EP0675970B1 (en) * 1992-12-23 2000-08-23 AlliedSignal Inc. AMORPHOUS Fe-B-Si-C ALLOYS HAVING SOFT MAGNETIC CHARACTERISTICS USEFUL IN LOW FREQUENCY APPLICATIONS
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