CN109238878A - A method of improving metallic fiber magnetic field sensitivity - Google Patents
A method of improving metallic fiber magnetic field sensitivity Download PDFInfo
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- CN109238878A CN109238878A CN201811053651.1A CN201811053651A CN109238878A CN 109238878 A CN109238878 A CN 109238878A CN 201811053651 A CN201811053651 A CN 201811053651A CN 109238878 A CN109238878 A CN 109238878A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/28—Investigating ductility, e.g. suitability of sheet metal for deep-drawing or spinning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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Abstract
The present invention provides a kind of method of magnetic field sensitivity for improving metallic fiber, belongs to magnetic metal fiber technical field.The method for improving the magnetic field sensitivity of metallic fiber, the tensile stress-strain curve for including the following steps: (1), testing metallic fiber.(2), the yield strength and breaking strength of metallic fiber are determined according to strain curve.(3), selection is greater than yield strength, and the constant stress less than breaking strength stretches metallic fiber.The method can effectively improve the magnetic field sensitivity of metallic fiber.
Description
Technical field
The present invention relates to magnetic metal fiber technical fields, in particular to a kind of raising metallic fiber magnetic field sensitive
The method of degree.
Background technique
Japanese gross profit in 1992 et al. discovery, in the case where stablizing alternating current excitation, the voltage value at wire both ends is with straight
Flow the variation in magnetic field and sensitive variation, i.e., with D.C. magnetic field, sensitive variation, maximum resistance variation rate reach 75% for its impedance, this
One phenomenon is referred to as giant magnetic impedance (GMI) effect.Then had also discovered in the soft magnetic materials such as soft magnetic ribbon, film, multilayer film
This phenomenon.But there are crossed-field effects in ribbon samples, so that its Effective permeability and GMI effect are relatively low；In addition its
Tangential anisotropy field is larger, causes the corresponding D.C. magnetic field of GMI effect peak value big, the magnetic responsiveness for reducing impedance is sensitive
Degree.Compared with ribbon sample, wire sample has better mechanical performance, and axially symmetric structure is with bigger GMI
Effect, therefore potentiality are had more in practical applications.
Magnetoimpedance test can be represented simply as such as Fig. 1, and the alternating current I of certain frequency is led in wireac, apply simultaneously
With its axial parallel D.C. magnetic field Hex, when changes of magnetic field, it can be observed that the voltage value corresponding change at wire both ends, impedance
Value can be obtained by calculating voltage with alternating current Amplitude Ration.Obviously, the circumferential direction for the certain frequency that wire is generated in alternating current
Magnetic field HΦWith external dc steady magnetic field HexUnder collective effect, dynamic magnetization, the i.e. complicated magnetization of GMI effect and wire occurs
Process is closely related.
For Co Base Metal silk, since shell has circumferential farmland, in GMI test, the toroidal field of ac-excited generation is more
It is easy to magnetize shell farmland circumferential direction, generates big circumferential magnetic conductivity, therefore, help to obtain big GMI effect.
GMI effect power is characterized, impedance rate of change Δ Z/Z is commonly defined as:
Δ Z/Z (%)=[Z (Hex)-Z(H0)]/Z(H0) × 100% (1)
Wherein, Z (Hex)、Z(H0) it is respectively magnetic field Hex, 0 when impedance value.
(1) formula can intuitively show magnetic material impedance with the variation of applying dc magnetic field.
When being related to the practical application of GMI effect, often compare the rate of change of magnetic of GMI simultaneously when using (1), and
Sensitivity S:
The general magnetic field sensitivity that wire is improved using the method made annealing treatment in the prior art.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of magnetic field sensitivity for improving metallic fiber, can effectively improve gold
Belong to the magnetic field sensitivity of fiber.
Based on above-mentioned first purpose, the present invention adopts the following technical solutions is realized:
A method of metallic fiber magnetic field sensitivity is improved, is included the following steps:
(1), the tensile stress-strain curve of metallic fiber is tested；
(2), the yield strength and breaking strength of metallic fiber are determined according to strain curve；
(3), selection is greater than yield strength, and the constant stress less than breaking strength stretches metallic fiber.
Further, in preferred embodiments of the present invention, above-mentioned constant stress is 0.3-0.6 times of breaking strength.
Further, in preferred embodiments of the present invention, the diameter of above-mentioned metallic fiber is 20-80 μm, constant stress
Stretching time is 0.5-2min.
Further, in preferred embodiments of the present invention, when the diameter of above-mentioned metallic fiber is 20-40 μm, constant stress
It is 0.5-0.6 times of breaking strength.
Further, in preferred embodiments of the present invention, the stretching time of above-mentioned constant stress is 0.5-1min.
Further, in preferred embodiments of the present invention, when the diameter of above-mentioned metallic fiber is 40-60 μm, constant stress
It is 0.4-0.5 times of breaking strength.
Further, in preferred embodiments of the present invention, the stretching time of above-mentioned constant stress is 1-1.5min.
Further, in preferred embodiments of the present invention, when the diameter of above-mentioned metallic fiber is 60-80 μm, constant stress
It is 0.3-0.4 times of breaking strength.
Further, in preferred embodiments of the present invention, the stretching time of above-mentioned constant stress is 1.5-2min.
Further, in preferred embodiments of the present invention, the above-mentioned drawing using universal testing machine test metallic fiber
Stretch load-deformation curve.
Compared with prior art, the method for the magnetic field sensitivity for the raising metallic fiber that presently preferred embodiments of the present invention provides
Beneficial effect include:
The power mind load-deformation curve for first testing metallic fiber just can determine bending for metallic fiber according to strain curve
Intensity and breaking strength are taken, selection is greater than yield strength, and the constant stress less than breaking strength stretches metallic fiber, constant stress
It is moderate, metallic fiber can be made to have certain deformation, and after stretching completion, the deformation of metallic fiber will not be made to restore, meanwhile,
Also it can be avoided metallic fiber to be broken during stretching.After stretching fiber using constant stress, metallic fiber internal stress
Increase, the domain structure and soft magnet performance of metallic fiber all change, and corresponding giant magnetoresistance effect substantially improves, Neng Gouyou
Effect increases the magnetic field sensitivity of metallic fiber.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings and also belong to protection scope of the present invention.
Fig. 1 is wire magnetoimpedance test schematic diagram；
Fig. 2 is the tensile stress-strain curve for the Co Base Metal fiber that diameter is 54 μm.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
The method of the raising metallic fiber magnetic field sensitivity of the embodiment of the present invention is specifically described below.
The method for improving metallic fiber magnetic field sensitivity, includes the following steps:
(1), the tensile stress-strain curve for testing metallic fiber, determines metallic fiber according to strain curve so as to subsequent
Yield strength and breaking strength.
Method particularly includes: according to ASTMD3379-75 international standard preparing experiment sample, cuts be about 10cm first, it is wide
A regular square hole, a length of 5cm in hole, the single piece of metal for being then 7cm by length are cut off in the flexible cardboard of about 1cm, centre
Silk is put among cardboard, and the both ends of wire are sticked on paper with 502 glue, the use of equipment is the omnipotent material of Instron5500 type
Expect testing machine, the contact area of microfilament and fixture when stretching to increase selects plate jig, and tens(i)ometer selected range is 10N's
Sensor, sample standard are 5cm, and rate of extension 5mm/min finally obtains the tensile stress-strain curve of metallic fiber.
Optionally, metallic fiber can be Co based non-crystalline metal silk or Fe based non-crystalline metal silk, that is, based on Co
It wants the base amorphous fiber of the Co of element and Fe is the base amorphous fiber of Fe of essential element.It should be understood that metallic fiber is also
It can be Co base, Fe base film, strip or magnetic membrane material etc..
(2), the yield strength and breaking strength of metallic fiber are determined according to strain curve.Test specific length, specific
The tensile stress-strain curve of the metallic fiber of diameter can immediately arrive at bending for the wire according to load-deformation curve
Take intensity and breaking strength.
In detail, the yield strength and breaking strength of wire are related with the diameter of the type of wire and wire.No
After the wire of congener wire and different-diameter carries out the tensile stress-strain curve of test metallic fiber, obtain
Different load-deformation curve, to obtain the yield strength and fracture of wire by the observation of load-deformation curve
Intensity.
(3), selection is greater than yield strength, and the constant stress less than breaking strength stretches metallic fiber.Constant stress is moderate,
Metallic fiber can be made to have certain deformation, and after stretching completion, the deformation of metallic fiber will not be made to restore, meanwhile, also can
Enough metallic fiber is avoided to be broken during stretching.
Constant stress is less than or equal to yield strength, then after stretched wire, after wire cannot be deformed or be deformed,
After cancelling constant stress, the shape that wire stretches cannot retain, and can be reduced into non-stretched shape, can not effectively increase
Add the magnetic field sensitivity of metallic fiber.
If constant stress is more than or equal to breaking strength, during stretched wire, wire can be broken, and be risen
Less than the effect for the magnetic field sensitivity for increasing metallic fiber.
Optionally, constant stress is 0.3-0.6 times of breaking strength.Make wire under the action of above-mentioned constant stress
After stretching, wire has biggish deformation, and wire will not be made to attenuate since deformation is excessive, and the diameter of wire will not
It changes, further, it is possible to preferably increase the magnetic field sensitivity of metallic fiber.
Further, if the diameter of metallic fiber is 20-80 μm, the stretching time of constant stress is 0.5-2min.It draws
It is suitable to stretch the time, will not generate huge deformation or obvious deformation defect, and can play the magnetic field sensitive for increasing metallic fiber
The effect of degree.
Optionally, when the diameter of metallic fiber is 20-40 μm, constant stress is 0.5-0.6 times of breaking strength, constant
The stretching time of stress is 0.5-1min.
When the diameter of metallic fiber is 40-60 μm, constant stress is 0.4-0.5 times of breaking strength, constant stress
Stretching time is 1-1.5min.
When the diameter of metallic fiber is 60-80 μm, constant stress is 0.3-0.4 times of breaking strength, constant stress
Stretching time is 1.5-2min.
It should be understood that metallic fiber can be Co Base Metal fiber or Fe Base Metal fiber, in each diameter range
Metallic fiber, the stretching of different time is carried out using different constant stress, to increase the magnetic field sensitivity of metallic fiber.
Embodiment 1
The method for improving metallic fiber magnetic field sensitivity includes the following steps: that the stretching of (1), test metallic fiber is answered
Force-strain curve.(2), the yield strength and breaking strength of metallic fiber are determined according to strain curve.(3), selection, which is greater than, bends
Intensity is taken, the constant stress less than breaking strength stretches metallic fiber.
Embodiment 2
The method for improving metallic fiber magnetic field sensitivity includes the following steps: that the stretching of (1), test metallic fiber is answered
Force-strain curve.(2), the yield strength and breaking strength of metallic fiber are determined according to strain curve.(3), selection, which is greater than, bends
Take intensity, less than breaking strength and be breaking strength 0.3 times of constant stress stretch metallic fiber.
Embodiment 3
The method for improving metallic fiber magnetic field sensitivity includes the following steps: (1), the Co fund that test diameter is 20 μm
Belong to the tensile stress-strain curve of fiber.(2), the yield strength and breaking strength of metallic fiber are determined according to strain curve.
(3), selection be greater than yield strength, less than breaking strength and be breaking strength 0.6 times of constant stress stretch 0.5min metal
Fiber.
Embodiment 4
The method for improving metallic fiber magnetic field sensitivity includes the following steps: (1), the Fe fund that test diameter is 40 μm
Belong to the tensile stress-strain curve of fiber.(2), the yield strength and breaking strength of metallic fiber are determined according to strain curve.
(3), selection is greater than yield strength, less than breaking strength and is that stretch 1min metal fine for 0.5 times of constant stress of breaking strength
Dimension.
Embodiment 5
The method for improving metallic fiber magnetic field sensitivity includes the following steps: (1), the Co fund that test diameter is 60 μm
Belong to the tensile stress-strain curve of fiber.(2), the yield strength and breaking strength of metallic fiber are determined according to strain curve.
(3), selection be greater than yield strength, less than breaking strength and be breaking strength 0.4 times of constant stress stretch 1.5min metal
Fiber.
Embodiment 6
The method for improving metallic fiber magnetic field sensitivity includes the following steps: (1), the Co fund that test diameter is 80 μm
Belong to the tensile stress-strain curve of fiber.(2), the yield strength and breaking strength of metallic fiber are determined according to strain curve.
(3), selection is greater than yield strength, less than breaking strength and is that stretch 2min metal fine for 0.3 times of constant stress of breaking strength
Dimension.
Experimental example 1
According to the tensile stress-strain curve such as Fig. 2 for the Co Base Metal fiber that GB standard test diameter is 54 μm.It is logical
Load-deformation curve shown in Fig. 2 is crossed, determines that diameter is that the yield strength of 54 μm of Co Base Metal fiber is about respectively
700Mpa, breaking strength are about 1600Mpa, and the sensitivity not stretched is 5420V/T.
It is respectively 480Mpa, 700Mpa, 750Mpa, 800Mpa, 960Mpa, 1200Mpa or 1600Mpa drawing with constant stress
Stretch metallic fiber 0.8min, 1min, 1.2min, 1.5min or 1.8min, the magnetic field sensitivity of the metallic fiber after measurement stretching
Such as table 1:
Magnetic field sensitivity (V/T) after the Co Base Metal fiber stretching that 1 diameter of table is 54 μm
As it can be seen from table 1 the Co Base Metal fiber that diameter is 54 μm is when tensile stress is 700-800Mpa, stretches
Between under conditions of 1-1.5min, magnetic field sensitivity is significantly improved.
Embodiments described above is a part of the embodiment of the present invention, instead of all the embodiments.Reality of the invention
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
Claims (10)
1. a kind of method for the magnetic field sensitivity for improving metallic fiber, which comprises the steps of:
(1), the tensile stress-strain curve of metallic fiber is tested；
(2), the yield strength and breaking strength of the metallic fiber are determined according to the strain curve；
(3), selection is greater than yield strength, stretches the metallic fiber less than the constant stress of breaking strength.
2. the method according to claim 1, wherein the constant stress is the 0.3-0.6 of the breaking strength
Times.
3. according to the method described in claim 2, it is characterized in that, the diameter of the metallic fiber be 20-80 μm, the perseverance
The stretching time for determining stress is 0.5-2min.
4. according to the method described in claim 3, it is characterized in that, the diameter of the metallic fiber be 20-40 μm when, it is described
Constant stress is 0.5-0.6 times of the breaking strength.
5. according to the method described in claim 4, it is characterized in that, the stretching time of the constant stress is 0.5-1min.
6. according to the method described in claim 3, it is characterized in that, the diameter of the metallic fiber be 40-60 μm when, it is described
Constant stress is 0.4-0.5 times of the breaking strength.
7. according to the method described in claim 6, it is characterized in that, the stretching time of the constant stress is 1-1.5min.
8. according to the method described in claim 3, it is characterized in that, the diameter of the metallic fiber be 60-80 μm when, it is described
Constant stress is 0.3-0.4 times of the breaking strength.
9. according to the method described in claim 8, it is characterized in that, the stretching time of the constant stress is 1.5-2min.
10. -9 described in any item methods according to claim 1, which is characterized in that test metal using universal testing machine
The tensile stress-strain curve of fiber.
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| CN201811053651.1A CN109238878A (en) | 2018-09-10 | 2018-09-10 | A method of improving metallic fiber magnetic field sensitivity |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1076243A2 (en) * | 1999-08-09 | 2001-02-14 | Alps Electric Co., Ltd. | Magneto-impedance effect element and method of manufacturing the same |
| CN101200792A (en) * | 2006-12-15 | 2008-06-18 | 北京国浩微磁电子智能传感器技术研究所 | Magneto-elastic amorphous wire material and magnetoelastic displacement transducer |
| CN101236817A (en) * | 2007-12-21 | 2008-08-06 | 安泰科技股份有限公司 | Magnetic sensitive material and its making method |
| CN103107282A (en) * | 2013-02-05 | 2013-05-15 | 兰州大学 | Method for improving giant magneto-impedance effect of materials |
-
2018
- 2018-09-10 CN CN201811053651.1A patent/CN109238878A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1076243A2 (en) * | 1999-08-09 | 2001-02-14 | Alps Electric Co., Ltd. | Magneto-impedance effect element and method of manufacturing the same |
| CN101200792A (en) * | 2006-12-15 | 2008-06-18 | 北京国浩微磁电子智能传感器技术研究所 | Magneto-elastic amorphous wire material and magnetoelastic displacement transducer |
| CN101236817A (en) * | 2007-12-21 | 2008-08-06 | 安泰科技股份有限公司 | Magnetic sensitive material and its making method |
| CN103107282A (en) * | 2013-02-05 | 2013-05-15 | 兰州大学 | Method for improving giant magneto-impedance effect of materials |
Non-Patent Citations (2)
| Title |
|---|
| S.L.ZHANG ET AL.: "Large GMI effect in Co-rich amorphous wire by tensile stress", 《JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS》 * |
| 张树玲: "熔体抽拉Co基非晶丝的磁化及GMI效应研究", 《中国博士学位论文全文数据库·工程科技Ⅰ辑》 * |
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Application publication date: 20190118 |