CN113109395A - Nondestructive testing method for measuring content of magnetic components in magnetic composite material - Google Patents
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- CN113109395A CN113109395A CN202110427457.0A CN202110427457A CN113109395A CN 113109395 A CN113109395 A CN 113109395A CN 202110427457 A CN202110427457 A CN 202110427457A CN 113109395 A CN113109395 A CN 113109395A
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- 239000002131 composite material Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 230000008859 change Effects 0.000 claims abstract description 12
- 230000008569 process Effects 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims description 13
- 239000006247 magnetic powder Substances 0.000 claims description 5
- 229910001004 magnetic alloy Inorganic materials 0.000 claims description 4
- 238000013329 compounding Methods 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000007822 coupling agent Substances 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000004044 response Effects 0.000 abstract description 2
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 9
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229960000074 biopharmaceutical Drugs 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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Abstract
The invention relates to the field of nondestructive testing and measurement, in particular to a nondestructive testing method for measuring the content of magnetic components in a magnetic composite material, which comprises the following steps: (1) preparing a measuring device; (2) placing an inductance coil on a magnetic composite material with unknown magnetic component content, and completing real-time acquisition of inductance data of a closed loop of a measuring device under multiple frequencies by using an inductance tester; (3) drawing a histogram 'delta Ls-f' of the coil inductance value changing along with the frequency according to the acquired inductance data; (4) and measuring the change of the inductance value of the standard sample along with the frequency, and comparing to obtain the content value of the magnetic component in the magnetic composite material. The invention has no damage to the tested material in the testing process, does not need a coupling agent, has objective and real data, quick signal response, low manufacturing cost of the measuring device and simple and convenient preparation process.
Description
Technical Field
The invention relates to the field of nondestructive testing and measurement, in particular to a nondestructive testing method for measuring the content of magnetic components in a magnetic composite material.
Background
At the present stage, in some high and new technology industries in China, such as aerospace, biopharmaceutical, electronic chip and other technologies, the usage amount of the composite material is very large, and the requirement on the quality is also very strict. In this context, nondestructive testing techniques based on composite materials have been rapidly developed. The nondestructive testing technology can not damage the structure and the shape of the material and influence the use performance of the composite material in the testing process. At present, the most applied nondestructive testing of composite materials is X-ray detection, infrared thermal imaging detection and ultrasonic detection, so as to obtain structural information and defect conditions of the materials, but the detection methods have the problems of complex operation, time and labor waste, limited detection area and the like. On the other hand, the magnetic composite material is easy to have the problem of uneven distribution of magnetic components in the production process, and the information such as the content of the magnetic components in each area in the composite material cannot be determined. Therefore, it is important to develop a simple, convenient and easy-to-operate nondestructive testing method.
Disclosure of Invention
The invention aims to solve the problems and provide a test method for measuring the content of magnetic components in a magnetic composite material on the premise of not damaging a sample, and the method can detect whether the magnetic components in the composite material are uniformly dispersed.
In order to achieve the purpose, the invention adopts the technical scheme that:
a nondestructive testing method for measuring the content of magnetic components in a magnetic composite material comprises the following steps:
(1) preparing a measuring device, wherein the measuring device used for testing comprises an inductance coil and an inductance tester, and the inductance coil is connected with the inductance tester in series;
(2) placing an inductance coil on a magnetic composite material with unknown magnetic component content, changing the inductance of the inductance coil, and completing real-time acquisition of inductance data of a closed loop of a measuring device under multiple frequencies by using an inductance tester;
(3) drawing a histogram 'delta Ls-f' of the coil inductance value changing along with the frequency according to the acquired inductance data;
(4) and (3) establishing a small database by measuring the change of the inductance value of the standard sample along with the frequency, and comparing the data obtained in the step (3) with the small database to obtain the content value of the magnetic component in the magnetic composite material.
Further, in the step (1), the outer diameter of the inductance coil is 12mm, the height of the coil is 10mm, and the number of turns of the coil is N > 10.
Further, in the step (2), the plurality of frequencies range from 1Hz to 1MHz, and 4 frequencies, such as 100Hz, 1KHz, 10KHz, and 100KHz, may be selected.
Furthermore, the magnetic composite material is formed by compounding magnetic alloy powder and a polymer matrix.
Further, the standard sample is a magnetic composite material with a plurality of different magnetic component contents, and the steps of obtaining a small database are as follows: placing an inductance coil of a measuring device on a standard sample, changing the frequency in the testing process, and completing real-time acquisition of inductance data of a closed loop of the testing device under multiple frequencies by using an inductance tester; drawing an inductance change trend graph 'Ls-f' and 'delta Ls-f' under a plurality of frequencies to establish a small database; the plurality of frequencies are the same as the frequencies in step (2).
Further, in the step (2), an inductance coil of the measuring device is placed on the magnetic composite material with unknown content of the magnetic component, and moves on the magnetic composite material, and whether the magnetic powder is uniformly distributed is judged according to whether the inductance changes.
The content of the same component shows different characteristics under the action of different frequencies, and the uniqueness problem is effectively solved by representing the content of the same component through linkage of a plurality of frequencies (within 1 MHz). After the test sample is tested, the content of the magnetic component in the composite material can be determined only by simultaneously meeting the correspondence of the inductance attributes under a plurality of frequencies, so that the measurement of the content of the magnetic component in the magnetic composite material is realized.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention has no damage to the tested material in the testing process, does not need a coupling agent, has objective and real data, quick signal response and accurate measurement;
2. the measuring device has low manufacturing cost and simple and convenient preparation process;
3. the measuring method has the advantages of high sensitivity, high timeliness and simple operation.
Drawings
FIG. 1 is a schematic view of a testing apparatus according to the present invention; wherein 1 is an inductance coil, 2 is a magnetic composite material, and 3 is an inductance tester;
FIG. 2 shows 200 mesh Fe78Si13B9A plot of the standard sample 'delta Ls-f';
FIG. 3 shows that the content of unknown magnetic component is 200 mesh Fe78Si13B9A diagram of a delta Ls-f of the amorphous alloy powder magnetic composite material;
FIG. 4 shows that the content of different magnetic components is 200 meshes Fe78Si13B9Ls-f diagrams of different areas of the amorphous alloy powder magnetic composite material;
FIG. 5 shows that the content of different magnetic components is 200 meshes Fe78Si13B9And a delta Ls-f diagram of different areas of the amorphous alloy powder magnetic composite material.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1 determination of magnetic powder as 200 mesh Fe78Si13B9Magnetic component content of magnetic composite material of amorphous alloy powder
(1) Preparing a measuring device, wherein the measuring device used for testing comprises an inductance coil 1 and a TH-2822E type inductance tester 3, and the inductance coil 1 is connected with the TH-2822E type inductance tester 3 in series; the outer diameter of the inductance coil 1 is 12mm, the height of the coil is 10mm, and the number of turns of the coil is 50.
(2) Taking magnetic powder with unknown content as 200 meshes of Fe78Si13B9The method comprises the following steps of (1) preparing amorphous alloy powder and a magnetic composite material with a rubber substrate, adjusting the specification of a sample to be 20 x 20mm and the thickness to be 1mm, placing an inductance coil 1 on the magnetic composite material 2, selecting 4 frequencies of 100Hz, 1KHz, 10KHz and 100KHz respectively when the inductance of the inductance coil changes, and completing real-time acquisition of inductance data under the 4 frequencies of a closed loop of a measuring device by using an inductance tester;
(3) drawing a histogram 'delta Ls-f' of the coil inductance value changing with the frequency according to the acquired inductance data, as shown in fig. 3;
(4) preparing magnetic composite material standard samples with different magnetic component contents of 10%, 30%, 50%, 70% and 90%, respectively, and selecting 200-mesh Fe as magnetic alloy powder78Si13B9Amorphous alloy powder, mechanically blending the amorphous alloy powder with rubber, and pressing into a sheet, wherein the specification of a test sample is 20 x 20mm, and the thickness of the test sample is 1 mm. Placing an inductance coil 1 on standard samples with different magnetic component contents, respectively selecting 4 frequencies of 100Hz, 1KHz, 10KHz and 100KHz, utilizing an inductance tester to complete real-time acquisition of inductance data under 4 frequencies of a closed loop of a measuring device, drawing an inductance change trend graph "Ls-f" and "delta Ls-f" under 4 frequencies to establish a small database, as shown in fig. 2, and comparing the data obtained in the step (3) with the small database, so that the inductance change value of the sample under the 100Hz frequency in the step (3) is 9.218 muH, the inductances of the samples under the 1KHz, 10KHz and 100KHz frequencies are 9.087 muH, 7.263 muH and 3.33 muH respectively, and the inductance change values completely correspond to the inductance change values under different frequencies of 50 percent of the standard samples in the small database, and the content value of the magnetic component of the magnetic composite material is 50 percent.
Example 2 detection of the Dispersion homogeneity of magnetic Components in magnetic composite Material
1. Preparing magnetic composite material samples with different component contents of 10%, 30%, 50%, 70% and 90%, respectively, and selecting 200-mesh Fe as magnetic alloy powder78Si13B9Amorphous alloy powder, mechanically blending the amorphous alloy powder with rubber, and pressing into a sheet, wherein the specification of a test sample is 100 x 100mm, and the thickness is 1 mm.
2. Preparing a measuring device, wherein the measuring device used for testing comprises an inductance coil 1 and a TH-2822E type inductance tester 3, and the inductance coil 1 is connected with the TH-2822E type inductance tester 3 in series; the outer diameter of the inductance coil 1 is 12mm, the height of the coil is 10mm, and the number of turns of the coil is 50;
3. and placing the inductance coil on the magnetic composite material to move, and judging whether the magnetic powder is uniformly distributed according to whether the inductance changes under the same component content. The inductance of the inductance coil arranged on the magnetic composite material with different component contents can change, and meanwhile, the inductance tester is utilized to complete the real-time acquisition of inductance data of the closed loop of the testing device under different frequencies; "
4. When the inductance change trend graphs "Ls-f" and "Δ Ls-f" (shown in fig. 4 and 5) are drawn along with the movement of the coil, when the magnetic component content in the magnetic composite material is respectively 10%, 30%, 50%, 70% and 90%, the inductance increase values are respectively about 1.3 μ H, 4 μ H, 9 μ H, 18 μ H and 50 μ H. The inductance change value increases with the increase of the content of the magnetic component in the magnetic composite material. When the content of the magnetic component is low, the uniformity of the composite material is higher. Different inductance attributes are reflected when the content of the components is changed, and the detection of the dispersion uniformity of the magnetic components in the magnetic composite material is realized.
Although the invention has been described and illustrated in some detail, it should be understood that various modifications may be made to the described embodiments or equivalents may be substituted, as will be apparent to those skilled in the art, without departing from the spirit of the invention.
Claims (6)
1. A nondestructive testing method for measuring the content of magnetic components in a magnetic composite material is characterized by comprising the following steps:
(1) preparing a measuring device, wherein the measuring device used for testing comprises an inductance coil and an inductance tester, and the inductance coil is connected with the inductance tester in series;
(2) placing an inductance coil on a magnetic composite material with unknown magnetic component content, changing the inductance of the inductance coil, and completing real-time acquisition of inductance data of a closed loop of a measuring device under multiple frequencies by using an inductance tester;
(3) drawing a histogram 'delta Ls-f' of the inductance value of the coil changing along with the frequency according to the acquired inductance data;
(4) and (3) establishing a small database by measuring the change of the inductance value of the standard sample along with the frequency, and comparing the data obtained in the step (3) with the small database to obtain the content value of the magnetic component in the magnetic composite material.
2. The nondestructive testing method for measuring the content of the magnetic component in the magnetic composite material according to claim 1, wherein in the step (1), the outer diameter of the inductance coil is 12mm, the height of the coil is 10mm, and the number of turns of the coil is N > 10.
3. The nondestructive testing method for measuring the content of a magnetic component in a magnetic composite material according to claim 1, wherein the plurality of frequencies in the step (2) are in a range of 1Hz to 1 MHz.
4. The nondestructive testing method for measuring the content of the magnetic component in the magnetic composite material according to claim 1, wherein the magnetic composite material is formed by compounding magnetic alloy powder and a polymer matrix.
5. The nondestructive testing method for measuring the content of the magnetic component in the magnetic composite material according to claim 1, wherein the standard sample is a magnetic composite material with a plurality of different contents of the magnetic component, and the steps of obtaining a small database are as follows: placing an inductance coil of a measuring device on a standard sample, changing the frequency in the testing process, and completing real-time acquisition of inductance data of a closed loop of the testing device under multiple frequencies by using an inductance tester; drawing an inductance change trend graph 'Ls-f' and 'delta Ls-f' under a plurality of frequencies to establish a small database; the plurality of frequencies are the same as the frequencies in step (2).
6. The nondestructive testing method for measuring the content of the magnetic component in the magnetic composite material according to claim 1, wherein in the step (2), the inductance coil of the measuring device is placed on the magnetic composite material with unknown content of the magnetic component and moves on the magnetic composite material, and whether the magnetic powder is uniformly distributed is judged according to whether the inductance is changed.
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