CN110618151A - Method for rapidly judging strength of magnetic permeability of FeSiAl material - Google Patents
Method for rapidly judging strength of magnetic permeability of FeSiAl material Download PDFInfo
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Abstract
The invention discloses a method for rapidly judging the strength of the magnetic conductivity of a FeSiAl material, which comprises the following steps: performing phase analysis on the FeSiAl material by using an X-ray diffractometer to obtain an XRD (X-ray diffraction) spectrum of the FeSiAl material, and performing DO (DO all) analysis according to the XRD spectrum3And judging the magnetic permeability of the FeSiAl material according to the characteristic peak intensity of the phase and the BCC phase. When the XRD pattern of the FeSiAl material simultaneously satisfies the characteristic (1) DO3All the characteristic kurtosis corresponding to BCC exist, and (2) when the half-peak width of all the characteristic peaks is less than 1, DO is compared3The strength of the main phase peak and the strength of the main BCC phase peak can be judged that the magnetic permeability strength of the FeSiAl material is less than 50H/m, between 50H/m and 100H/m or more than 100H/m. The invention provides a brand new method for judging the strength of the magnetic conductivity of the FeSiAl material, the strength of the magnetic conductivity of the FeSiAl material is judged by the XRD characteristic spectrum of the FeSiAl material, the method is simple and easy to implement, the testing cost is greatly reduced, the research and development rate is improved, and agile research and development guidance is provided for research and development personnel in the field.
Description
Technical Field
The invention relates to a method for judging the strength of magnetic conductivity, in particular to a method for quickly judging the strength of the magnetic conductivity of a FeSiAl material, and belongs to the field of electronic component material preparation.
Background
The age of 5G is coming. Compared with 4G technology, the introduction of 5G network high frequency, the upgrading of hardware parts and the multiple increase of the number of antennas, and the electromagnetic interference between devices and inside the devices is ubiquitous. The bottleneck of future high-frequency and high-power electronic products is the electromagnetic radiation generated by the electronic products, and in order to solve the problem, more and more electromagnetic shielding devices are added into the electronic products during design. The wave-absorbing material can be commercialized by magnetic loss type ferrite wave-absorbing material and magnetic metal wave-absorbing material.
The wave-absorbing and magnetic-isolating patch taking FeSiAl as a wave-absorbing source is widely applied to some commercialized wave-absorbing and magnetic-isolating patches. For commercial FeSiAl wave-absorbing products, it is critical to improve the quality and reduce the cost at the same time. For the FeSiAl wave-absorbing film, the magnetic permeability is one of the key indexes, and the traditional detection means is to detect the magnetic permeability by an impedance analyzer. However, in the actual production research and development process, because the impedance analyzer is expensive and the outgoing detection cost is high, the magnetic permeability cannot be detected at any moment in the research and development process, but it is necessary for agile research and development to judge the quality of the research and development product in real time so as to guide the next research and development.
Therefore, a new method for determining the magnetic permeability of the FeSiAl material is needed.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems of expensive equipment, complex test, inconvenience for agile research and development and the like of the existing FeSiAl permeability detection means, the invention provides a method for rapidly judging the strength of the permeability of a FeSiAl material, so that the detection cost is greatly reduced and the detection efficiency is improved.
The technical scheme is as follows: the invention relates to a method for rapidly judging the strength of the magnetic permeability of a FeSiAl material, which comprises the following steps: performing phase analysis on the FeSiAl material by using an X-ray diffractometer to obtain an XRD (X-ray diffraction) spectrum of the FeSiAl material, and performing DO (DO all) analysis according to the XRD spectrum3And judging the magnetic permeability of the FeSiAl material according to the characteristic peak intensity of the phase and the BCC phase.
Specifically, when the XRD pattern of the FeSiAl material has the following characteristics, the magnetic permeability is more than 100H/m:
(1) with DO3All characteristic peaks corresponding to BCC;
(2) the half-peak widths of all characteristic peaks are less than 1 degree;
(3)DO3principal of the phaseThe ratio of the peak intensity to the intensity of the main peak of the BCC phase is greater than 2.
When the XRD pattern of the FeSiAl material has the following characteristics, the magnetic permeability is 50-100H/m:
(1) with DO3All characteristic peaks corresponding to BCC;
(2) the half-peak widths of all characteristic peaks are less than 1 degree;
(3)DO3the ratio of the main peak intensity of the phase to the main peak intensity of the BCC phase is 1-2.
When the XRD pattern of the FeSiAl material satisfies the following characteristics (1) to (3), or does not satisfy the following characteristics (1) or (2), the magnetic permeability of the FeSiAl material is less than 50H/m:
(1) with DO3All characteristic peaks corresponding to BCC;
(2) the half-peak widths of all characteristic peaks are less than 1 degree;
(3)DO3the ratio of the intensity of the main peak of the phase to the intensity of the main peak of the BCC phase is less than 1.
Wherein, DO3The corresponding characteristic peak angles include 25-27 degrees, 30-32 degrees and 65-67 degrees, and the main peak angle is 65-67 degrees; the characteristic peak angles corresponding to BCC include 44-46 degrees, 53-55 degrees and 56-57 degrees, and the main peak angle is 44-46 degrees.
Has the advantages that: compared with the prior art, the invention provides a brand-new method for judging the strength of the magnetic conductivity of the FeSiAl material, the strength of the magnetic conductivity of the FeSiAl material is judged by the XRD characteristic spectrum of the FeSiAl material, the method is simple and easy to implement, the testing cost is greatly reduced, the research and development rate is improved, and quick research and development guidance is provided for research and development personnel in the field.
Drawings
FIG. 1 is an XRD spectrum of a FeSiAl absorber film with a permeability of 120H/m in example 1;
FIG. 2 is an SEM photograph of FeSiAl raw powder in example 1;
FIG. 3 is an XRD pattern of FeSiAl raw powder in example 1;
FIG. 4 is a cross-sectional SEM image of FeSiAl flakes in example 1 after being aligned;
FIG. 5 is an XRD pattern of FeSiAl flakes aligned in an ordered manner in example 1;
FIG. 6 is a SEM image of a cross-section of FeSiAl flakes of example 1 after increased compaction density;
FIG. 7 is an XRD pattern of FeSiAl material with 8H/m permeability in example 2.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
The invention relates to a method for rapidly judging the strength of the magnetic conductivity of a FeSiAl material, which comprises the following steps: carrying out phase analysis on the FeSiAl material by using an X-ray diffractometer to obtain an XRD (X-ray diffraction) spectrum of the FeSiAl material; according to DO in XRD pattern3And judging the magnetic permeability of the FeSiAl material according to the characteristic peak intensity of the phase and the BCC phase.
Specifically, two cases can be divided:
the first method comprises the following steps: when the XRD pattern of the FeSiAl material simultaneously satisfies the characteristic (1) DO3All characteristic kurtosis corresponding to BCC exist, and (2) when half-peak widths of all characteristic peaks are less than 1, DO is mainly determined by comparing DO3Judging the magnetic conductivity of the FeSiAl material according to the strength ratio of the main phase peak to the main BCC phase peak: when DO is present3When the ratio of the main peak intensity of the phase to the main peak intensity of the BCC phase is less than 1, the magnetic conductivity intensity of the FeSiAl powder is less than 50H/m; when DO is present3When the ratio of the main peak intensity of the phase to the main peak intensity of the BCC phase is 1-2, the magnetic permeability of the FeSiAl powder is 50H/m-100H/m; when DO is present3When the ratio of the main peak intensity of the phase to the main peak intensity of the BCC phase is more than 2, the magnetic permeability of the FeSiAl powder is more than 100H/m.
Wherein, DO3The corresponding characteristic peak angles include 25-27 degrees, 30-32 degrees and 65-67 degrees, the main peak angle is 65-67 degrees, the BCC corresponding characteristic peak angle is 44-46 degrees, 53-55 degrees and 56-57 degrees, and the main peak angle is 44-46 degrees;
for example, when the permeability is equal to 100H/m, the characteristic peaks are represented as: a. with DO3All characteristic peaks of the phases and the BCC phase; b. the half-peak width of all characteristic peaks is 0.5-0.8; c. DO3The main peak intensity of the characteristic peak of the phase is 2 times the main peak intensity of the BCC phase.
And the second method comprises the following steps: when the XRD pattern of the FeSiAl material does not meet the characteristic (1) DO3And when all the characteristic peak degrees corresponding to the phase and the BCC exist or do not meet the requirement that the half-peak widths of all the characteristic peaks of the characteristic (2) are less than 1, the magnetic permeability strength of the FeSiAl powder is less than 50H/m.
The magnetic permeability test of the FeSiAl material is generally carried out under the frequency of 13.6MHz, and the rapid judgment method is suitable for the test under the frequency of 13.6 MHz.
Example 1
The FeSiAl wave absorption film with the magnetic conductivity of 120H/m at 13.6@ MHz is prepared, and XRD (X-ray diffraction) pattern analysis is carried out on products at different preparation stages in the preparation process.
(1) FeSiAl raw powder
The SEM image of the FeSiAl raw powder is shown in fig. 2, and it can be seen that the FeSiAl raw powder is a flaky powder.
The XRD pattern of the FeSiAl raw powder is shown in figure 3. It can be seen that the characteristic peak of XRD corresponding to FeSiAl raw powder has DO3All characteristic peaks of the phases and BCC phases, all characteristic peaks having a half-value width of less than 1, and DO3The intensity of the main peak of the phase from 65 DEG to 67 DEG is less than the intensity of the main peak of the BCC phase from 44 DEG to 46 deg. From the above characteristics, it can be judged that the magnetic permeability is less than 50H/m.
The magnetic permeability of the FeSiAl raw powder is tested by an impedance analyzer and found to be 45H/m at 13.6@ MHz.
(2) In-line orientation
The SEM appearance of the cross section of the FeSiAl flaky powder after being aligned in an orderly mode is shown in figure 4, and the corresponding XRD pattern is shown in figure 5. As can be seen, after the FeSiAl flake powder is aligned, the corresponding XRD characteristic peak has DO3All characteristic peaks of the phases and BCC phases, all characteristic peaks having a half-value width of less than 1, and DO3The intensity of the main peaks of the phases from 65 DEG to 67 DEG has exceeded the intensity of the main peaks of the BCC phase from 44 DEG to 46 DEG, with a ratio of more than 1 and less than 2. From the above characteristics, it is judged that the magnetic permeability is more than 50H/m and less than 100H/m.
The permeability of FeSiAl is tested by an impedance analyzer and is found to be 80H/m at 13.6@ MHz.
(3) Compacting to obtain the FeSiAl absorption film
Compacting the FeSiAl flake powder after being aligned in the row direction, wherein the compaction density is 3gcm-3. The cross-section SEM of FeSiAl after compaction density raising is shown in figure 6, and the corresponding XRD pattern is shown in figure 1.
As can be seen, DO3The characteristic peak of the phase is obviously enhanced, the characteristic peak of the BCC phase is relatively weakened, the half-peak width of each characteristic peak is 0.5-0.8 degrees, and DO (Do oxygen) is added3The main peak intensity of the phase is more than 2 times of that of the BCC phase. Therefore, the magnetic permeability of the FeSiAl absorption film is judged to be more than 100H/m.
The permeability of the FeSiAl absorption film is tested by an impedance analyzer, and the permeability of the FeSiAl absorption film is 120H/m at 13.6@ MHz.
The embodiment can prove that the judging method is feasible.
Example 2
This example measured the XRD characteristic peaks of FeSiAl thin films with lower permeability, and FIG. 7 shows the XRD characteristic peaks of FeSiAl thin films with 8H/m permeability at 13.6 MHz.
As can be seen, these XRD's have only the BCC phase 44-46 ° peak and DO3The phase is at 65-67 degrees, the two peaks are respectively the main peak, and the peak width is wider between 2-3 degrees. According to the characteristics of the XRD pattern, the magnetic permeability is lower than 50H/m and is consistent with the actual magnetic permeability.
Claims (5)
1. A method for rapidly judging the strength of the magnetic permeability of a FeSiAl material is characterized by comprising the following steps: performing phase analysis on the FeSiAl material by using an X-ray diffractometer to obtain an XRD (X-ray diffraction) spectrum of the FeSiAl material, and performing DO (DO all) analysis according to the XRD spectrum3And judging the magnetic permeability of the FeSiAl material according to the characteristic peak intensity of the phase and the BCC phase.
2. The method for rapidly judging the strength of the permeability of the FeSiAl material according to claim 1, wherein when the XRD pattern of the FeSiAl material has the following characteristics, the permeability is more than 100H/m:
(1) with DO3All characteristic peaks corresponding to the BCC；
(2) The half-peak widths of all characteristic peaks are less than 1 degree;
(3)DO3the ratio of the intensity of the main peak of the phase to the intensity of the main peak of the BCC phase is greater than 2.
3. The method for rapidly judging the strength of the permeability of the FeSiAl material according to claim 1, wherein when the XRD pattern of the FeSiAl material has the following characteristics, the permeability is 50-100H/m:
(1) with DO3All characteristic peaks corresponding to BCC;
(2) the half-peak widths of all characteristic peaks are less than 1 degree;
(3)DO3the ratio of the main peak intensity of the phase to the main peak intensity of the BCC phase is 1-2.
4. The method for rapidly judging the strength of the permeability of the FeSiAl material according to claim 1, wherein when the XRD pattern of the FeSiAl material satisfies the following characteristics (1) to (3), or does not satisfy the following characteristics (1) or (2), the permeability is less than 50H/m:
(1) with DO3All characteristic peaks corresponding to BCC;
(2) the half-peak widths of all characteristic peaks are less than 1 degree;
(3)DO3the ratio of the intensity of the main peak of the phase to the intensity of the main peak of the BCC phase is less than 1.
5. The method for rapidly judging the strength of the magnetic permeability of the FeSiAl material according to any one of claims 2-4, wherein the DO is3The corresponding characteristic peak angles include 25-27 degrees, 30-32 degrees and 65-67 degrees, wherein the main peak angle is 65-67 degrees; the characteristic peak angles corresponding to the BCC include 44-46 degrees, 53-55 degrees and 56-57 degrees, wherein the main peak angle is 44-46 degrees.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111638102A (en) * | 2020-05-18 | 2020-09-08 | 湖南纳金新材料技术有限公司 | Method and device for nondestructive testing of sheet metal magnetic powder magnetic permeability |
| CN111638477A (en) * | 2020-05-18 | 2020-09-08 | 广州天兹新材料科技有限公司 | Method for nondestructive testing of sheet metal magnetic powder magnetic permeability |
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| CN111638102A (en) * | 2020-05-18 | 2020-09-08 | 湖南纳金新材料技术有限公司 | Method and device for nondestructive testing of sheet metal magnetic powder magnetic permeability |
| CN111638477A (en) * | 2020-05-18 | 2020-09-08 | 广州天兹新材料科技有限公司 | Method for nondestructive testing of sheet metal magnetic powder magnetic permeability |
| CN111638477B (en) * | 2020-05-18 | 2022-09-27 | 广州天兹新材料科技有限公司 | Method for nondestructive testing of sheet metal magnetic powder magnetic permeability |
| CN111638102B (en) * | 2020-05-18 | 2023-08-25 | 湖南纳金新材料技术有限公司 | Method and device for nondestructive testing of magnetic permeability of sheet metal magnetic powder |
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