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Flat amorphous alloy powder and electromagnetic wave absorber containing same

An amorphous alloy, flat technology, applied in electrical components, magnetic field/electric field shielding, etc., can solve the problems of the preparation method and performance limitation of the absorber

Inactive Publication Date: 2010-01-13
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, the preparation method and performance of the absorber in the prior art are limited to a certain extent

Method used

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  • Flat amorphous alloy powder and electromagnetic wave absorber containing same
  • Flat amorphous alloy powder and electromagnetic wave absorber containing same
  • Flat amorphous alloy powder and electromagnetic wave absorber containing same

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0038] In this embodiment, the alloy composition is selected as Fe 74 Cr 2 Mo 2 sn 2 P 10 Si 4 B 4 C 2 , prepared into spherical amorphous alloy powder by water atomization method, the atomization pressure is 30Kg / cm 2 . Dry the atomized product in a vacuum drying oven at 180° C. for 8 hours, and sieve the dried product to obtain spherical amorphous alloy powder with an average particle size of 40-50 μm.

[0039] Wet ball milling in a planetary ball mill with a ball-to-material ratio of 5:1, a rotational speed of 400 rpm, and a ball milling time of 10 hours and 16 hours to obtain two types of flat powders with different aspect ratios.

[0040] Powder morphology was observed under a scanning electron microscope ( figure 1 , figure 2 , image 3 ). Depend on figure 1 It can be seen that water atomization produces nearly spherical powders. Depend on figure 2 , image 3 It can be seen that the nearly spherical powder is transformed into a flat powder after ball mi...

Embodiment 2

[0048] Iron-based amorphous alloys with different compositions were used to prepare amorphous alloy powders according to the same atomization method as in Example 1. The alloy composition used is Fe 72 Cr 1 Mo 1 sn 2 P 15 Si 1 B 7.5 C 0.5 , Fe 72 Cr 5 Mo 3 sn 2 P 3 Si 2 B 12 C 1 , Fe 72 Cr 1 Mo 1 sn 3 P 8 Si 8 B 1 C 6 , Fe 73 Cr 2 Nb 5 sn 2 P 2 Si 8 B 6 C 2 , Fe 74 Cr 2 Mo 2 sn 2 P 10 Si 4 B 4 C 2 , Fe 76 Cr 1 Mo 1 al 4 P 8 Si 8 B 1 C 1 , Fe 78 Cr 1 Mo 1 sn 2 P 8 Si 8 B 1 C 1 .

[0049] The prepared atomized powder adopts X-ray diffractometer to measure its crystal structure, such as Image 6 shown. from Image 6 It can be seen that the X-ray diffraction pattern of the obtained powder has no crystallization peak, showing obvious amorphous structure characteristics, which indicates that the alloy powder of the present invention is amorphous. The atomized powder was wet-milled in a planetary ball mill with a ball-to-mater...

Embodiment 3

[0056] The powder of this embodiment is composed of Fe 73 Cr 2 Nb 5 sn 2 P 2 Si 8 B 6 C 2 The iron-based amorphous alloy was prepared into powder by the same atomization method as in Example 1. The flat powder was prepared by the same ball milling process as in Example 2, and then the powder was heat-treated in a vacuum heat treatment with a process parameter of keeping the temperature at 440° C. for 1 hour.

[0057]Disperse the flat powder into thermoplastic polyurethane to prepare absorbers with flat powder filling rates of 20vol.%, 30vol.%, 40vol.%, 50vol.%, 60vol.%, 70vol.%. The specific steps are: a. Use organic solvent nitrogen methyl formamide to dissolve thermoplastic polyurethane to prepare a coating with thermoplastic polyurethane content of 20vol.%. According to the filling rate requirements, add a certain amount of the above-mentioned flat powder and use a mixer at 1000rpm Stir for 1 hour b. Use a stirrer to stir for 1 hour at 1000rpm, so that the preparati...

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Abstract

The invention relates to a flat amorphous alloy powder and a preparation method thereof. The composition of the flat amorphous alloy powder satisfies the following chemical formula expressed in an atomic ratio: Fe<(100-a-b-c-x-y-z-t)>CraMbTcPxSiyBzCt, wherein M is selected from Mo or Nb; T is selected from one of or both Sn and Al; and a, b, c, x, y, z and t expressing the atomic composition percentage are respectively: a is more than or equal to 1 and smaller than or equal to 5; b is more than or equal to 1 and smaller than or equal to 5; c is more than or equal to 2 and smaller than or equal to 4; a plus b is more than or equal to 2 and smaller than or equal to 8; x is more than or equal to 2 and smaller than or equal to 15; y is more than or equal to 1 and smaller than or equal to 8; z is more than or equal to 1 and smaller than or equal to 12; and t is more than or equal to 0.5 and smaller than or equal to 6. The invention also relates to an electromagnetic wave absorber containing the powder. The electromagnetic wave absorber is formed by compounding the flat powder and a polymer insulating material, and has an excellent electromagnetic wave absorption characteristic within a frequency range of 10MHz to 3GHz.

Description

technical field [0001] The present invention relates to a flat amorphous alloy powder and an electromagnetic wave absorber containing the powder, in particular, to a flat amorphous alloy powder having electromagnetic wave absorption characteristics in the 10MHz-3GHz frequency band and an electromagnetic wave absorber containing the alloy powder body. Background technique [0002] With the high frequency, integration, and miniaturization of digital devices such as digital cameras, mobile phones, and notebook computers, the problem of electromagnetic compatibility has become more and more serious. It not only affects the safety and reliability of electronic equipment, but also endangers human health and ecosystems. [0003] The problem of electromagnetic compatibility has attracted the attention of industrialized countries in the world, especially since the 1970s, a lot of theoretical research and experimental work have been carried out. Furthermore, it proposes a new subjec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/02C22C45/00B22F9/04H05K9/00
Inventor 李德仁卢志超刘开煌刘天成张亮陆曹卫郭峰周少雄
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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