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Noncrystalline soft magnetic alloy powder and dust core, electricwale absorber using the same

A soft magnetic alloy and amorphous technology, which is applied in the field of pressed powder core and radio wave absorber, using its pressed powder core and its radio wave absorber, amorphous soft magnetic alloy powder, can solve the problem of amorphous alloy powder Amorphous, difficult to control particle size, fast cooling speed and other problems, to achieve high saturation magnetization, easy amorphization, high cooling speed effect

Active Publication Date: 2004-04-07
ALPS ALPINE CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

If the water spray method is used, the manufacturing equipment can be enlarged and the molten alloy can be pulverized under high pressure, so the throughput can be increased, and in general, the water spray method has a higher cooling rate than the case of using an inert gas , Therefore, it is easy to amorphize, but the amorphous alloy powder obtained by the water spray method is amorphous and cannot be spherical.
[0023] Moreover, Fe-Si-B-based spherical amorphous alloy powder or Co-based spherical amorphous alloy powder can be produced by the gas spray method, but it is difficult to produce the above-mentioned composition by the common water spray method with a fast cooling rate. Spherical amorphous alloy powder
[0024] This amorphous amorphous alloy powder has a lot of unevenness on the surface, so the molding density is low. When it is mixed and solidified with the above-mentioned binder material, it is very difficult to obtain insulation between the powders, and it is impossible to obtain a dust core with excellent characteristics.
Moreover, if the amorphous alloy powder is amorphous, the product obtained by processing the amorphous alloy powder through Atleta is solidified and formed into a sheet together with the above-mentioned bonding material. During tower processing, the amorphous alloy powder becomes finer and cracks, so it is difficult to control the particle size, and in particular, it is impossible to obtain a radio wave absorber with excellent characteristics
[0025] A nearly spherical soft magnetic alloy powder is produced by a water spray method. For example, it is described in Patent Document 4. The alloy powder obtained by this water spray method is Fe-Ni-Cr-Si-B system, and the crystal phase The mixing ratio is high, so a step for amorphization is required. In this patent document 4, when this alloy is pulverized and flattened with a media agitation mill, it is amorphized, and it is easy to mix in the alloy from the above-mentioned mill. Impurities, deterioration of characteristics, and increase in the number of processes

Method used

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  • Noncrystalline soft magnetic alloy powder and dust core, electricwale absorber using the same
  • Noncrystalline soft magnetic alloy powder and dust core, electricwale absorber using the same
  • Noncrystalline soft magnetic alloy powder and dust core, electricwale absorber using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 6

[0361] The particle size and fluidity of the granulated powder were studied.

[0362] The so-called fluidity means that when 50 g of granulated powder is poured into a hole with a diameter of 2.5 mm, the particle diameter of the granulated powder is changed, and the time (seconds) for passing through the hole is measured. The granulated powder used here is a mixture of 98.3% by weight of the amorphous soft magnetic alloy powder of the embodiment, 1.4% by weight of silicone resin as an insulating material, and 0.3% by weight of zinc stearate as a lubricant. product of. The granulated powder produced in this way is classified into particle diameters of less than 45 microns, 45 microns to 150 microns, 150 microns to 300 microns, 300 microns to 500 microns, more than 500 microns, 45 microns to 300 microns , 45 microns above to 500 microns below, used for fluidity test (JIS 2502-1958).

[0363] As a result, the granulated powder did not flow when the particle size was less than 4...

Embodiment 7

[0366] The mixing amount (% by weight) and fluidity of the granulated powder having a particle size of less than 45 micrometers in the entire granulated powder were investigated. result in Figure 5 express. The so-called fluidity here means that when the granulated powder flows into a hole with a diameter of 2.5 mm, the time (seconds) to pass through the hole is measured by varying the amount of granulated powder with a particle size of less than 45 microns that accounts for 50 g of the entire granulated powder. The granulated powder used here is a mixture of 98.3% by weight of the amorphous soft magnetic alloy powder of the embodiment, 1.4% by weight of silicone resin as an insulating material, and 0.3% by weight of zinc stearate as a lubricant. product of. The thus-produced granulated powder was classified into those having a particle diameter of less than 45 micrometers, those exceeding 45 micrometers, and those below 500 micrometers, and used for a fluidity test (JIS 25...

Embodiment 8

[0369] In addition to using the soft magnetic alloy powder of No.23 manufactured in Example 4 above (the composition is Fe 74.4 Cr 1.96 P 9.04 C 2.16 B 7.54 Si 4.87 ) except that granulated powders were produced in the same manner as in the above-mentioned Example 1, and further using these granulated powders, the dust cores of the same examples as in the above-mentioned Example 1 were produced.

[0370] For comparison, granulated powders were produced in the same manner as in Example 1 above except that Fe powder was used, and further using these granulated powders, a dust core was produced in the same manner as in Example 1 above (Comparative Example 1).

[0371] For comparison, except that Ni-Fe-Mo (Mo-based permalloy) powder used in conventional low-loss cores was used, a granulated powder was produced in the same manner as in Example 1 above, and this granulated powder was used In the same manner as in Example 1 above, a dust core (Comparative Example 2) was produced...

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Abstract

Provided is amorphous soft magnetic alloy powder which has high saturation magnetization and low core loss and which is almost spherical and manufactured by water atomization method, and to provide a green compact core and radio wave absorber using the same. This amorphous soft magnetic alloy powder is formed substantially spherical by the water atomization method. The powder mainly consists of Fe and contains at least P, C and B, and is formed of amorphous soft magnetic alloy powder consisting of an amorphous phase with a temperature interval DeltaTx of the supercooled liquid of >= 20K. A green compact core is formed by solidifying the granulated mixture of this amorphous soft magnetic alloy powder, insulator and lubricant. The radio wave absorber is formed by mixing the amorphous soft magnetic alloy powder the particles of which is flattened and insulator.

Description

technical field [0001] The present invention relates to an amorphous soft magnetic alloy powder, a powder core using the powder core and an electromagnetic wave absorber thereof, and particularly relates to a near-spherical amorphous soft magnetic alloy powder which can be produced by a water atomization method, and a powder core using the same and radio wave absorbers. Background technique [0002] For a long time, the alloy composed of TM-Al-Ga-P-C-B-Si system, etc. (TM is a transition metal element such as Fe, Co, Ni) forms an amorphous phase by quenching the alloy melt, and they form Amorphous soft magnetic alloys are known (for example, refer to Patent Documents 1 and 3). In particular, it is also known that an amorphous soft magnetic alloy having a specific composition has a wide temperature range before crystallization in a supercooled liquid state, that is, constitutes a metallic glassy alloy. [0003] This metallic vitreous alloy has excellent soft magnetic proper...

Claims

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Application Information

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IPC IPC(8): B22F9/08B22F1/00B22F3/00C22C38/00C22C45/02H01F1/00H01F1/153H01F1/20H01F3/08
CPCC22C45/02
Inventor 小柴寿人吉田昌二剱物英贵内藤丰福村弘明水嵨隆夫
Owner ALPS ALPINE CO LTD
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