Method for making nano-scale metal powder and method for making high-frequency soft magnetic core using same

一种金属粉末、软磁芯的技术，应用在金属加工设备、纳米结构制造、纳米技术等方向，能够解决导磁率降低等问题，达到涡电流损耗小、降低处理成本、佳热稳定性的效果

Inactive Publication Date: 2005-02-16
AMOXIANSI ELECTRONICS & ELECTRICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a frequency band of 1 MHz or more, the conventional technology has a problem that the magnetic permeability decreases

Method used

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  • Method for making nano-scale metal powder and method for making high-frequency soft magnetic core using same
  • Method for making nano-scale metal powder and method for making high-frequency soft magnetic core using same
  • Method for making nano-scale metal powder and method for making high-frequency soft magnetic core using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The Fe-containing 73.5 Cu 1 Nb 3 Si 13.5 B 9 The amorphous ribbons of the components were heat-treated in nitrogen at 540° C. for 40 minutes to obtain nanoscale grain ribbons. Such as figure 2 As shown, the size of the crystalline grains is 10 to 15 nm. After crushing the thin ribbon of nano-sized grains by using a crusher, the powder particles are classified and measured to obtain 50% powder passing through -100~+140 mesh and 50% passing through -140~+200 mesh purpose powder.

[0047] Then, the prepared nanoscale grain powder was mixed with 3 wt % of low-melting glass, and then dried. After drying, the bulk powder mixed with low-melting glass was re-rolled using a ball mill, and then 0.5 wt% of Zn-stearate was added to and mixed with the rolled powder. Thereafter, use a core forming die at 16 tons / cm 2 The powder mixed with Zn-stearate was molded under a molding pressure of 100 to obtain a ring magnetic core.

[0048] Thereafter, the magnetic core molded bod...

Embodiment 2

[0058] In Example 2, the magnetic permeability of the ribbon and the size of the crystalline grains were measured, wherein the grains were crystallized at the nanoscale and heat-treated the amorphous metal ribbon in nitrogen at a temperature of 380 to 620° C. 2 hours and got it. Figure 5 Showing the change in magnetic permeability with the change in heat treatment temperature, Table 2 shows the size of crystal grains according to heat treatment temperature and heat treatment time.

[0059] exist Figure 5 In , the magnetic permeability is compared according to the most suitable time, which is the magnetic permeability in the thin strip state. Only when the magnetic permeability in the ribbon state is 15000 or higher, a magnetic permeability of 125 or higher is exhibited at 100 kHz and 1 V after the core is formed.

[0060] From Figure 5 As can be seen in , a magnetic permeability of 15,000 or higher is exhibited in the range of 400 to 600°C, while no such magnetic permeab...

Embodiment 3

[0065] In the same manner as in Example 1, an amorphous thin tape was obtained. Among the powder particles of the nanoscale metal powder, 70% of the powder passes through the mesh of -100 to +140, and 30% of the powder passes through the mesh of -140 to +200. When the magnetic core is formed by an extrusion molding machine, cracks may appear on the surface of the magnetic core after the magnetic core is formed. Thus, after heat treatment, the magnetic core can crack.

[0066] If the powder passing -100 ~ +140 mesh is 65% or more, it can be seen from the experiment of changing the powder particle distribution of the metal powder that cracks will appear during the forming process and a magnetic core with the desired characteristics cannot be obtained .

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Abstract

A method for making a nano-scale amorphous soft magnetic powders obtained by thermally processing and crystallizing amorphous ribbons produced using a rapid solidification process (RSP) and crushing the same. The amorphous soft magnetic core having an excellent high-frequency characteristic is obtained by performing a preliminary thermal treatment of Fe-based amorphous metal ribbons produced by using RSP to then be converted into nano-scale grain metal ribbons, crushing the metal ribbons to thereby obtain nano-scale grain metal powders, classifying the nano-scale grain metal powders to then be mixed into a distribution of powder particles having an optimal uniform composition, mixing the mixed powder with a binder, and then forming a core, and annealing the formed core to then coat the core with an insulating resin.

Description

field of invention [0001] The present invention relates to a method for preparing nanoscale crystal grain metal powder and a method for preparing high-frequency soft magnetic cores, in particular to a method for crystallizing through heat treatment and then grinding amorphous thin strips prepared by rapid solidification (RSP) A method for preparing magnetic powder obtained by pressing, and a method for preparing a high-frequency soft magnetic core using the magnetic powder. Background technique [0002] In general, iron-based amorphous soft magnets used as conventional high-frequency soft magnets have high saturation magnetic flux density (Bs), but low magnetic permeability, large magnetic deformation, and poor high-frequency characteristics. Cobalt-based amorphous soft magnets have a low saturation magnetic flux density and have the disadvantages of expensive raw materials. If it is an amorphous soft magnetic alloy, it is difficult to form it into a strip shape, and it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00B22F3/00B22F9/00B22F9/04C21D6/00H01F41/02
CPCB22F2998/10B22F9/007B22F2999/00B22F2998/00H01F41/0226H01F1/15333B22F9/008B22F9/04B22F2201/02B22F1/052B22F1/08H01F41/02B82Y40/00
Inventor 宋容卨金希镇
Owner AMOXIANSI ELECTRONICS & ELECTRICAL CO LTD
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