Iron-based nanometer crystal magnetically soft alloy and preparation method thereof

A technology of iron-based nanocrystals and soft magnetic alloys, applied in magnetic materials, magnetic objects, electrical components, etc., can solve the problems of high cost, limited application scope, inability to achieve high saturation magnetization at the same time, and reduce processing costs. The effect of easy promotion and application and excellent application prospect

Active Publication Date: 2012-07-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] NANOPERM alloy has lower comprehensive soft magnetic performance than FINEMET alloy, and because it contains a large amount of easily oxidizable noble metal element Zr, it is expensive and has a complicated preparation process, so far it has not been really popularized and applied; The addition of the noble metal element Co leads to a decrease in the comprehensive performance of the soft magnetic field and an increase in cost, and it has not been widely used so far.
In comparison, the FINEMET alloy has the best overall performance and has been widely used, but this alloy system also has obvious disadvantages: its high-frequency iron loss is relatively large, the saturation magnetization is relatively low, and the highest saturation magnetic induction The strength is only 1.4T, and Fe with better comprehensive performance 73.5 Cu 1 Nb 3 Si 13.5 B 9 The saturation magnetic induction of the alloy under the optimal annealing condition is only 1.24T, which greatly limits its application range
The preparation method is simple, but the saturation magnetic induction of the obtained alloy strip is low, the highest is only 1.2T
[0014] The above-mentioned patents have improved the soft magnetic properties of nanocrystalline alloys to varying degrees by adjusting the composition and preparation process of the alloys, but there are two obvious defects in general: (1) cannot simultaneously achieve high saturation magnetization, low Iron loss, low coercive force and high magnetic permeability; (2) The composition of the alloy contains one or more of noble metal elements such as Nb, Zr, Co, Ni, Y, etc., resulting in higher cost of the alloy

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  • Iron-based nanometer crystal magnetically soft alloy and preparation method thereof
  • Iron-based nanometer crystal magnetically soft alloy and preparation method thereof
  • Iron-based nanometer crystal magnetically soft alloy and preparation method thereof

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Embodiment 1

[0049] In this embodiment, the molecular formula of the iron-based nanocrystalline soft magnetic alloy is Fe 83.25 P 10 C 6 Cu 0.75 , the following is the specific preparation method:

[0050] Step 1: Raw materials such as Fe, P, C and Cu with a purity greater than 99% are calculated according to the alloy composition and the atomic percentage content of each composition, and the molecular formula is Fe 83.25 P 10 C 6 Cu 0.75 Perform batching, wherein C is added in the form of iron-carbon alloy, and the mass percentage of C in the iron-carbon alloy is 4.05%;

[0051] Step 2: Put the raw materials proportioned in step 1 into the ceramic crucible of the induction melting furnace, and high-frequency induction melting to obtain an alloy ingot with uniform composition;

[0052] Step 3: crush the alloy ingot obtained in step 2 and put it into a quartz tube, and use a single-roller quenching and stripping process at a rate of 35m / s in an Ar atmosphere to obtain an amorphous al...

Embodiment 2

[0060] In this embodiment, the molecular formula of the iron-based nanocrystalline soft magnetic alloy is Fe 83 P 10 C 6 Cu 1 , the following is the specific preparation method:

[0061] Step 1: Raw materials such as Fe, P, C, and Cu with a purity greater than 99% are calculated according to the alloy composition and the atomic number content of each composition, and the molecular formula is Fe 83 P 10 C 6 Cu1 Perform batching, wherein C is added in the form of iron-carbon alloy, and the mass percentage of C in the iron-carbon alloy is 4.05%;

[0062] Step 2: Put the raw materials proportioned in Step 1 into the ceramic crucible of the induction melting furnace, and high-frequency induction melting to obtain the finished product. process, the strip is thrown at a speed of 35m / s in an Ar atmosphere, and an amorphous alloy strip with a width of 1.2mm and a thickness of 23μm is produced;

[0063] Step 4: Put the amorphous alloy strip obtained in step 3 on the quartz sample...

Embodiment 3

[0069] In this embodiment, the molecular formula of the iron-based nanocrystalline soft magnetic alloy is Fe 83.5 P 10 C 6 Cu 0.5 , the preparation method is the same as in Example 1, that is, first according to the molecular formula Fe 83.5 P 10 C 6 Cu 0.5 The batching is carried out, and then put into the ceramic crucible of the induction melting furnace, and the alloy ingot with uniform composition is obtained by high-frequency induction melting; then the alloy ingot is crushed and put into the quartz tube, and the single-roller quenching and stripping process is adopted, and the alloy ingot is 35m in the Ar atmosphere. / s speed throwing strips to make amorphous alloy strips; finally, the amorphous alloy strips are placed in a rapid heating furnace, and the temperature rises to 410°C at a rate of 5°C / s in an argon atmosphere, and is kept for 5 minutes. Then it is cooled to room temperature in air to obtain iron-based nanocrystalline soft magnetic alloy.

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Abstract

The invention discloses a novel iron-based nanometer crystal magnetically soft alloy and a preparation method thereof. The molecular formula of the iron-based nanometer crystal magnetically soft alloy is FexPyCzMaCub, wherein the M in the molecular formula is one or more than one of B, Si, Al, Cr, Mn, Mo and Ge; x,y,z,a and b respectively represent atom percentage composition of each corresponding component, wherein 70<=x<=90, 1<=y<=20, 1<=z<=20, 0<=a<=10, 0.1<=b<=2, and x+y+z+a+b=100; and a microstructure is coexistence of a body-centered stand alpha-Fe nanometer crystalline phase the size of which is 5-40 nm and a rich phosphatic and carbon amorphous phase. Compared with the existing nanometer crystal magnetically soft alloy, the alloy disclosed by the invention meanwhile has the advantages of high saturation induction density, low coercive force, low iron loss and high magnetic permeability; and in addition, precious metals such as Nb, Zr, Co, Ni, Y and the like are not contained, thus the processing cost is greatly reduced and the application prospect is good.

Description

technical field [0001] The invention relates to the technical field of soft magnetic alloys, in particular to an iron-based nanocrystalline soft magnetic alloy with low cost, high saturation magnetization, low coercive force and low iron loss and a preparation method thereof. Background technique [0002] Soft magnetic materials are the first class of magnetic functional materials developed by human beings. They require magnetic properties such as high saturation magnetization, high magnetic permeability, low coercive force, and low iron loss. They are important materials widely used in the power industry and electronics industry. . From the end of the 19th century to the present, its development has experienced electrical pure iron, Fe-Si alloy (silicon steel), Fe-Ni alloy (permalloy), Fe-Al alloy, Fe-Si-Al alloy, Fe-Co alloy, soft magnet Oxygen and amorphous, nanocrystalline alloys and other systems. At present, silicon steel and soft ferrite are the most widely used sof...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147C22C45/02
Inventor 沈宝龙金云龙范星都
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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