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Iron-cobalt based nanocrystal alloy and preparation method thereof

A nanocrystalline alloy, iron-cobalt-based technology, used in magnetic materials, electrical components, circuits, etc., can solve the problem of inability to meet the requirements of high-frequency switching power supply magnetic saturation amplifier choke core use, low coercivity, high magnetic Conductivity etc.

Inactive Publication Date: 2018-06-29
QINGDAO YUNLU ADVANCED MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, cobalt-based amorphous alloy has high initial magnetic permeability and maximum magnetic permeability, high squareness ratio, low coercive force and good temperature stability. It has been industrialized and applied as a switching power supply transformer core and other materials. , but the low saturation magnetic induction of cobalt-based amorphous alloys and the high cost of raw materials greatly limit its commercial application.
[0005] In 1988, Y.Yoshizawa's research group first developed a new type of FeSiNbBCu soft magnetic material with an amorphous nanocrystalline two-phase structure (trade name FINEMET) on the basis of iron-based amorphous alloys. The Fe-Si nanocrystalline grains in this material are uniform Dispersed in the amorphous matrix, the adjacent nanocrystalline grains complete the magnetic moment exchange coupling through the interlayer amorphous layer, so the material exhibits excellent soft magnetic properties such as low coercive force and high magnetic permeability; but the iron-based nanocrystalline The rectangular ratio of the alloy is low, which cannot meet the requirements for the use of the choke coil core of the magnetic saturation amplifier of the high-frequency switching power supply

Method used

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  • Iron-cobalt based nanocrystal alloy and preparation method thereof
  • Iron-cobalt based nanocrystal alloy and preparation method thereof
  • Iron-cobalt based nanocrystal alloy and preparation method thereof

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preparation example Construction

[0037] The present application also provides a method for preparing the above-mentioned iron-cobalt-based nanocrystalline alloy, comprising the following steps:

[0038] According to the formula (Fe 1-x co x ) a m b Si c B d C e Cu f The atomic percentage distribution ratio of the iron-based amorphous alloy is batched, and the raw materials after batching are smelted;

[0039] The smelted melt is subjected to single-roll rapid quenching to obtain iron-cobalt-based amorphous alloy thin strips;

[0040] The iron-cobalt-based amorphous alloy thin strip is annealed in the first step, and the iron-cobalt-based nano-gold alloy strip that has been annealed in the first step is annealed in the second step under the action of an longitudinal magnetic field to obtain iron-cobalt-based nanocrystals alloy;

[0041] Among them, a, b, c, d, e, f and x respectively represent the atomic percentage of the corresponding component; 0.3≤x≤0.45, 70≤a≤78, 1.5≤b≤4, 12≤c≤18, 4≤d≤8, 0.5≤e≤2,...

Embodiment

[0054] (1) According to the general formula of the composition (Fe 1-x co x ) a m b Si c B d C e Cu f For batching, where a, b, c, d, e, f and x represent the atomic percentage of the corresponding components: 0.3≤x≤0.45, 70≤a≤78, 1.5≤b≤4, 12≤c≤ 18, 4≤d≤8, 0.5≤e≤2, 0.3≤f≤1.2, a+b+c+d+e+f=100. M is an element in Cr, V, Mo, Nb, Zr;

[0055] (2) According to the ingredients in the above step (1), use an intermediate frequency induction melting furnace to melt the raw materials, and the maximum temperature of the molten steel during the smelting process does not exceed 1500°C;

[0056] (3) Adjust the molten steel temperature to 150-200°C above the alloy liquidus temperature, set the initial line speed of the copper roll to 21-28m / s, and prepare an iron-cobalt-based amorphous alloy thin strip by using a single-roll rapid quenching method; The initial thickness of the strip is 27-33μm. During the process, the distance between the nozzle and the copper roller is gradually re...

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Abstract

The invention provides iron-cobalt based nanocrystal alloy shown as a formula (I), wherein x is greater than or equal to 0.3 and smaller than or equal to 0.45, a is greater than or equal to 70 and smaller than or equal to 78, b is greater than or equal to 1.5 and smaller than or equal to 4, c is greater than or equal to 12 and smaller than or equal to 18, d is greater than or equal to 4 and smaller than or equal to 8, e is greater than or equal to 0.5 and smaller than or equal to 2, f is greater than or equal to 0.3 and smaller than or equal to 1.2, and M is one or multiple of Cr, V, Mo, Nb and Zr. The invention further provides a preparation method of the iron-cobalt based nanocrystal alloy. By adding the above elements and controlling content thereof, the iron-cobalt based nanocrystal alloy has the advantages of high squareness ratio, high magnetic conductivity, low loss and low coercivity. A two-step annealing process is adopted in the process of preparing the iron-cobalt based nanocrystal alloy, so that coercivity is further lowered, magnetic conductivity is improved, and the iron-cobalt based nanocrystal alloy (Fe1-xCox)aMbSicBdCeCuf(I) having excellent magnetic performance isobtained finally.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to an iron-cobalt-based nanocrystalline alloy and a preparation method thereof. Background technique [0002] In the design of switching power supply, the output efficiency of the traditional linear regulator is low, and the output current is generally limited to 1 or 2 amperes; the efficiency of the electronic regulator is obviously improved, but the circuit cost is increased, and at the same time, the regulator is used. reliability. The principle of magnetic amplifier regulation provides a low-cost, high-efficiency, and safe and reliable solution for switching power supplies. [0003] The switching power supply magnetic amplifier choke coil requires that the magnetic core must meet the two conditions of high square ratio and low loss at the same time. The rectangular B-H loop is related to the two working states. Once the choke coil is magnetized, the switch is turned...

Claims

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Application Information

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IPC IPC(8): H01F1/153C22C38/02C22C38/10C22C38/12C22C38/14C22C38/16C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/34C22C45/02B22D11/06C21D1/26C21D6/00C22C33/04
CPCB22D11/0611C21D1/26C21D6/002C21D6/007C21D6/008C22C33/003C22C33/04C22C38/02C22C38/10C22C38/12C22C38/14C22C38/16C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/34C22C45/02H01F1/15308H01F1/15333H01F1/15341
Inventor 李长秋张世明杨东
Owner QINGDAO YUNLU ADVANCED MATERIALS TECH CO LTD
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