Heat treatment method for preparing nanocrystalline alloy

A technology of nanocrystalline alloy and heat treatment method, which is applied in the field of heat treatment of nanocrystalline alloy prepared by amorphous crystallization method, can solve the problems of unfavorable magnetic properties, uneven heating of inner and outer layers of magnetic core, etc., and achieves the promotion of grain refinement, The effect of excellent toughness

Inactive Publication Date: 2017-01-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Description
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  • Application Information

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Problems solved by technology

However, when the crystallization heat treatment is carried out for a slightly larger-sized magnetic core, the use of a high heating rate will easily lead to uneven heating of the inner and outer layers of the magnetic core, which is not conducive to obtaining uniform magnetic properties.

Method used

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  • Heat treatment method for preparing nanocrystalline alloy
  • Heat treatment method for preparing nanocrystalline alloy
  • Heat treatment method for preparing nanocrystalline alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of Nanocrystalline Alloy Fe by Amorphous Crystallization 83 Si 4 B 12 Cu 1 , including the following steps.

[0050] (1) Select Fe 83 Si 4 B 12 Cu 1 Alloy, the strip is prepared by rapid quenching and solidification at a high copper roll speed of 35m / s;

[0051] The microstructure of the strip was detected by XRD, such as Figure 5 As shown, the ribbon is completely amorphous.

[0052] The crystallization temperature of the strip was detected by DSC at a heating rate of 40°C / min. Such as Figure 6 As shown, the first crystallization start temperature is 393°C, the first crystallization end temperature is 438°C, and the second crystallization start temperature is 522°C. According to the DSC diagram, it is determined that the optimum nucleation temperature range is 450-510°C, and the optimum grain growth temperature range is 400-430°C.

[0053] (2) Preheat the strip with a rapid heating furnace, specifically: heat the strip to 490° C. and then keep...

Embodiment 2

[0063] Preparation of Nanocrystalline Alloy Fe by Amorphous Crystallization 83 Si 4 B 12 Cu 1 , including the following steps.

[0064] (1) Select Fe 83 Si 4 B 12 Cu 1 Alloys were rapidly quenched and solidified at a low copper roll speed of 25m / s to prepare strips.

[0065] The microstructure of the strip was detected by XRD, such as Figure 5 As shown, there has been obvious crystallization of the free surface of the strip.

[0066] Use DSC to detect the crystallization temperature of the strip at a heating rate of 40°C / min, such as Figure 6 As shown, the first crystallization start temperature is 353°C, the first crystallization end temperature is 443°C, and the second crystallization start temperature is 521°C. According to the DSC diagram, it is determined that the optimum nucleation temperature range is 450-510°C, and the optimum grain growth temperature range is 360-440°C.

[0067] (2) Preheating the strip with a rapid heating furnace, specifically: heat the...

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Abstract

The invention discloses a heat treatment method for preparing nanocrystalline alloy. According to the method, during the nanocrystalline alloy material preparation by an amorphous crystallization method, a heat treatment process is divided into two steps; in the first step, the characteristics of high heat conductivity and low heat capacity of an amorphous crystallization alloy belt material are used; the fast temperature rise and short-time heat insulation pre-heating treatment is performed; high-density and uniformly-distributed crystal nucleuses are formed in the belt material through excitation; then, in the second step of conventional nano-crystallization heat treatment, high-density crystal particles grow synchronously; the competitive effect between the crystal particles is used for promoting the crystal particle refining. Compared with the existing heat treatment method, the method has the advantages that amorphous crystallization nucleation and crystal particle growth processes are controlled in a separated way; the crystal particle density and the crystallization degree are improved; the crystal particle dimension and the distribution uniformity are improved; in addition, the crystal particles are refined, so that the performance of the alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of nanocrystalline alloy materials, and in particular relates to a heat treatment method for preparing nanocrystalline alloys by using an amorphous crystallization method. Background technique [0002] As functional materials, soft magnetic materials play an extremely important and irreplaceable role. The research, development, production and application of new soft magnetic materials with excellent performance are of great significance to the development of my country's high-tech industries, the promotion of traditional industries, and the development of related industries. Modern power electronics technology is developing in the direction of energy saving, high efficiency, high power and small size, which constantly poses new challenges and development opportunities for the development of soft magnetic materials. The development of soft magnetic materials with high saturation magnetic induction, high perm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C22F1/00
Inventor 王安定常春涛赵成亮门贺王新敏贺爱娜
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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