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Novel annealing process for sheet-like Fe-based alloy powder

An annealing process and base alloy technology, applied in the furnace type, manufacturing tools, furnace, etc., can solve the problems that affect the magnetic permeability of the target product, the electromagnetic wave absorption performance, the reduction of the degree of flaking, the growth of powder particles, etc., and achieve excellent Electromagnetic wave absorption performance, improvement of bulk and tap density, and effect of large specific surface area

Active Publication Date: 2019-05-03
苏州铂韬新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual production process, in the annealing heat treatment process, it is often accompanied by the agglomeration of flake powder, resulting in the growth of powder particles, which cannot reach the expected diameter-thickness ratio, and the degree of powder deformation, distortion, and flakes is reduced, thus affecting the target. Product magnetic permeability and electromagnetic wave absorption performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A novel annealing process for flake Fe-based alloy powder, comprising the following steps:

[0026] (1) The flaky Fe-based alloy powder coarse powder obtained after drying by high-energy ball milling is uniformly mixed with nitride and oxide powder, and the flaky Fe-based alloy powder coarse powder: nitride: oxide = 1: 1:1, transferred to the annealing furnace; wherein, the Fe-based alloy powder is FeNi permalloy powder; the nitride is boron nitride, and the particle size of the boron nitride is 0.11 μm; the oxide is Magnesium oxide, and the particle size of magnesium oxide is 0.15 μm;

[0027] (2) The inert gas Ar is used for air sealing, and H is introduced into the annealing furnace. 2 , ventilation airflow 200m 3 / h, heat up to 600°C for annealing for 1h, then slowly cool down to room temperature and discharge;

[0028] (3) Transfer the mixed powder obtained after annealing to a magnetic powder sieve, and obtain the flaky Fe-based alloy powder after sifting.

Embodiment 2

[0030] A novel annealing process for flake Fe-based alloy powder, comprising the following steps:

[0031] (1) The flaky Fe-based alloy powder coarse powder obtained after drying by high-energy ball milling is uniformly mixed with nitride and oxide powder, and the flaky Fe-based alloy powder coarse powder: nitride: oxide = 1: 10:10, transferred to the annealing furnace; wherein, the Fe-based alloy powder is Fe-Si alloy powder; the nitride is silicon nitride, and the particle size of silicon nitride is 49.87μm; the oxide is aluminum oxide , and the particle size of alumina is 49.77μm;

[0032] (2) The inert gas Ar is used for air sealing, and H is introduced into the annealing furnace. 2 , ventilation airflow 600m 3 / h, annealing at 1200°C for 2 hours, and then slowly cooling down to room temperature before discharging;

[0033] (3) Transfer the mixed powder obtained after annealing to a magnetic powder sieve, and obtain the flaky Fe-based alloy powder after sifting.

Embodiment 3

[0035] A novel annealing process for flake Fe-based alloy powder, comprising the following steps:

[0036] (1) The flaky Fe-based alloy powder coarse powder obtained after drying by high-energy ball milling is uniformly mixed with nitride and oxide powder, and the flaky Fe-based alloy powder coarse powder: nitride: oxide = 1: 6:6, transferred to the annealing furnace; wherein, the Fe-based alloy powder is Sendust alloy powder; the nitride is aluminum nitride, and the particle size of the aluminum nitride is 20.63 μm; the oxide is silicon oxide , and the particle size of silicon oxide is 32.06 μm;

[0037] (2) The inert gas Ar is used for air sealing, and H is introduced into the annealing furnace. 2 , ventilation airflow 400m 3 / h, heat up to 900°C and anneal for 1.5h, then slowly cool down to room temperature and discharge;

[0038] (3) Transfer the mixed powder obtained after annealing to a magnetic powder sieve, and obtain the flaky Fe-based alloy powder after sifting. ...

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Abstract

A novel annealing process for sheet-like Fe-based alloy powder comprises the steps of: (1) uniformly mixing a sheet-like Fe-based alloy coarse powder obtained by high-energy ball milling and drying with nitride powder and oxide powder, and transferring the mixture to an annealing furnace; (2) H2 is introduced into the annealing furnace at the airflow of 200-600 m<3> / h, the temperature is raised to600-1200 DEG C, and the mixture is annealed for 1-2 h and then slowly drops to room temperature and is discharged; (3) the mixed powder obtained after annealing is transferred to a magnetic powder filter, and the sheet-like Fe-based alloy powder is obtained after filtering. As for the sheet-like powder treated by the novel annealing process, obvious change of the shape of the powder caused by theheat treatment process is avoided; the looseness and tap density are improved accordingly; the morphology is more regular; and the powder tends to be flattened, and has the excellent electromagneticwave absorption performance.

Description

technical field [0001] The invention belongs to the technical field of flake powder production and relates to a novel annealing process for flake Fe-based alloy powder Background technique [0002] In recent years, with the rapid development of radio, television, microwave communication and other technologies, the power of radio frequency equipment has doubled, and the electromagnetic radiation on the ground has increased significantly. Facing the arrival of the 5G era, the problem of electromagnetic pollution will become more and more closely related to people's lives. Commonly used electrical appliances such as mobile phones, induction cookers, electronic instruments, medical equipment and other equipment will be flooded with electromagnetic waves of different wavelengths and frequencies generated during their work. Space, when the intensity of electromagnetic radiation exceeds the limit that the human body can bear or the limit that instruments and equipment can tolerate,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/74C21D9/00B22F1/00
Inventor 袁兴平杨爽王建斌刘慧远李建波
Owner 苏州铂韬新材料科技有限公司
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