CN-117505847-B - Cobalt-based heusler alloy material and preparation method and application thereof

Abstract

The invention discloses a cobalt-based heusler alloy material, a preparation method and application thereof, wherein the preparation method comprises the following steps of (1) weighing cobalt simple substance powder, iron simple substance powder and germanium simple substance powder according to a molar ratio of (1-1.75) (0.25-1), mixing, placing the mixture in a tungsten carbide grinding tank, adding absolute ethyl alcohol, adding grinding balls, performing ball milling treatment, drying and sieving the ball-milled powder, taking the magnetic alloy powder under the sieve, sealing the magnetic alloy powder in a vacuum quartz tube, performing heat treatment by using a muffle furnace, and cooling to room temperature along with the furnace to obtain cobalt-iron-germanium heusler alloy. The invention adopts a ball milling method, can effectively change the surface morphology of the alloy powder to form flaky powder with larger specific surface area, thereby improving the electromagnetic absorption performance of the magnetic alloy, and can effectively increase the saturation magnetization of the magnetic alloy, increase the Curie temperature and improve the electromagnetic wave absorption performance of the magnetic alloy at high temperature through the selection and the proportion change of the components of the heusler alloy.

Inventors

• FENG ZHENJIE
• ZHANG YIFENG
• GAO YU
• CHE RENCHAO
• ZHANG JINCANG

Assignees

• 上海大学

Dates

Publication Date

20260505

Application Date

20231101

Claims (6)

1. 1. The preparation method of the cobalt-based heusler alloy material is characterized by comprising the following steps of: (1) Weighing cobalt simple substance powder, iron simple substance powder and germanium simple substance powder according to the molar ratio of (1-1.75) (0.25-1), mixing to obtain mixed raw material powder, placing the mixed raw material powder into a tungsten carbide grinding tank, adding absolute ethyl alcohol as a process control agent, adding grinding balls, and performing ball milling treatment; (2) Drying and sieving the ball-milling powder obtained in the step 1, sealing the magnetic alloy powder under the sieve into a vacuum quartz tube, performing heat treatment by using a muffle furnace, and cooling to room temperature along with the furnace to obtain cobalt-iron-germanium heusler alloy; the mass ratio of the grinding balls to the mixed raw material powder is 4-10:1; The grinding balls are made of tungsten carbide, the diameters of the grinding balls are respectively 10mm and 6mm, and the mass ratio of the two grinding balls is 2:1; Ball milling is carried out on the mixed raw material powder by using a high-energy planetary ball mill, the rotating speed is 300-500 rpm, the ball milling time is 30-70 hours, and the mixed raw material powder is stopped for 5-10 minutes every 30 minutes; The heat treatment temperature is 800-1000 ℃, the heat treatment temperature rising rate is 2-10 ℃ per minute, and the heat treatment time is 1-3 days.
2. 2. The method for preparing a cobalt-based heusler alloy material according to claim 1, wherein the weighing process in the step (1) is performed in an inert environment, and the purity of the cobalt simple substance powder, the iron simple substance powder and the germanium simple substance powder is above 99.99%.
3. 3. The method for preparing a cobalt-based heusler alloy material according to claim 1, wherein the ratio of the mixed raw material powder to the absolute ethyl alcohol added in the step (1) is 8-10 g/5-20 mL.
4. 4. The method for preparing a cobalt-based heusler alloy material according to claim 1, wherein the ball-milled powder in the step (2) is dried in a drying oven at 60-100 ℃ and is sieved by a 60-100 mesh sieve.
5. 5. The cobalt-based heusler alloy material prepared by the preparation method according to any one of claims 1-4.
6. 6. Use of the cobalt-based heusler alloy material according to claim 5 in electromagnetic absorption.

Description

Cobalt-based heusler alloy material and preparation method and application thereof Technical Field The application relates to the technical field of magnetic materials, in particular to a cobalt-based heusler alloy material, and a preparation method and application thereof. Background Along with the development of technology, electromagnetic wave technology and application thereof have come into various aspects of human society, and have wide application in the fields of wireless communication, biological detection and treatment, military defense and the like. However, the electromagnetic pollution also produces great pollution to human health and ecological environment. Accordingly, electromagnetic wave shielding and absorbing materials are attracting extensive interest to researchers, such as nanomaterials, composite materials, and metallic materials. Fe. Co and Ni-based alloy materials generally have higher saturation magnetization and magnetic permeability, and have great potential as electromagnetic wave absorbing materials. However, these alloy materials generally have disadvantages of corrosion resistance, oxidation resistance, insufficient high temperature stability, and the like. In 1903, an alloy composed of nonferromagnetic elements Cu, mn, al has been specially shown to be ferromagnetic, and is named Heusler alloy. The Heusler alloy has been widely studied and used today, and the reason for this ferromagnetic appearance has been revealed, but the use of Heusler alloy is still expanding. Heusler alloys can form two structures, the full Heusler and half Heusler alloys, described as XYZ and X 2 YZ, respectively, where X, Y is a transition element and Z is a main group element. Because of the unique structure of the alloy, the alloy has the characteristics of better corrosion resistance, high-temperature stability and high saturation magnetization, and therefore, the alloy has wide application prospect in the fields of spin electronic devices, electromagnetic wave absorption protection and the like. In the military war field, the wave-absorbing material can effectively reduce radar detection characteristics of high-value instrument facilities such as warplanes, warships, non-combat vehicles and the like, but the high-temperature stability and the high magnetic saturation strength of the traditional carbon-based wave-absorbing material can not meet the requirements. Therefore, how to prepare a Heusler alloy with more excellent high-temperature thermal stability and saturation magnetization is a technical problem that the skilled person is urgent to solve. Disclosure of Invention The invention aims to provide a cobalt-based heusler alloy material with strong absorption and high-temperature stability, a manufacturing method thereof and application of the alloy material in electromagnetic absorption. In order to achieve the above purpose, the invention adopts the following technical scheme: the preparation method of the cobalt-based heusler alloy material comprises the following steps: (1) Weighing cobalt simple substance powder, iron simple substance powder and germanium simple substance powder according to the molar ratio of (1-1.75) (0.25-1), mixing to obtain mixed raw material powder, placing the mixed raw material powder into a tungsten carbide grinding tank, adding absolute ethyl alcohol as a process control agent, adding grinding balls, and performing ball milling treatment; (2) And (3) drying and sieving the ball-milling powder obtained in the step (1), sealing the magnetic alloy powder under the sieve into a vacuum quartz tube, performing heat treatment by using a muffle furnace, and cooling to room temperature along with the muffle furnace to obtain the cobalt-iron-germanium heusler alloy. Preferably, the mass ratio of the grinding balls to the mixed raw material powder is 4-10:1. Preferably, the grinding balls are made of tungsten carbide, the diameters of the grinding balls are respectively 10mm and 6mm, and the mass ratio of the two grinding balls is 2:1. Preferably, the mixed raw material powder is ball-milled by using a high-energy planetary ball mill at a rotational speed of 300-500 rpm for 30-70 hours, and the mixed raw material powder is stopped every 30 minutes for 5-10 minutes to be cooled to prevent the air pressure in the tank from being too high. Preferably, the heat treatment temperature is 800-1000 ℃, the heat treatment temperature rising rate is 2-10 ℃ per minute, and the heat treatment time is 1-3 days. The purpose of the heat treatment is to reduce internal defects of the crystal caused by the ball milling process and to increase the saturation magnetization and Curie temperature thereof, thereby further improving the high-temperature thermal stability thereof. The magnetic cobalt-based heusler alloy material with high Curie temperature is obtained after heat treatment, the Curie temperature is above 1100K, and the average grain diameter is less than or equal to 20 mu m. Pref