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CN-121983406-A - Double-layer in-situ deposited amorphous powder capable of improving anti-drop performance of inductor and preparation method thereof

CN121983406ACN 121983406 ACN121983406 ACN 121983406ACN-121983406-A

Abstract

The invention belongs to the technical field of electronic component materials, and particularly discloses a double-layer in-situ deposited amorphous powder capable of improving anti-drop performance of an inductor and a preparation method thereof. The method comprises the steps of carrying out surface pretreatment on amorphous powder to clean and activate, then loading a corrosion inhibitor into pores of the powder by vacuum impregnation, and finally depositing a tough organic-polymer composite coating layer on the surface of the powder by in-situ polymerization reaction. According to the invention, by constructing a double-layer structure of combining the internal corrosion inhibitor storage layer and the external ductile polymer coating layer, the mechanical strength of the amorphous powder material and the anti-drop performance of the inductance element are remarkably improved, the coating layer of the powder body is good in integrity and not easy to damage in compression molding and subsequent processing, the structural integrity and electromagnetic performance stability of the magnetic core are effectively maintained, and the powder body is suitable for high-performance inductance elements with severe requirements on drop reliability and environmental adaptability.

Inventors

  • CHEN PENGPENG
  • HAN CUITING

Assignees

  • 安徽大学
  • 安徽安大延浩新材料科技有限公司

Dates

Publication Date
20260505
Application Date
20260211

Claims (10)

  1. 1. The preparation method of the double-layer in-situ deposited amorphous powder capable of improving the anti-dropping performance of the inductor is characterized by comprising the following steps of: (1) Surface pretreatment, namely cleaning amorphous powder, carrying out acid etching activation treatment, and then neutralizing, washing, dehydrating and drying to obtain pretreated amorphous powder; (2) The corrosion inhibitor loading, namely immersing the pretreated amorphous powder in an organic corrosion inhibitor solution, carrying out treatment under vacuum or inert atmosphere to load the organic corrosion inhibitor on the surface and pores of the powder, and carrying out post-treatment to obtain amorphous powder loaded with the organic corrosion inhibitor; (3) In-situ polymerization coating, namely dispersing the amorphous powder loaded with the organic corrosion inhibitor into an alkaline buffer solution, adding catechol compounds and amine compounds for in-situ polymerization reaction, forming a composite polymer coating layer on the surface of the powder, and performing post-treatment to obtain the double-layer in-situ deposited amorphous powder.
  2. 2. The method according to claim 1, wherein in the step (1), the acid etching activation treatment is performed using a dilute phosphoric acid solution having a mass concentration of 3% to 10%, and the treatment time is 5 to 15 seconds.
  3. 3. The method according to claim 1, wherein in the step (2), the organic corrosion inhibitor is at least one selected from benzotriazole, benzimidazole and 8-hydroxyquinoline, and the organic corrosion inhibitor solution consists of the organic corrosion inhibitor and an organic solvent, and the dosage ratio of the organic corrosion inhibitor to the organic solvent is 3-7 g/100 mL.
  4. 4. The method according to claim 1, wherein in the step (2), the loading process is performed under vacuum for 1 to 3 hours, and the operation is repeated 2 to 5 times.
  5. 5. The method according to claim 1, wherein in the step (3), the catechol compound is dopamine hydrochloride, and the amine compound is polyethyleneimine.
  6. 6. The method according to claim 1 or 5, wherein in the step (3), the mass ratio of the amorphous powder loaded with the organic corrosion inhibitor to the catechol compound is 1:0.04-0.06, and the mass ratio of the catechol compound to the amine compound is 1:0.8-1.2.
  7. 7. The method according to claim 1 or 5, wherein in step (3), the alkaline buffer solution is tris (hydroxymethyl) aminomethane buffer having a pH of 8.0 to 9.0, and the in-situ polymerization is carried out at room temperature for 5 to 8 hours.
  8. 8. A bilayer in-situ deposited amorphous powder capable of improving the anti-drop performance of an inductor, which is characterized by being prepared by the preparation method of any one of claims 1-7.
  9. 9. The double-layer in-situ deposited amorphous powder according to claim 8, comprising an amorphous powder, an organic corrosion inhibitor layer penetrating and adhering to the surface and in pores of the powder, and a composite polymer coating layer coated outside the powder and the organic corrosion inhibitor layer and formed by in-situ polymerization of catechol compounds and amine compounds.
  10. 10. An inductance component characterized in that its magnetic core contains the amorphous powder material according to any one of claims 8 to 9.

Description

Double-layer in-situ deposited amorphous powder capable of improving anti-drop performance of inductor and preparation method thereof Technical Field The invention relates to the technical field of amorphous powder preparation, in particular to a double-layer in-situ deposited amorphous powder capable of improving anti-drop performance of an inductor and a preparation method thereof Background Amorphous alloy powder has been used as a core material for magnetic elements such as high-frequency inductors and electronic transformers due to its excellent soft magnetic properties such as high magnetic permeability, low coercive force, and low high frequency loss. With the increasingly severe requirements of the fields of new energy automobiles, high-speed communication, aerospace and the like on the reliability of electronic equipment, the inductance element not only needs to work stably in a complex electromagnetic environment, but also needs to bear continuous mechanical vibration, instantaneous impact and changeable climatic environments. This presents unprecedented challenges to the mechanical strength, structural integrity, and long-term environmental compatibility of amorphous magnetic cores. However, when the existing amorphous powder is used for preparing a high-reliability inductance magnetic core, the impact resistance and mechanical properties of the amorphous powder have obvious short plates, and the amorphous powder is mainly derived from the following three fundamental problems which are related to each other: 1. Stress concentration and crack initiation risk due to intrinsic structural defects. The amorphous powder is easy to introduce internal pores and surface defects in micrometer and even submicron dimensions in the preparation process. These defects become significant stress concentration points when the powder material is pressed and subjected to impact load, and are very easy to induce nucleation and expansion of microcracks, so that brittle fracture or structural disintegration of the whole magnetic core occurs. 2. Environmental corrosion and performance degradation caused by high surface chemical activity. The amorphous structure surface atomic arrangement has high chemical activity and is easy to oxidize or electrochemically corrode in harsh environments such as humidity, salt fog and the like. The corrosion products not only can damage the integrity of the surface of the powder material and weaken the mechanical property of the powder material, but also can introduce non-magnetic impurities, so that the magnetic permeability of the magnetic core is reduced, the loss is increased, and the electromagnetic property is irreversibly attenuated. 3. The bonding force among the particles is weak to restrict the overall structural strength. In the traditional powder metallurgy process, amorphous powder particles mainly depend on physical occlusion and the bonding effect of a small amount of organic binder, and have limited bonding strength. Under frequent vibration or mechanical impact, relative sliding and even falling off are easy to occur among particles, so that the magnetic core is loose in structure and uneven in density, and the consistency of the mechanical bearing capacity and the magnetic performance is seriously damaged. To solve the above problems, a method of surface coating modification of amorphous powder is generally used in the industry. For example, an insulating layer is formed on the surface of the powder material by electroless plating, sol-gel, physical vapor deposition, or the like. However, these conventional methods often have significant limitations in that a single inorganic coating layer is brittle and is prone to cracking under compression or impact load, while a single organic polymer coating layer has the problems of weak bonding force with powder, poor heat resistance, and inability to effectively fill internal pore defects. In the prior art, collaborative promotion is difficult to realize between the optimization of the internal pores of the powder material, the interface combination strengthening and the environmental corrosion protection, so that the modified amorphous powder material often faces the dilemma of the amorphous powder material, and the harsh requirements of the high-end inductance element on the comprehensive performance cannot be completely met. Therefore, a powder modification technology for the high-drop-resistance inductor needs to be developed, the cooperative regulation and control of the amorphous powder surface and the pores are realized on the premise of not obviously sacrificing the magnetic performance and the processing formability, and an effective crack passivation and energy dissipation mechanism is provided under the impact load, so that the drop-resistance reliability of the integrated inductor is obviously improved. Disclosure of Invention The invention aims to provide a double-layer in-situ deposited amorphous powder material ca