阅读说明：本技术 一种铁氧体/高聚物复合吸波材料及其制备方法与应用 (ferrite/high polymer composite wave-absorbing material and preparation method and application thereof ) 是由 刘毅 沈灿铎 于 2019-11-21 设计创作，主要内容包括：本发明公开了一种铁氧体/高聚物复合吸波材料及其制备方法与应用。吸波材料为铁氧体与高聚物构成的复合材料,铁氧体属磁铅石结构铁氧体,是主要吸波组分,采用烧结工艺制备。高聚物是聚乙烯等高分子材料,复合材料采用物理包覆法制备,以高聚物为核心,将铁氧体包覆在高聚物表面,形成复合吸波材料。本发明制备的复合吸波材料可通过热喷涂制备吸波涂层,利用高聚物保护铁氧体,降低铁氧体受热熔融程度,提高磁铅石相结构在涂层中的含量,增强涂层吸波性能。(The invention discloses ferrite/high polymer composite wave-absorbing material and a preparation method and application thereof, wherein the wave-absorbing material is a composite material formed by ferrite and high polymer, the ferrite belongs to magnetoplumbite structural ferrite and is a main wave-absorbing component, the ferrite is prepared by adopting a sintering process, the high polymer is a high polymer material such as polyethylene, the composite material is prepared by adopting a physical coating method, the high polymer is taken as a core, and the ferrite is coated on the surface of the high polymer to form the composite wave-absorbing material.)

1, kinds of ferrite/high polymer composite wave-absorbing material, which is core-shell structure, the core is high molecular polymer, and the shell layer is magnetoplumbite structure ferrite layer.

2. The ferrite/high polymer composite wave-absorbing material of claim 1, wherein: the ferrite/high polymer composite wave-absorbing material is spherical-like particles, and the particle size of the particles is 30-150 mu m.

The magnetoplumbite structure ferrite is coated on the surface of the high molecular polymer by adopting a physical coating method.

3. The ferrite/high polymer composite wave-absorbing material of claim 1 or 2, wherein: the particle size of the high molecular polymer is 20-150 mu m; the average grain size of the magnetoplumbite structure ferrite is 0.5-50 mu m.

4. The ferrite/high polymer composite wave-absorbing material of any of claims 1-3, wherein the high molecular polymer is high density polyethylene.

5. The ferrite/polymer composite wave-absorbing material of any of claims 1-4, wherein the magnetoplumbite-structured ferrite is coated on the surface of the high molecular polymer by a physical coating method.

6. The preparation method of the ferrite/high polymer composite wave-absorbing material of any of claims 1-5, comprising the steps of preparing by a physical coating method, coating the high polymer with a magnetoplumbite-structured ferrite as coating powder by using an adhesive with the high polymer as a core to form spheroidal particles, and sieving to obtain the ferrite/high polymer composite wave-absorbing material.

7. Use of the ferrite/polymer composite wave-absorbing material of any in claims 1-6 for preparing wave-absorbing coating.

8. Use according to claim 7, characterized in that: the wave-absorbing coating is prepared by adopting a thermal spraying method.

Technical Field

The invention belongs to the technical field of wave-absorbing materials, and particularly relates to ferrite/high polymer composite wave-absorbing materials, and a preparation method and application thereof.

Background

The wave-absorbing material is hotspots of stealth technical research, the ferrite wave-absorbing material is class wave-absorbing material which is researched earlier, the mechanism of absorbing electromagnetic waves is mainly electromagnetic loss and dielectric loss, the ferrite wave-absorbing material has better wave-absorbing performance, and application is achieved.

The preparation method of the wave-absorbing coating by thermal spraying is a novel wave-absorbing coating preparation process appearing in recent years, the wave-absorbing coating prepared by thermal spraying has high bonding strength, organic components such as adhesive and the like are not used, and the preparation method is favorable for solving the problems of the coating process.

Disclosure of Invention

The invention aims to improve the content of magnetoplumbite phase in a thermal spraying ferrite coating, and provides a method for protecting ferrite by adopting a high polymer and constructing a ferrite/high polymer composite wave-absorbing material, so that the ferrite is prevented from being excessively molten in the high-temperature thermal spraying process, and more magnetoplumbite phase can be reserved in the coating.

In order to realize the technical problem, the technical scheme adopted by the invention is as follows:

kinds of ferrite/high polymer composite wave-absorbing material, which is core-shell structure, the core is high molecular polymer, and the shell layer is magnetoplumbite structure ferrite layer.

The magnetoplumbite structure ferrite is coated on the surface of the high molecular polymer by adopting a physical coating method.

The ferrite/high polymer composite wave-absorbing material is spherical-like particles, and the particle size of the particles is 30-150 mu m.

Wherein the particle size of the high molecular polymer is 20-150 μm, and the average particle size of the magnetoplumbite ferrite forming the magnetoplumbite ferrite layer is 0.5-50 μm.

The high molecular polymer of the invention is high density polyethylene (such as density 0.94 g/cm)³) The function of the utility model is: ferrite/high polymer composite wave-absorbing material prepared by thermal sprayingIn the process of wave coating, the high polymer absorbs part of heat of thermal spraying flame flow, so that part of ferrite is not fully melted, and a magnetoplumbite phase structure is reserved and deposited in the coating. The high polymer protects the ferrite, so that the content of a magnetoplumbite phase in the coating is improved, and the wave-absorbing performance of the coating is enhanced.

The magnetoplumbite structure ferrite is prepared by an oxide sintering method according to chemical compositions. It is the main wave-absorbing component.

The invention also provides a preparation method of the ferrite/high polymer composite wave-absorbing material.

The ferrite/high polymer composite wave-absorbing material is prepared by adopting a physical coating method, taking a high molecular polymer as a core, using a small amount of adhesive, coating the high molecular polymer with magnetic plumbite structure ferrite as coating powder to form spheroidal particles, and screening to obtain the ferrite/high polymer composite wave-absorbing material.

Wherein, the adhesive can be selected from commercial adhesives known by those skilled in the art.

The ferrite/high polymer composite wave-absorbing material provided by the invention can be used for preparing a wave-absorbing coating by thermal spraying.

Due to the adoption of the technical scheme, the invention has the following advantages:

(1) the invention provides ferrite/high polymer composite wave-absorbing materials suitable for thermal spraying, wherein the high polymer absorbs partial heat of thermal spraying flame flow, so that the excessive heating and melting of ferrite are reduced, the magnetoplumbite phase structure of the ferrite is protected, and the content of the magnetoplumbite phase structure in a coating is increased.

(2) The surface density of the ferrite/high polymer composite wave-absorbing material is lower than that of the ferrite material, which is beneficial to preparing the light wave-absorbing coating.

Drawings

FIG. 1 is a diagram of a ferrite/high polymer composite wave-absorbing material prepared by the present invention.

FIG. 2 shows a ferrite/polymer composite coating prepared by plasma spraying.

Detailed Description

The present invention is described below with reference to specific embodiments, but the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.

Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.

Reference is made to GB/T1479.1-2011 "determination of bulk Density of Metal powders part 1: funnel method.

The fluidity in the following examples was measured in terms of the time required for doses of the powder to flow through a calibrated funnel of defined pore size, usually in units of s/50 g.