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Preparation method for ferrite/reductive metal composite particles and method for preparing high-temperature invisible coating layers based on laser 3D printing

A metal composite and 3D printing technology, applied in metal processing equipment, process efficiency improvement, additive manufacturing, etc., can solve the problems of unguaranteed electromagnetic performance, difficult to control microstructure, film layer/substrate bonding force, etc., achieving significant advantages , Satisfactory tissue properties, dense and complete coating

Active Publication Date: 2019-11-05
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for preparing a high-temperature stealth coating based on laser 3D printing technology to solve the problems of insufficient coating / substrate bonding force of the existing high-temperature wave-absorbing coating, difficulty in controlling the microstructure, and unguaranteed electromagnetic properties; the present invention is based on 3D Ferromagnetic / dielectric composite coating obtained by laser-induced in situ thermite reaction by printing technology
[0005] The invention integrates high temperature resistance and electromagnetic absorption performance organically, and prepares the coating in an in-situ autogenous manner, which meets the service requirements of the high temperature stealth coating and simultaneously solves the problem of the film layer / substrate binding force

Method used

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  • Preparation method for ferrite/reductive metal composite particles and method for preparing high-temperature invisible coating layers based on laser 3D printing
  • Preparation method for ferrite/reductive metal composite particles and method for preparing high-temperature invisible coating layers based on laser 3D printing
  • Preparation method for ferrite/reductive metal composite particles and method for preparing high-temperature invisible coating layers based on laser 3D printing

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Embodiment 1

[0035] Embodiment 1: The preparation method of the ferrite / reducing metal composite particles used in this example is prepared by a mixing and granulation process, and the specific preparation method is completed through the following steps:

[0036] Step 1, the particle size diameter is 80nm, spherical Fe 3 o 4 Particles, particle size diameter of 50nm, spherical Al particles and polyvinyl alcohol (PVA) additives according to Fe 3 o 4 The mass ratio to Al is 3.2:1, and the additive dosage is 0.5% of the total mass of the ferrite powder and the reducing metal powder to uniformly mix to obtain a slurry;

[0037] Step 2. The obtained slurry is granulated by centrifugal spray drying and granulation; the spray drying process parameters are as follows: the inlet temperature of the spray drying tower is 220°C, the outlet temperature of the spray drying tower is 100°C, and the spray drying tower is atomized The rotational speed of the disk was 20000r / min. After the granulation is...

Embodiment 2

[0052] Embodiment 2: In this embodiment, the method for preparing a high-temperature stealth coating based on laser 3D printing is carried out according to the following steps:

[0053] The preparation method of the ferrite / reducing metal composite particles used in this example is prepared by a mixing and granulation process, and the specific preparation method is completed through the following steps:

[0054] Step 1, the particle size diameter is 100nm, spherical BaFe 12 o 19 Particles, particle size diameter of 50nm, spherical Al particles and additives (methyl cellulose (CMC)) according to BaFe 12 o 19 The mass ratio of particles to Al particles is 3.2:1, the amount of additives is 1% of the total mass of ferrite powder and reducing metal powder, and the slurry is obtained after uniform mixing;

[0055] Step 2. The obtained slurry is granulated by centrifugal spray drying and granulation; the spray drying process parameters are: the inlet temperature of the spray dryin...

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Abstract

The invention discloses a preparation method for ferrite / reductive metal composite particles and a method for preparing high-temperature invisible coating layers based on laser 3D printing, belongs tothe technical field of wave absorption coating layer preparation, and solves the problems of insufficient coating layer / basal body bonding force of traditional high-temperature wave absorption coating layers, difficult control of microscopic structures of the coating layers and incapability of guaranteeing electromagnetic performances. Nanoscale ferrite powder and nanoscale reductive metal powderare prepared as composite particles through a mixed granulation process; in a closed preparation cavity of 3D printing equipment, the composite particles are prepared as the high-temperature invisible coating layers on the surfaces of substrates through laser induced in-situ reaction. The preparation method is applied to high-temperature invisibility and electromagnetic pollution prevention of components.

Description

technical field [0001] The invention belongs to the technical field of preparation of wave-absorbing coatings; in particular, it relates to a preparation method of ferrite / reducing metal composite particles and a method for preparing high-temperature stealth coatings based on laser 3D printing; it can be applied to high-temperature stealth of components and prevention and control of electromagnetic pollution . Background technique [0002] In the field of national defense technology, the demand for radar stealth of high-temperature components such as engines is rapidly increasing; in the field of civilian technology, with the explosive growth of the power level and application scale of radar technology and wireless communication technology, electromagnetic leakage and electromagnetic leakage caused by stray electromagnetic waves The problem of pollution has become increasingly prominent. It is shown that the application of wave-absorbing coatings on components can effective...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/10B22F3/105B33Y10/00B22F1/052B22F1/065
CPCB22F9/10B22F3/1039B33Y10/00B22F10/00B22F1/052B22F1/065C22C1/058Y02P10/25B22F10/25B33Y80/00B22F2998/10B33Y70/10B22F7/008B22F9/026B33Y40/10B22F9/20B22F2301/35B22F2304/10C22C1/053
Inventor 姜建堂管振杰杨勇甄良邵文柱
Owner HARBIN INST OF TECH
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