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Preparation method of oxidized graphene coated Ni-Co alloy particle composite material

A technology of graphene coating and composite materials, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of narrow absorption frequency band, poor impedance matching characteristics, and limited use range, etc., to achieve improved impedance matching and good temperature stability , Improve the effect of complex permittivity

Active Publication Date: 2017-01-04
EAGLES MEN AERONAUTIC SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention adopts hydrothermal reaction to prepare composite particles in one step, and Ni-Co alloy particles are not coated, and the impedance matching characteristics with air are poor, resulting in a narrow absorption frequency band, which limits its application range

Method used

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  • Preparation method of oxidized graphene coated Ni-Co alloy particle composite material
  • Preparation method of oxidized graphene coated Ni-Co alloy particle composite material
  • Preparation method of oxidized graphene coated Ni-Co alloy particle composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Weigh 3.41g of nickel carbonyl and 3.42g of cobalt carbonyl and dissolve them in 50mL of isopropanol and 1mL of amino-terminated polyurethane in an aqueous solution; then add 1mL of γ-aminopropyltriethoxysilane as a surface treatment agent for the mixed particles , Ultrasonic dispersion for 0.5h, to obtain a uniformly mixed nickel carbonyl and cobalt carbonyl mixed solution.

[0030] Step 2: Weigh 2g graphite powder and place it in a 250mL beaker, add 10mL concentrated nitric acid, 5mL concentrated sulfuric acid, then add 5g potassium permanganate, ultrasonically disperse for 10min, wash with deionized water three times, add 5mL concentrated ammonia water and ultrasonically disperse for 10min, After centrifugal washing for 2 times, add 10mL hydrogen peroxide solution and ultrasonically disperse for 10min, centrifuge and wash twice, add 5mL concentrated hydrochloric acid and ultrasonically disperse for 10min, wash twice, then add 10mL absolute ethanol and ultrason...

Embodiment 2

[0040] Step 1: Weigh 6.82g of nickel carbonyl and 6.84g of cobalt carbonyl and dissolve them in 100mL of isopropanol and 2mL of amino-terminated polyurethane in an aqueous solution to obtain a mixed solution; then add 1mL of γ-aminopropyltriethoxysilane as mixed particles surface treatment agent, and ultrasonically disperse for 0.5h to obtain a mixed solution of nickel carbonyl and cobalt carbonyl that is uniformly mixed.

[0041]Step 2: Weigh 4g of graphite powder into a 500mL beaker, add 20mL of concentrated nitric acid, 10mL of concentrated sulfuric acid, then add 10g of potassium permanganate, ultrasonically disperse for 20min, wash with deionized water three times, add 10mL of concentrated ammonia water and ultrasonically disperse for 10min, After centrifugal washing for 2 times, add 20mL hydrogen peroxide solution and ultrasonically disperse for 10min, centrifugally wash twice, add 10mL concentrated hydrochloric acid and ultrasonically disperse for 10min, wash twice, then...

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Abstract

The invention relates to the field of stealth materials, in particular to a preparation method of an oxidized graphene coated Ni-Co alloy particle composite material. The preparation method comprises the following steps: step one, preparation of oxidized graphene; step two, thermal decomposition of nickel carbonyl and cobalt carbonyl mixed liquid to prepare Ni-Co alloy particles; step three, dropwise adding of the oxidized graphene in the thermal decomposition process of the mixed liquid; step four, preparation of oxidized graphene coated Ni-Co alloy powder. The oxidized graphene coated Ni-Co alloy particle composite material prepared with the method has the advantages that the magnetic conductivity is high, the temperature stability is good, the antioxidation and the acid and alkali resistance are excellent and the like, the effective absorption broadband of the composite material is 9.5-14.6 GHz, the composite material has the maximum absorption value of 16.5 dB at the 12 GHz when the thickness is 1.5 mm, the impedance matching is remarkably improved after compounding, and the composite material has an excellent adsorption effect.

Description

technical field [0001] The invention relates to the field of stealth materials, in particular to a method for preparing a graphene oxide-coated Ni-Co alloy particle composite material. Background technique [0002] The ultra-fine metal powder in the traditional wave absorbing agent has high magnetic permeability, but the impedance matching characteristics with the air is not good, and the absorption bandwidth is narrow and the density is high, which limits its wider application in the field of wave absorption. Use new materials to combine with traditional wave-absorbing materials to improve the absorption performance of electromagnetic waves. Graphene is a two-dimensional carbon material formed by hexagonal stacking of single-layer carbon atoms, which has an ideal lattice structure and unique electrical, optical, mechanical and thermal properties. The graphene prepared by the chemical reduction method still has a large number of defects and functional groups, which can enha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/30B22F1/02
CPCB22F9/305B22F1/16
Inventor 高志猛彭钜锴刘敏
Owner EAGLES MEN AERONAUTIC SCI & TECH GRP
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