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A kind of nanometer iron nitride wave absorbing material with multi-scale grains and preparation method thereof

An iron nitride absorption, multi-scale technology, applied in metal material coating process, solid diffusion coating, coating and other directions, can solve the problem of low total grain boundary area of ​​particles, thick absorbing matching thickness, low scattering frequency, etc. problem, to achieve the effect of simple generation equipment, thin absorbing matching thickness, and wide absorbing frequency

Active Publication Date: 2020-07-14
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This iron nitride microwave absorbing material powder has the advantages of complex particle surface structure, large overall specific surface area and uniform particle size, but its internal grain size is usually micron-scale grains, and the grain distribution is uniform. Low total internal grain boundary area
Although the electromagnetic wave can reduce the occurrence of reflection when it enters the interior from the surface of the particle, the frequency of electromagnetic wave scattering during the internal transmission of the particle is relatively low, resulting in poor wave-absorbing performance, narrow wave-absorbing frequency band, and thick wave-absorbing matching thickness

Method used

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  • A kind of nanometer iron nitride wave absorbing material with multi-scale grains and preparation method thereof
  • A kind of nanometer iron nitride wave absorbing material with multi-scale grains and preparation method thereof
  • A kind of nanometer iron nitride wave absorbing material with multi-scale grains and preparation method thereof

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Effect test

Embodiment 1

[0036] A preparation method of a nano-iron nitride wave-absorbing material with multi-scale crystal grains, comprising the following steps:

[0037] Step 1: Prepare ferroalloy powder material to be nitrided

[0038] According to the chemical composition of the raw material, weigh the raw material, and use the vacuum atomization powder making equipment to make the raw material into a ferroalloy powder with uniform composition to be nitrided. The average particle size is 50-100 μm; the chemical composition ratio of the raw material is according The mass percentage is: Fe is 99.995%, and the balance is unavoidable impurities;

[0039] Step 2: Nitriding

[0040] Use a gas nitriding furnace to carry out gas nitriding treatment on ferroalloy powder to be nitrided at 480°C to obtain the nitrided material. Use a programmable nitrogen potential controller to control the reaction nitrogen potential, and the nitriding potential is controlled to 1.6 , the nitriding time is 10h;

[0041...

Embodiment 2

[0051] A preparation method of a nano-iron nitride wave-absorbing material with multi-scale crystal grains, comprising the following steps:

[0052] Step 1: Prepare ferroalloy powder material to be nitrided

[0053] According to the chemical composition of the raw materials, the raw materials are weighed, and the raw materials are made into ferroalloy powder to be nitrided by vacuum atomization pulverization equipment. Cr: 10%, Ni: 10%, the balance is Fe and unavoidable impurities;

[0054] Step 2: Nitriding

[0055] Use a gas nitriding furnace to carry out gas nitriding treatment on the iron alloy powder material to be nitrided at 650°C to obtain the nitrided material, and use a programmable nitrogen potential controller to control the reaction nitrogen potential. The nitriding potential is controlled to 0.8, and the nitriding Nitrogen time is 5h;

[0056] Step 3: High Energy Ball Milling

[0057] Put the nitrided material into the ball mill tank, and fill it with high-pu...

Embodiment 3

[0063] A preparation method of a nano-iron nitride wave-absorbing material with multi-scale crystal grains, comprising the following steps:

[0064] Step 1: Prepare ferroalloy powder material to be nitrided

[0065] According to the chemical composition of the raw materials, the raw materials are weighed, and the raw materials are made into ferroalloy powder to be nitrided by vacuum atomization pulverization equipment, with a particle size of 50-100 μm; wherein, the chemical composition ratio of the raw materials is as follows: Mo: 5%, Mn: 2%, the balance is Fe and unavoidable impurities;

[0066] Step 2: Nitriding

[0067] Use a gas nitriding furnace to carry out gas nitriding treatment on the iron alloy powder material to be nitrided at 640°C to obtain the nitrided material. Use a programmable nitrogen potential controller to control the reaction nitrogen potential. The nitriding potential is controlled at 0.4, Nitrogen time is 8h;

[0068] Step 3: High Energy Ball Millin...

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Abstract

The invention discloses a nanometer iron nitride wave absorbing material with multiscale grains and a preparation method thereof, and belongs to the field of nanometer wave absorbing material preparation. The nanometer iron nitride wave absorbing material with multiscale grains comprises the following chemical components in percentage by mass: 0.1-12% of N, 0-9% of Cr, 0-10% of Ni, 0-5% of Mo, 0-2% of Mn, and the balance of Fe and inevitable impurities; the mass ratio of the included grains of micron-scale grains and submicron-scale grains to nanoscale grains to microstructures is (90-100): (9-85): (1-5); and the microstructures are not more than 5%. The preparation method comprises mixing of raw materials, nitriding of materials to be nitrided of iron alloy powder and high-energy ball milling to obtain the nanometer iron nitride wave absorbing material with multiscale grains. The material is provided with the grains with multiple different scales, so that the scattering times of electromagnetic waves in the process of transmitting in particles are increased, the wave absorbing capacity of the material is improved, meanwhile, the wave absorbing frequency band is wide, and the waveabsorbing matching thickness is small.

Description

technical field [0001] The invention belongs to the field of preparation of nano wave-absorbing materials, and in particular relates to a nano-iron nitride wave-absorbing material with multi-scale crystal grains and a preparation method thereof. Background technique [0002] Due to the increasingly widespread application of microwave technology in industrial production and military fields, the important value of microwave-absorbing materials has become increasingly prominent. The use of wave-absorbing materials in civilian equipment can reduce the physical harm caused by electromagnetic radiation; the use of wave-absorbing materials in military equipment can interfere with the detection of electromagnetic waves and effectively improve the stealth effect of equipment, which has important strategic significance. At present, the research and development of absorbing materials are mainly focused on thin thickness, light weight, wide absorbing frequency and strong absorbing abili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/12C22C38/22C22C38/38C22C38/44C22C38/58C23C8/26H05K9/00B22F9/08
CPCB22F9/082C22C38/001C22C38/04C22C38/12C22C38/22C22C38/38C22C38/44C22C38/58C23C8/26H05K9/0081
Inventor 佟伟平宫梦莹
Owner NORTHEASTERN UNIV LIAONING
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