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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

A nano-iron nitride absorbing material with multi-scale crystal grains and a preparation method thereof, belonging to the field of nano-absorbing material preparation. The chemical composition and mass percentage of the nano-iron nitride absorbing material with multi-scale crystal grains are: N: 0.1~12%, Cr: 0~9%, Ni: 0~10%, Mo: 0~ 5%, Mn: 0~2%, the balance is Fe and unavoidable impurities; the grains included, according to mass ratio, micron-sized grains and sub-micron-sized grains: nano-sized grains: amorphous = ( 90~10): (9~85): (1~5); Amorphous ≤ 5%. The preparation method is: mixing the raw materials, nitriding the iron alloy powder to be nitrided, and then high-energy ball milling to obtain a nano-iron nitride absorbing material with multi-scale grains. The material has a variety of crystals of different scales inside. particles, which increases the number of scatterings of electromagnetic waves during transmission inside the particles, improving the material's absorbing ability. At the same time, the absorbing frequency is wide and the absorbing matching thickness is thin.

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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