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Blocky iron nitride-aluminum sintered material and preparation method thereof

A technology of sintered materials and iron nitride, which is applied in the field of material science, can solve problems such as the inability to prepare dense bulk iron nitride materials, the difficulty of pressing and forming iron nitride powder, and the inability to obtain bulk iron nitride. Good application prospects, easy implementation, good strength and toughness effect

Inactive Publication Date: 2012-07-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are many methods for preparing iron nitride, mainly including gas-solid reaction, namely gas nitriding method, laser nitriding method, ion implantation method, chemical method, radio frequency magnetron sputtering and molecular beam epitaxy, etc. Different methods are required, among which the gas-solid reaction method is the most common method. Through precise parameter control, such as temperature, time, and atmosphere, almost all iron nitrides can be prepared, but the iron nitride materials prepared by the above methods are currently They are all powder, film or nitride layer materials, and it is impossible to obtain bulk iron nitride. This is mainly because iron nitride powder is difficult to press and form, and most of them are unstable phases at high temperatures, which will decompose at the sintering temperature. It is impossible to prepare dense bulk iron nitride materials by powder metallurgy, which greatly limits its application in certain volume-requiring bulk high-hardness wear-resistant materials and precision device micromachining materials.

Method used

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  • Blocky iron nitride-aluminum sintered material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 96.3% pure iron powder and 3.7% aluminum powder evenly into the mold, apply a pressure of 500MPa, and make an iron-aluminum structural prefabricated block with a porosity of 20%;

[0023] Put the prefabricated block into the nitriding furnace, feed ammonia and hydrogen, and use the ammonia flowmeter and the hydrogen flowmeter to control the flow of the two gases respectively. The volume flow ratio of ammonia and hydrogen is NH 3 :H 2 =4.6:1, the nitriding temperature is 550°C, and the temperature is kept for 5 hours to obtain a prefabricated block of ε-phase iron nitride-aluminum structure;

[0024] Raise the temperature of the nitriding furnace to 680°C, and sinter the prefabricated block for 0.5 hours to obtain a dense iron nitride-aluminum sintered material. Fe 3 Al together accounts for 1.7%, the relative density of the sintered material is 99.8%, and the hardness is 780Hv.

[0025] Microstructure photo of 96.3% iron nitride-3.7% aluminum sintered material as...

Embodiment 2

[0027] Mix 98.9% pure iron powder and 1.1% aluminum powder evenly into the mold, apply a pressure of 400MPa, and make an iron-aluminum structural prefabricated block with a porosity of 25%;

[0028] Put the prefabricated block into the nitriding furnace, feed ammonia and hydrogen, and use the ammonia flowmeter and the hydrogen flowmeter to control the flow of the two gases respectively. The volume flow ratio of ammonia and hydrogen is NH 3 :H 2 =4.6:1, the nitriding temperature is 550°C, and the temperature is kept for 1 hour to obtain a prefabricated block of ε-phase iron nitride-aluminum structure;

[0029] Raise the temperature of the nitriding furnace to 660°C, and sinter the prefabricated block for 4 hours to obtain a dense iron nitride-aluminum sintered material with a relative density of 99.5% and a hardness of 790Hv.

Embodiment 3

[0031] Mix 74.3% pure iron powder and 25.7% aluminum powder evenly into the mold, apply a pressure of 500MPa, and make an iron-aluminum structural prefabricated block with a porosity of 20%;

[0032] Put the prefabricated block into the nitriding furnace, feed ammonia and hydrogen, and use the ammonia flowmeter and the hydrogen flowmeter to control the flow of the two gases respectively. The volume flow ratio of ammonia and hydrogen is NH 3 :H 2 =2.4:1, the nitriding temperature is 550°C, and the temperature is kept for 5 hours to obtain a prefabricated block of ε and γ′ phase iron nitride-aluminum structure;

[0033] Raise the temperature of the nitriding furnace to 640°C and sinter the prefabricated block for 6 hours to obtain a dense iron nitride-aluminum sintered material with a relative density of 99.7% and a hardness of 720Hv.

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Abstract

The invention belongs to the field of material science, and particularly relates to a blocky iron nitride-aluminum sintered material and a preparation method thereof. The iron nitride-aluminum sintered material comprises the following components in percentage by mass: 24.3-98.9% of iron nitride and 1.1-75.7% of aluminum or aluminum alloy. The relative density of the iron nitride-aluminum sintered material is greater than or equal to 99.5%. The preparation method of the iron nitride-aluminum sintered material comprises the following steps: mixing 24.3-98.9% of iron powder and 1.1-75.7% of aluminum powder or aluminum alloy powder to obtain an iron-aluminum structure precast block; nitridizing to obtain an iron nitride-aluminum structure precast block; and sintering to obtain the iron nitride-aluminum sintered material. The iron nitride-aluminum s sintered material has the advantages of high hardness, high wear resistance, high strength and high toughness. The preparation method has the advantage of simple technique and is easy to implement.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a bulk iron nitride-aluminum sintered material and a preparation method thereof. Background technique [0002] Iron nitride mainly includes ε-Fe 2-3 N, γ′-Fe 4 N and α''-Fe 16 N 2 etc. Most of them have high strength and hardness. In industrial production, a hard iron nitride layer can be formed on the surface of iron and steel materials through nitriding technology, including ε, γ′ phase and alloy nitride phase, so that the surface properties of the material are greatly improved. Recent studies have shown that iron nitride can be used as an alternative material for nanoscale diamond ultra-precision machining, and has broad application prospects in the field of micromachining. In addition, iron nitride has excellent soft magnetic properties, good corrosion resistance and oxidation resistance, and is an ideal magnetic recording medium, magnetic induction element and wave-absor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/16C22C1/00
Inventor 佟伟平杨旭
Owner NORTHEASTERN UNIV