Rare earth Fe-based electromagnetic shielding material and preparation method thereof

An electromagnetic shielding material, rare earth technology, applied in magnetic materials, analytical materials, material analysis using microwave means, etc., can solve the problems of poor microwave absorption characteristics, high production cost, complex preparation process, etc., and achieve good anti-oxidation ability. and anti-corrosion properties, good microwave absorption properties, and simple preparation process.

Inactive Publication Date: 2016-05-25
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing materials have poor microwave absorption characteristics in the 2-18GHz microwave band, narrow absorption frequency band, poor temperature stability, poor corrosion resistance, and low microwave absorption efficiency
[0009] The existing preparation method has complicated preparation process and high production cost, and is not suitable for industrialized production

Method used

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  • Rare earth Fe-based electromagnetic shielding material and preparation method thereof
  • Rare earth Fe-based electromagnetic shielding material and preparation method thereof
  • Rare earth Fe-based electromagnetic shielding material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 1 Shown:

[0045] Preparation of Nd 10.53 Fe 89.47 The specific implementation steps of (atomic percentage) are:

[0046] 1) Nd, Fe, and C materials with a purity equal to or greater than 99.90% are dosed according to a stoichiometric ratio of Nd:10.53% Fe:89.47%;

[0047]2) The ingredients in step 1) are alloyed and smelted in a non-consumable vacuum electric arc furnace. In order to ensure the uniformity of smelting, it is necessary to turn over and smelt repeatedly for 2 to 5 times;

[0048] 3) sealing the smelted alloy in a vacuum quartz tube for homogenization heat treatment at 900°C for 10 days;

[0049] 4) performing a quenching process on the homogenized heat-treated alloy in step 3) in an ice-water mixture;

[0050] 5) The quenched alloy is roughly crushed and then ball milled into powder; the mass ratio of zirconia balls and alloy powder in the ball milling process is 20:1, and the ball milling process requires absolute ethanol or gasoline ...

Embodiment 2

[0058] Preparation of Nd 10.53 Fe 84.21 C 5.26 The specific implementation steps of (atomic percentage) are:

[0059] 1) Nd, Fe, and C materials with a purity equal to or greater than 99.90% are dosed according to the stoichiometric ratio of Nd:10.53% Fe:84.21% C:5.26%;

[0060] 2) The ingredients in step 1) are alloyed and smelted in a non-consumable vacuum electric arc furnace. In order to ensure the uniformity of smelting, it is necessary to turn over and smelt repeatedly for 2 to 5 times;

[0061] 3) sealing the smelted alloy in a vacuum quartz tube for homogenization heat treatment at 800°C for 2 days;

[0062] 4) performing a quenching process on the homogenized heat-treated alloy in step 3) in an ice-water mixture;

[0063] 5) The quenched alloy is coarsely crushed and then ball milled into powder; the mass ratio of zirconia balls to alloy powder in the ball milling process is 15:1, and the ball milling process requires absolute ethanol or gasoline as a protective a...

Embodiment 3

[0071] Preparation of Nd 10.53 Fe 81.58 C 7.89 (Atomic percentage) concrete implementation steps:

[0072] 1) Nd, Fe, and C materials with a purity of ≥99.90% are mixed according to the stoichiometric ratio of Nd:10.53% Fe:81.58% C:7.89%;

[0073] 2) The ingredients in step 1) are alloyed and smelted in a non-consumable vacuum electric arc furnace. In order to ensure the uniformity of smelting, it is necessary to turn over and smelt repeatedly for 2 to 5 times;

[0074] 3) sealing the smelted alloy in a vacuum quartz tube for homogenization heat treatment at 1050°C for 15 days;

[0075] 4) performing a quenching process on the homogenized heat-treated alloy in step 3) in liquid nitrogen;

[0076] 5) The quenched alloy is roughly crushed and then ball milled into powder; the mass ratio of zirconia balls and alloy powder in the ball milling process is 20:1, and the ball milling process requires absolute ethanol or gasoline as a protective agent, and a ball mill is set The s...

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Abstract

The invention discloses a rare earth Fe-based electromagnetic shielding material and a preparation method thereof. The alloy comprises 10.5% of Nd, 81.6-89.5% of Fe and 0.0-7.9% of C in terms of atomic percent, and is prepared according to the following process: taking Nd, Fe and C with the purities of larger than or equal to 99.90% as raw materials, smelting in the protection of argon, performing uniform heat treatment to the alloy in vacuum at 800-1050 DEG C, quenching by using ice water / liquid nitrogen, performing ball milling after mechanically crushing, and performing tempering heat treatment at 50-300 DEG C to prepare a sample. The NdFeC electromagnetic shielding material has relatively excellent microwave absorbing property within a microwave band of 2-18GHz; when an alloy micropowder / paraffin compound has the thickness 1.8mm, the minimum absorption peak thereof can reach about -16.8dB; the electromagnetic shielding material has high microwave absorbing efficiency within the microwave band of 2-18GHz, a wide microwave absorbing band, high temperature stability and low economic cost, and has certain oxidation resistance and corrosion resistance; the electromagnetic shielding material is simple in preparation process, low in economic cost, and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of rare earth materials, and in particular relates to a rare earth Fe-based electromagnetic shielding material and a preparation method thereof. Background technique [0002] With the development of science and technology, automobiles, electronics, communications, computers and electrical equipment have entered people's lives in large numbers, and the artificial electromagnetic energy in space has increased by 7% to 14% every year. The electromagnetic waves released by a large number of electronic equipment flood the space, and electronic products are bringing people While it is convenient, it also causes invisible harm to people and the environment, and electromagnetic interference often easily leads to abnormal control of equipment, misinformation, and aircraft navigation errors, which cause serious losses to human society. Therefore, the research on electromagnetic shielding materials has been paid more and more at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C33/04C21D1/18B22F1/00B22F9/04H01F1/057H01F1/058G01N22/00
CPCC22C38/005B22F1/0003B22F9/04B22F2009/043C21D1/18C22C33/04C22C38/004G01N22/00H01F1/058
Inventor 潘顺康乔自强林培豪熊吉磊成丽春周怀营饶光辉
Owner GUILIN UNIV OF ELECTRONIC TECH
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