Mnal alloy magnetic wave-absorbing material and preparation method thereof

A magnetic wave-absorbing and alloy technology, which is applied in the field of MnAl alloy magnetic wave-absorbing materials and its preparation, can solve the problems of high density, poor temperature stability, and easy corrosion of magnetic wave-absorbing materials, and achieve wide absorption frequency band and good temperature stability , Good anti-oxidation and corrosion resistance

Active Publication Date: 2015-07-29
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rare earth intermetallic compound magnetic wave-absorbing material has a high density (about 7.3g / cm 2 ), easy to corrode, poor temperature stability and other shortcomings, so it will be limited in practical application

Method used

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  • Mnal alloy magnetic wave-absorbing material and preparation method thereof
  • Mnal alloy magnetic wave-absorbing material and preparation method thereof
  • Mnal alloy magnetic wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Formulation: Mn 71 Al 29 (atomic percent).

[0031] 2. Specific implementation steps:

[0032] 1) Mn and Al metals with a purity ≥ 99.50% are used as Mn 71 Al 29 The stoichiometric ratio of the molecular formula is used as the benchmark, and 5% (atomic fraction) of Mn and 12% (atomic fraction) of Al are added to the ingredients;

[0033] 2) Smelting in a standard electric arc furnace under the protection of argon, in order to ensure that the composition of the alloy is uniform, repeatedly turning and melting 4 times;

[0034] 3) Keep the smelted ingot under the protection of argon at 1000°C for 48 hours and then water quench;

[0035] 4) Measure material density;

[0036] 5) Break the obtained alloy ingot into coarse powder with a particle size of less than 0.5mm, then put the zirconia ball and coarse powder into the zirconia tank at a mass ratio of 15:1, add ethanol as a protective agent, and use QM-lSP The planetary ball mill mills the alloy coarse powder fo...

Embodiment 2

[0044] 1. Formulation: Mn 55 Al 45 (atomic percent).

[0045] 2. Specific implementation steps:

[0046] 1) Mn and Al metals with a purity ≥ 99.50% are used as Mn 55 Al 45 The stoichiometric ratio of the molecular formula is used as the benchmark, and 5% (atomic fraction) of Mn and 12% (atomic fraction) of Al are added to the ingredients;

[0047] 2) Melting in an electric arc furnace under the protection of argon, in order to ensure that the composition of the alloy is uniform, the melting is repeated 4 times;

[0048] 3) The smelted ingot is kept at 950°C for 70 hours under the protection of argon, and then water quenched;

[0049] 4) Measure material density;

[0050] 5) Break the obtained alloy ingot into coarse powder with a particle size of less than 0.5mm, then put the zirconia ball and coarse powder into the zirconia tank at a mass ratio of 12:1, add ethanol as a protective agent, and use QM-lSP The planetary ball mill milled the alloy coarse powder for 36 hours...

Embodiment 3

[0056] 1. Formulation: Mn 38 Al 62 (atomic percent).

[0057] 2. Specific implementation steps:

[0058] 1) Mn and Al metals with a purity ≥ 99.50% are used as Mn 38 Al 62 The stoichiometric ratio of the molecular formula is used as the benchmark, and 5% (atomic fraction) of Mn and 12% (atomic fraction) of Al are added to the ingredients;

[0059] 2) Melting in an electric arc furnace under the protection of argon, in order to ensure that the composition of the alloy is uniform, flipping and melting 4 times;

[0060] 3) Keep the smelted ingot at 1050°C for 36 hours under the protection of argon and then water quench;

[0061] 4) Measure material density;

[0062] 5) Break the obtained alloy ingot into a coarse powder with a particle size of less than 0.5mm, then put the zirconia ball and the coarse powder into a zirconia tank at a mass ratio of 19:1, add ethanol as a protective agent, and use QM-lSP The planetary ball mill milled the alloy coarse powder for 12 hours, an...

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Abstract

A MnAl alloy magnetic absorbing material provided by the invention comprises atoms in the following percentage: 37-72% of Mn and 28-63% of Al. The absorbing material is prepared by a method comprising the following steps: melting raw materials of metal Mn and Al with purity no less than 99.50% under protection of argon; carrying out uniformization treatment on cast ingots at 900-1100 DEG C in vacuum or under protection of argon; milling the cast ingots; and carrying out tempering heat treatment at 200-600 DEG C. The MnAl alloy magnetic absorbing material has characteristics of small density, good microwave absorption characteristics in microwave band of 2-18 GHz, wide frequency band of absorption, good oxidation resistance, corrosion resistance and temperature stability, does not contain strategic metal elements like Co, Ni and rare earths, simple preparation technology, abundant raw materials and low price. Among the magnetic absorbing materials, the MnAl alloy magnetic absorbing material provided by the invention is more suitable for preparation of microwave absorption products with wide frequency band of absorption, high absorbing efficiency, small material density, good oxidation resistance, corrosion resistance and temperature stability, and low cost.

Description

technical field [0001] The invention belongs to the field of microwave materials, in particular to a magnetic wave-absorbing material, more specifically to a MnAl alloy magnetic wave-absorbing material and a preparation method thereof. Background technique [0002] The application of microwave electromagnetic technology has created material civilization for society, but it also brings people into an environment full of electromagnetic radiation. In order to solve the harm caused by electromagnetic radiation, people have done a lot of research work. Among them, in the microwave band (especially in the 2-18GHz frequency band), magnetic wave-absorbing materials are used to guide electromagnetic waves. Through resonance, a large amount of radiation energy of electromagnetic waves is absorbed, and then the energy of electromagnetic waves is converted into heat energy through coupling, which can well suppress electromagnetic waves. radiation and interference. For example, if mag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C22/00C22C30/00
Inventor 林培豪潘顺康刘烨饶光辉周怀营杨涛朱保华成丽春
Owner GUILIN UNIV OF ELECTRONIC TECH
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