High-temperature-resistant flaky iron-cobalt-germanium wave absorption material and preparation method and application thereof

A wave-absorbing material and high-temperature-resistant technology, which is applied in the field of wave-absorbing materials, can solve the problems of high hardness of FeCo alloy, thick wave-absorbing coating, and difficult to break, and achieve high usable temperature, low absorption frequency, Effect of High Curie Temperature

Active Publication Date: 2021-11-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is: to propose a high-temperature-resistant sheet-shaped iron-cobalt-germanium absorbing material with excellent wave-absorbing performance and its preparation method and application, to overcome the problem of high hardness and difficult to break of FeCo alloy, and to solve the problem of wave-absorbing at low frequencies The problem of thick coating and poor microwave absorption performance at high temperature

Method used

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  • High-temperature-resistant flaky iron-cobalt-germanium wave absorption material and preparation method and application thereof
  • High-temperature-resistant flaky iron-cobalt-germanium wave absorption material and preparation method and application thereof
  • High-temperature-resistant flaky iron-cobalt-germanium wave absorption material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Ge-doped flaky Fe in this example 6.5 co 3.5 Ge x (x=0.2), its preparation method comprises the following steps:

[0044] (1) Using an electronic balance with an accuracy of 0.1mg, the stoichiometric ratio is 6.5:3.5:0.2, and weigh 3.1091g iron particles (99.9% purity), 1.7665g cobalt flakes (99.9% purity) and 0.1244g germanium Granules (purity: 99.9%), the error is within 0.5mg, as the raw material.

[0045] (2) Put the raw materials in step (1) into the vacuum electric arc furnace, and put the titanium ingot in the center at the same time, and extract it to 7×10 -4 Vacuum degree below Pa. Then, high-purity argon is introduced as a protective gas to smelt titanium ingots and fully absorb the possible residual oxygen in the furnace. Afterwards, the alloy is smelted. In order to ensure uniform composition, each alloy needs to be turned over after melting and cooling. This is repeated 5 times, and each smelting lasts for about 1 minute. After all is completed, wait ...

Embodiment 2

[0049] (1) Using an electronic balance with an accuracy of 0.1mg, the stoichiometric ratio is 6.5:3.5:0.4, and weigh 3.0337g iron pellets (99.9% purity), 1.77236g cobalt flakes (99.9% purity) and 0.2427g germanium Granules (purity: 99.9%), the error is within 0.5mg, as the raw material.

[0050] (2) Put the raw materials in step (1) into the vacuum electric arc furnace, and put the titanium ingot in the center at the same time, and extract it to 7×10 -4 Vacuum degree below Pa. Then, high-purity argon is introduced as a protective gas to smelt titanium ingots and fully absorb the possible residual oxygen in the furnace. Afterwards, the alloy is smelted. In order to ensure uniform composition, each alloy needs to be turned over after melting and cooling. This is repeated 5 times, and each smelting lasts for about 1 minute. After all is completed, wait until the bulk alloy is completely cooled, fill with air, open the furnace door, and take out the bulk alloy.

[0051] (3) Put...

Embodiment 3

[0054] (1) Using an electronic balance with an accuracy of 0.1mg, the stoichiometric ratio is 6.5:3.5:0.6, and weigh 2.9618g iron pellets (99.9% purity), 1.6828g cobalt flakes (99.9% purity) and 0.3554g germanium Granules (purity: 99.9%), the error is within 0.5mg, as the raw material.

[0055] (2) Put the raw materials in step (1) into the vacuum electric arc furnace, and put the titanium ingot in the center at the same time, and extract it to 7×10 -4 Vacuum degree below Pa. Then, high-purity argon is introduced as a protective gas to smelt titanium ingots and fully absorb the possible residual oxygen in the furnace. Afterwards, the alloy is smelted. In order to ensure uniform composition, each alloy needs to be turned over after melting and cooling. This is repeated 5 times, and each smelting lasts for about 1 minute. After all is completed, wait until the bulk alloy is completely cooled, fill with air, open the furnace door, and take out the bulk alloy.

[0056] (3) Put ...

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Abstract

The invention relates to a high-temperature-resistant flaky iron-cobalt-germanium microwave absorption material and a preparation method and application thereof, and belongs to the technical field of wave absorption materials. The material solves the problems that a FeCo alloy is high in hardness and difficult to crush, and has the advantages of being resistant to high temperature and being high in absorption capacity and small in thickness at low frequency. Iron particles, cobalt flakes and germanium particles are respectively weighed and put into a vacuum arc furnace to be fully smelted in a high-purity argon atmosphere to obtain a block alloy, after being manually crushed, the block alloy is put into a vibration ball mill to be subjected to ball milling, and after filtering and drying, a final powder sample is obtained. Fe6.5Co3.5Gex powder has an obvious flaky structure, the Curie temperature is 850.6 DEG C, good microwave absorption performance is achieved within the frequency range of 2-18 GHz, and when the thickness is 2 mm, the maximum reflection loss reaches -14.16 dB, and the effective bandwidth is 2.7 GHz; and when the thickness is 3 mm, the maximum reflection loss reaches -18.40 dB.

Description

technical field [0001] The invention relates to a high-temperature-resistant wave-absorbing material and its preparation method and application, in particular to a high-temperature-resistant flaky iron-cobalt-germanium wave-absorbing material, which belongs to the technical field of wave-absorbing materials. Background technique [0002] As is generally known at present, while various electronic products bring great convenience to people, they have also become new sources of electromagnetic radiation. A large amount of electromagnetic radiation will not only cause electromagnetic interference, affect the normal operation of other electronic devices around, cause unpredictable consequences, but also seriously affect people's health. Not only that, stealth technology, as an effective means to improve weapon combat effectiveness and wartime survival, has also attracted more and more attention from all countries. Whether it is to protect the environment and human health, or to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/10C22C33/04B22F9/04H05K9/00H01Q17/00
CPCC22C38/10C22C38/002C22C33/04B22F9/04H05K9/0081H01Q17/004B22F2009/043
Inventor 杨燚王岩李威王啸坤
Owner NANJING UNIV
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