Iron-cobalt/silicon-barium composite alloy particle temperature-resistant magnetic wave-absorbing agent and preparation method thereof

A magnetic absorber and composite alloy technology, applied in chemical instruments and methods, other chemical processes, antennas, etc., can solve the problems of growing and easily migrating nanocrystalline grains

Active Publication Date: 2021-09-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of nano-scale grains can effectively improve the magnetic permeability of wave absorbers, the grain boundaries of nanocrystals often have high grain boundary energy and are in a metastable state, which leads to the deterioration of the metastable grain boundaries under elevated temperature conditions. Migration is very easy to cause the growth of nanocrystalline grains

Method used

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  • Iron-cobalt/silicon-barium composite alloy particle temperature-resistant magnetic wave-absorbing agent and preparation method thereof
  • Iron-cobalt/silicon-barium composite alloy particle temperature-resistant magnetic wave-absorbing agent and preparation method thereof
  • Iron-cobalt/silicon-barium composite alloy particle temperature-resistant magnetic wave-absorbing agent and preparation method thereof

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Effect test

Embodiment 1

[0036] An iron-cobalt / silicon-barium composite alloy particle temperature-resistant magnetic wave-absorbing agent is provided, and its preparation method includes the following steps:

[0037]1) 18g FeCo alloy particles (containing 50wt.% Co, particle size is -500 mesh) and 2g SiBa alloy particles (containing 30wt.% Ba and 35wt.% Si elements, the balance is Fe, particle size is -300 order) into a ball mill jar, weigh 10mm and 6mm stainless steel balls according to the powder-to-material ratio of 20:1, and the ratio of the big and small balls is 3:2; then add 20ml of analytically pure cyclohexane as a process control agent, Then vacuumize the ball mill tank; set the ball mill to the forward and reverse alternate mode, the cycle of each rotation is 1h, stop for 15min in the middle, set the ball milling time to 80h, and the speed to 300rpm / min; after the ball milling is completed, use a screen Separation of balls and powder;

[0038] 2) Take 10g of the powder obtained in step 1)...

Embodiment 2

[0044] An iron-cobalt / silicon-barium composite alloy particle temperature-resistant magnetic wave-absorbing agent is provided, and its preparation method includes the following steps:

[0045] 1) 19g FeCo alloy particles (containing 50wt.% Co element, particle size is -500 mesh) and 1g SiBa alloy particles (containing 30wt.% Ba and 35wt.% Si elements, the balance is Fe, particle size is - 300 mesh) into the ball mill jar, weigh 10mm and 6mm stainless steel balls according to the powder-to-material ratio of 20:1, and the ratio of the big and small balls is 3:2; then add 20ml of analytically pure cyclohexane as a process control agent , and then vacuumize the ball mill tank; set the ball mill to the forward and reverse alternate mode, the cycle of each rotation is 1h, stop for 15min in the middle, set the ball milling time to 60h, and the speed to 300rpm / min; after the ball milling is completed, use a sieve Net separation ball and powder;

[0046] 2) Take 10g of the powder obta...

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Abstract

The invention relates to an iron-cobalt / silicon-barium composite alloy particle temperature-resistant magnetic wave-absorbing agent and a preparation method thereof. The temperature-resistant magnetic wave-absorbing agent comprises FeCo nanocrystals, Si and Ba, wherein the Si and the Ba are distributed at crystal lattices and crystal boundaries of the FeCo nanocrystals. The preparation method comprises the following steps: 1) mixing SiBa alloy particles and FeCo alloy particles, carrying out ball milling under an anaerobic condition, and then separating powder; and 2) stirring and grinding the powder obtained in the step 1), separating the powder, and drying to obtain the iron-cobalt / silicon-barium composite alloy particle temperature-resistant magnetic wave-absorbing agent. According to the wave-absorbing agent, after heat treatment at the temperature of 500 DEG C, the grain size increase is small, meanwhile, the imaginary part peak value of the complex permeability at the frequency of 2-18 GHz is greatly increased, and the wave-absorbing agent has sound grain size and complex permeability high-temperature stability and is low in raw material price, simple in preparation method and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of magnetic wave absorbing agents, and in particular relates to an iron-cobalt / silicon-barium composite alloy particle temperature-resistant magnetic wave absorbing agent and a preparation method thereof. Background technique [0002] With the continuous development of electromagnetic wave technology, radar stealth air weapons, which have important strategic significance, have attracted more and more attention from the military circles of various countries in modern warfare. However, when the aircraft flies at high altitude and high speed, the surface temperature will rise sharply due to the friction with the air. Studies have shown that when the US YF-12 bomber flies at Mach 3, the temperature of the nose, flange and skin can reach about 200-300°C, and the temperature of the front end and surface of the engine can reach about 500°C. Therefore, it is very important to develop high-performance microwave-abso...

Claims

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Application Information

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IPC IPC(8): H01Q17/00C09K3/00
CPCH01Q17/004C09K3/00
Inventor 官建国李凌钦陈志宏付子文郭帅伟李维
Owner WUHAN UNIV OF TECH
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