Ferrite wave-absorbing material and preparation method thereof
A wave absorbing material, ferrite technology, applied in antennas, electrical components, magnetic field/electric field shielding and other directions, can solve the problems of small production scale, high cost, low efficiency, etc., and achieve low production cost, high production efficiency and energy efficiency. low consumption effect
Pending Publication Date: 2022-01-21
WUHAN UNIV OF TECH
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Problems solved by technology
These preparation methods have small production scale, high efficiency and low cost
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Embodiment 1
[0030] A kind of ferrite absorbing material, described component is Sr 4 Fe 6 o 13 .
[0031] The preparation method of the above-mentioned ferrite absorbing material comprises the following steps:
[0032] (1) According to the chemical expression of Sr 4 Fe 6 o 13 Stoichiometric ratio selection of carbonates of Sr and Fe 2 o 3 as a raw material;
[0033] (2) Ball mill the raw materials weighed in step (1) for 12 hours and mix them evenly. Dry the premixed material in an oven at a temperature of 80-100°C. After drying, grind it with a mortar for 2 hours, and then put Put it into a muffle furnace and raise the temperature to 1100°C; wherein, the heating program is divided into a low-temperature sintering stage of 0°C to 1000°C and a high-temperature sintering stage of 1000-1100°C; the heating rate of the low-temperature sintering stage is 2-3°C / min, The heating rate in the high-temperature sintering stage is 1-2°C / min, and the holding time is 2 hours after rising to 11...
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Abstract
The invention relates to a ferrite wave-absorbing material and a preparation method thereof. The chemical formula of the ferrite wave-absorbing material is SrxFeyO; the preparation method comprises the following steps of: (1) selecting SrCO3 and Fe2O3 as raw materials, performing calculating according to the stoichiometric ratio of Sr to Fe in the chemical formula SrxFeyO, and weighing the raw materials; (2) adding the raw materials into a ball milling tank, adding absolute ethyl alcohol and zirconium balls, carrying out ball milling and drying, then grinding the raw materials by using a mortar, putting the ground raw materials into a crucible, putting the crucible into a muffle furnace, performing sintering in an air atmosphere, and naturally cooling then product after sintering is completed; and (3) carrying out ball milling on the sintered powder, and performing grinding and refining to obtain the wave-absorbing ferrite powder. The wave-absorbing ferrite with excellent microwave absorbing capacity and wide effective frequency band width can be obtained by utilizing the formula and the preparation method, has the advantages of high stability, excellent performance, simple process and low production cost, and has relatively high practical value and wide application prospect in the fields of electromagnetic shielding and stealth.
Description
technical field [0001] The invention relates to the technical field of radar absorbing materials, in particular to a ferrite absorbing material and a preparation method thereof. Background technique [0002] With the development and progress of society, the rapid development of electronic information and microwave communication technology, electronic devices continue to emerge in our daily life, electromagnetic waves are widely used in aerospace, military, medical and health fields, and communications. The electromagnetic interference (EMI) phenomenon brought by it has gradually become one of the serious problems. This affects the stability of information communication, such as aerospace and other important fields, and even safety accidents may occur. Studies have shown that long-term exposure to a large amount of electromagnetic radiation will also cause damage to the human immune system, reproductive system and nervous system. Therefore, electromagnetic interference will...
Claims
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IPC IPC(8): C04B35/26C04B35/622H01Q17/00H05K9/00
CPCC04B35/2683C04B35/622H01Q17/00H05K9/0081C04B2235/3213C04B2235/6562C04B2235/6567C04B2235/96
Inventor 郝华罗洪亮
Owner WUHAN UNIV OF TECH