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Lithium-zinc-ferrite microwave electromagnetic consumable material and preparation method thereof

A technology of electromagnetic loss and ferrite, which is applied in the field of lithium-zinc ferrite materials and their preparation, can solve the problems of high price and limited application of ferrite materials, and achieve short reaction time, low manufacturing cost and excellent electromagnetic loss Effect

Active Publication Date: 2013-02-06
NANJING JINNING MICROWAVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-purity lithium oxide raw material required in the existing traditional solid phase ball milling method is difficult to purchase due to its application in new fuel cells, and the high price greatly limits the application of this ferrite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] According to the stoichiometric ratio lithium of material system: zinc: magnesium: iron: the ratio of oxygen=0.15: 0.7: 0.01: 2.14: 4 weighs respectively 0.31 grams of analytically pure lithium nitrate, 6.247 grams of zinc nitrate, 0.077 grams of magnesium nitrate, Ferric nitrate 25.937 grams, take by weighing analytically pure citric acid 18.913 grams in the ratio of 1: 1 simultaneously by the mol ratio of citric acid and metal cation total amount. Dissolve all the weighed raw materials together in deionized water, stir to form a uniform solution, add ammonia water dropwise to the mixed solution, and adjust its pH to 6.5. Finally, weigh 20 grams of absorbent cotton to absorb all the above mixed solution, put the absorbent cotton that has absorbed the solution in an oven at 300°C and let it spontaneously ignite to obtain a precursor, then calcinate the precursor at a rate of 240°C / hour to 800°C, and keep it warm for 3 hours Then slowly cool down to room temperature with...

Embodiment 2

[0015] According to the stoichiometric ratio lithium of material system: zinc: magnesium: iron: the ratio of oxygen=0.15: 0.7: 0.05: 2.1: 4 weighs respectively analytically pure lithium acetate 0.297 grams, zinc nitrate 6.247 grams, magnesium nitrate 0.385 grams, Ferric nitrate 25.452 grams, take by weighing analytically pure ethylenediaminetetraacetic acid 39.42 grams simultaneously in the ratio of 1.5: 1 by the mol ratio of citric acid and metal cation total amount. Dissolve all the weighed raw materials together in deionized water, stir to form a uniform solution, add ammonia water to the mixed solution, and adjust its pH to 6. Finally, weigh 35 grams of absorbent cotton to absorb all the above mixed solution, put the absorbent cotton that has absorbed the solution in an oven at 250°C and let it spontaneously ignite to obtain a precursor, then calcinate the precursor at a rate of 210°C / hour to 850°C, and keep it warm for 2.5 hours Then slowly cool down to room temperature w...

Embodiment 3

[0018] According to the stoichiometric ratio lithium of material system: zinc: magnesium: iron: the ratio of oxygen=0.15: 0.7: 0.1: 2.05: 4 weighs respectively analysis pure lithium acetate 0.297 gram, zinc nitrate 6.247 gram, magnesium nitrate 0.77 gram, Ferric nitrate 24.846, take by weighing analytically pure citric acid 37.825 grams simultaneously in the ratio of 2: 1 by the mol ratio of citric acid and metal cation total amount. Dissolve all the raw materials weighed together in deionized water, stir to form a uniform solution, add ammonia water to the mixed solution, and adjust its pH to 7. Finally, weigh 50 grams of absorbent cotton to absorb all the above mixed solution, put the absorbent cotton that has absorbed the solution in an oven at 180°C and let it spontaneously ignite to obtain a precursor, then calcinate the precursor at a rate of 180°C / hour to 900°C, and keep it warm for 2 hours Then slowly cool down to room temperature with the furnace, then take out the sa...

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Abstract

The invention discloses a lithium-zinc-ferrite microwave electromagnetic consumable material, which has a chemical formula Li0.15Zn0.7Mg0.01-0.1Fe2.14-2.05O4. The microwave electromagnetic consumable material is synthesized by a solid macromolecular absorption spontaneous combustion method that comprises: mixing a metal nitrate serving as the raw material according to the stoichiometric ratio of the ferrite; adding a certain amount of oxidizer; dissolving the mixture in water to form uniform solution; completely absorbing the solution by cellulosic cotton; allowing the cellulosic cotton to combust spontaneously to obtain a precursor; placing the precursor in an oven for heating to obtain corresponding magnesium-doped lithium-zinc-ferrite powder. The method has the advantages of simplifying process, greatly reducing preparation time, achieving high crystallinity with instant combustion, avoiding lithium loss and producing powder with high purity and uniform particle size distribution. The powder is suitable to be used as a microwave electromagnetic consumable material, so the raw material is low in price and readily available.

Description

technical field [0001] The invention relates to a magnesium-doped lithium-zinc ferrite material and a preparation method thereof, belonging to the technical field of microwave electromagnetic loss materials. Background technique [0002] Spinel-type ferrite represented by Li-Zn ferrite has both ferrimagnetism and dielectric properties. When electromagnetic waves pass through, it can generate both magnetic loss and dielectric loss, and has been widely used in absorbing electromagnetic waves, reducing the interference of electromagnetic waves on test signals, and protecting the human body from electromagnetic radiation. The high-purity lithium oxide raw material required in the existing traditional solid phase ball milling method is difficult to purchase due to its application in new fuel cells, and it is expensive, which greatly limits the application of this ferrite material. The solid-state polymer adsorption method uses cellulose-organic acid-metal salt thermal decomposit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 张其土宋杰王丽熙
Owner NANJING JINNING MICROWAVE
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