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A kind of preparation method of basswood template porous ferrite ceramics

A technology of porous iron and ferrite, which is used in the preparation of inorganic porous ceramics and biomass materials, can solve the problems of limiting the application range and high density of wave absorbing materials, and achieve the effect of excellent electromagnetic wave absorbing performance and low density.

Active Publication Date: 2021-07-16
ANHUI AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its high density limits its application range as a wave-absorbing material.

Method used

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  • A kind of preparation method of basswood template porous ferrite ceramics
  • A kind of preparation method of basswood template porous ferrite ceramics
  • A kind of preparation method of basswood template porous ferrite ceramics

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of the eucalyptus template:

[0029] 5 years old eucalyptus is taken from the forest farm in Anhui Agricultural University. After dryness, the saw is cut into 6mm (AXIAL) × 20mm (RADIAL) × 20mm (tangential), the cut wood is placed in an ultrasonic cleaner, adding 60 ° C deionized water ultrasound oscillation 2H; take out after 70 ° C After drying in the oven, transferred into the Sodho extractor, extracted in a 100 mL of a phenol solution, an adder ratio of 95% CH 3 CH 2 OH: C 6 Hide 6 = 2: 1 Kelly 20h, take out the wooden blocks, placed in the ventilation cabinet.

[0030] (2) ni 0.5 Zn 0.5 FE 2 O 4 Ferrite sol preparation:

[0031] Preparation Ni 0.5 Zn 0.5 FE 2 O 4 Sol 0.1 mol, the name and quality of the purified chemical reagent using the national medicine group production are as follows: Ni (NO 3 ) 2 · 6h 2 O: 14.539 grams, Zn (no 3 ) 2 · 6h 2 O: 14.874 grams, Fe (NO 3 ) 3 · 9h 2 O: 80.800 grams, weigh three chemical reagents, remove 1000 ml of ion wate...

Embodiment 2

[0037] Immersion scheme optimization:

[0038] Define the impregnation rate I: Among them, M 0 For the original quality of the block, M n Tryless quality after impregnation. Ni for the concentration of 0.20 mol / L, 0.40 mol / L, 0.60mol / L, 0.80mol / L, respectively. 0.5 Zn 0.5 FE 2 O 4 The ferrite sol were each piece of eucalyptus 1, and the test measured corresponding impregnation ratios were: 78%, 81%, 112% and 98%, respectively. It can be seen that the solub dip impregnation effect of 0.60 mol / L is the best. At the same time, the relationship between the impregnation rate and the impregnation time (the sol concentration is 0.60mol / L) figure 1 . The prolongation of the impregnation time is conducive to the liquid with the wood, so that the penetration and diffusion have enough time to achieve the final balance; however, considering the time cost, the impregnation time cannot be too long, so this experiment is set to 50h. Finally, the impregnation ratio corresponding to 1...

Embodiment 3

[0040] High temperature sintering scheme optimization:

[0041] figure 2 (b) and (d) The picture is the powder TG-DSC curve after the impregnation of the eucalyptus, from the (B) showing about 60% weight loss at a region of 220 ° C-240 ° C, the weight loss rate is the largest, from (d) It can be seen that the DSC curve appears in a deep V-type release peak near 230 ° C, which is mainly due to the concentrated thermal decomposition of the gel to produce a large amount of heat, indicating that the citric acid complex occurs at this temperature range. Frequent combustion; at a temperature region of 430 ° C -480 ° C, the TG curve showed a weight about 5%, which should be residual organic to decompose.

[0042] According to the TG-DSC curve analysis of the above sol, the optimal sintering curve is designed such as image 3 Indicated.

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Abstract

The invention discloses a method for preparing porous ferrite ceramics with a basswood template. A sol-gel repeated impregnation technique of normal pressure / vacuum / normal pressure / vacuum is used to prepare a basswood template with an obvious impregnation effect; Air atmosphere sintering technology, obtained Ni with the microstructure of the basswood template 0.5 Zn 0.5 Fe 2 o 4 Ferrite porous ceramics. The technical method of the present invention provides a more advanced technical reference for the impregnation of wood templates to prepare porous ceramic materials; the prepared Ni 0.5 Zn 0.5 Fe 2 o 4 Porous ceramics have low density and excellent electromagnetic wave absorption performance, and are expected to be used in high-demand military and civilian electromagnetic shielding fields.

Description

Technical field [0001] The present invention relates to a biomass material, and inorganic porous ceramic preparation techniques, in particular to a preparation method of porous ferrite ceramics of eucalyptus template. Background technique [0002] As the sleeper material in the broad-leaved material, the internal tube holes are rich, the size of the hole in the morning and evening tube is not significantly different, and evenly distributed in the annual wheel, it is easy to flow in it; and the hydrazine hardness is moderate, and the cell interstitial The structure is uniform, easy to process, strong toughness, is not easy to crack. Therefore, a fine template for preparing porous ceramic materials is prepared. [0003] Ni 0.5 Zn 0.5 FE 2 O 4 Ferrite is a high-performance ferrous magnetic material. Its crystal structure is the same as natural magnesium aluminum spinel structure, wherein the oxygen ion is cubic, and there is a tetrahedral seat (A bit) and an octahedron. Two types of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/06C04B35/624C04B35/26
CPCC04B35/265C04B35/624C04B38/0615C04B38/068C04B2235/3279C04B2235/3284
Inventor 李锐杨玉英钱良存刘盛全
Owner ANHUI AGRICULTURAL UNIVERSITY
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