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Preparation method of flaky calcium hexaaluminate ceramic composite wave-absorbing material loaded with magnetic metal element

A composite technology of flaky calcium hexaaluminate and ceramics, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of difficult large-scale production and application, high requirements for production equipment, complicated process, etc., and achieve low cost, The effect of low requirements on production equipment and simple process

Active Publication Date: 2019-04-05
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Among the existing methods for preparing composite microwave absorbing materials, most of them have high requirements for production equipment, complicated process, and common problems of low yield and high cost, which are only suitable for laboratory research and difficult to realize large-scale production and application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Take coal gangue and limestone as raw materials, and carry out crushing, grinding, screening and drying treatment on them respectively. Sieve with a 1000-mesh standard sieve, and dry in an oven at 110°C for 5 hours;

[0026] 2. Mix gangue powder and lime powder at a mass ratio of 20:1, wet grind, then dry and sieve to make mixed raw material powder;

[0027] 3. It is 1750 ± 50 polyvinyl alcohol with a degree of polymerization to prepare a polyvinyl alcohol aqueous solution with a concentration of 4 wt% as a binder solution;

[0028] 4. Weigh 0.19kg of binder solution and 1.5kg of mixed raw material powder, place them in an Eilixu powerful mixer to process them into ceramic raw meal balls, and then dry the ceramic raw meal balls in an oven at 40°C. After 20 / 70 mesh standard sieve, put it into a 1200℃ constant temperature furnace for sintering for 3 hours, and the particle size is 0.2~0.8mm, and the apparent density is 2.1~2.7cm 3 / g ceramic matrix;

[0029] 5. Wei...

Embodiment 2

[0034] 1. Take coal gangue and limestone as raw materials, and carry out crushing, grinding, screening and drying treatment on them respectively. Sieve with a 1000-mesh standard sieve, and dry in an oven at 110°C for 5 hours;

[0035] 2. Mix gangue powder and lime powder at a mass ratio of 22:1, wet grind, then dry and sieve to make mixed raw material powder;

[0036] 3. It is 1750 ± 50 polyvinyl alcohol with a degree of polymerization to prepare a polyvinyl alcohol aqueous solution with a concentration of 3 wt% as a binder solution;

[0037] 4. Weigh 0.2kg of binder solution and 1.6kg of mixed raw material powder, place them in an Eilixu powerful mixer and process them into ceramic raw meal balls, then dry the ceramic raw meal balls in an oven at 40°C, and after 20 / 70 mesh standard sieve, put it into a 1200℃ constant temperature furnace for sintering for 3 hours, and the particle size is 0.2~0.8mm, and the apparent density is 2.1~2.7cm 3 / g ceramic matrix;

[0038] 5. Wei...

Embodiment 3

[0043] 1. Take coal gangue and limestone as raw materials, and carry out crushing, grinding, screening and drying treatment on them respectively. Sieve with a 1000-mesh standard sieve, and dry in an oven at 110°C for 5 hours;

[0044] 2. Mix gangue powder and lime powder at a mass ratio of 25:1, wet grind, then dry and sieve to make mixed raw material powder;

[0045] 3. It is 1750 ± 50 polyvinyl alcohol with a degree of polymerization to prepare a polyvinyl alcohol aqueous solution with a concentration of 4 wt% as a binder solution;

[0046] 4. Weigh 0.22kg of binder solution and 1.5kg of mixed raw material powder, place them in an Eilixu powerful mixer and process them into ceramic raw meal balls, then dry the ceramic raw meal balls in an oven at 40°C, and after 20 / 70 mesh standard sieve, put it into a 1200℃ constant temperature furnace for sintering for 3 hours, and the particle size is 0.2~0.8mm, and the apparent density is 2.1~2.7cm 3 / g ceramic matrix;

[0047] 5. Di...

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PUM

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Abstract

The invention discloses a method for preparing a magnetic metal loaded monomeric flaky calcium hexaluminate ceramic composite wave absorption material, and belongs to the technical field of microwave absorption materials. The method is characterized by comprising the following steps: firstly, processing limestone and coal gangue into raw material powder, synthesizing flaky calcium hexaluminate ceramic raw material balls by using an Eirich forceful mixing machine, screening the raw material balls, performing high-temperature sintering so as to obtain a ceramic substrate of a certain diameter range, performing acidification hydrophilic treatment on the ceramic substrate, putting into a pecursor solution in which metal ions Fe<3+>, Co<2+> or Ni<2+> are dissolved, introducing the precursor solution into the ceramic substrate according to a liquid-phase synthesis method, and finally performing thermal reduction, so as to obtain the flaky calcium hexaluminate ceramic composite wave absorption material loaded with a magnetic metal monomer Fe, Co or Ni. The method has the advantages that the component SiO2 in the coal gangue is a good wave permeation medium and is uniformly dispersed inside the composite material, and thus absorption of electromagnetic waves can be improved. The ceramic composite wave absorption material prepared according to the method has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of composite microwave absorbing materials, and in particular relates to a method for preparing sheet-like calcium hexaaluminate ceramic composite wave-absorbing materials loaded with magnetic metal element. Background technique [0002] Coal gangue is industrial solid waste discharged during coal mining and coal washing. It is a low calorific value fuel that contains a certain amount of combustibles and a large number of usable minerals associated with coal seams during the coal formation process. The long-term and continuous accumulation and discharge of coal gangue not only occupies a large amount of land, but also pollutes the environment, water resources, and land resources, and the resulting solid dust pollution has caused serious harm to the ecological environment. With the development of circular economy, solid waste is called "misplaced resources". Therefore, the treatment and resource utilization ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00C04B35/44C04B35/622C04B35/626C04B35/628
CPCC04B35/44C04B35/622C04B35/62204C04B35/62695C04B35/62842C04B2235/3208C04B2235/96
Inventor 力国民田玉明柴跃生冯琨王凯悦周毅武雅乔邹欣伟梁丽萍郝建英马海强朱保顺
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY