Electromagnetic wave absorbing silicon-carbide material coated with barium ferrite film and its preparation process

A barium ferrite, electromagnetic wave absorbing technology, applied in electrical components, other chemical processes, instrument parts, etc., can solve the problems of narrow frequency band, large specific gravity and poor practical effect of ferrite coatings

Inactive Publication Date: 2005-08-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When ferrite is used as a wave absorbing agent, there is mainly the problem of large specificity

Method used

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  • Electromagnetic wave absorbing silicon-carbide material coated with barium ferrite film and its preparation process
  • Electromagnetic wave absorbing silicon-carbide material coated with barium ferrite film and its preparation process
  • Electromagnetic wave absorbing silicon-carbide material coated with barium ferrite film and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] The precursor is prepared by complexing ferric nitrate and barium nitrate with citric acid. According to the stoichiometric ratio Ba(NO 3 ) 2 : Fe(NO 3 ) 3 : Citric acid = 1:12:19 to prepare a solution. Add silicon carbide to the solution. The theoretical product mass ratio of silicon carbide and ferrite is 1:1. Add ammonia water to adjust the PH value to 7. The solution is placed in a water bath at 90°C and stirred for 4 to 5 hours until the liquid is a viscous colloid. The prepared sol was placed in an oven at 120°C for 4 hours to obtain a dry gel. The resulting gel is heated in a muffle furnace. Heating rate: 60℃ / h, when the temperature is raised to 850℃, keep for 1h.

Example Embodiment

[0026] Example 2

[0027] The precursor is prepared by complexing ferric nitrate and barium nitrate with citric acid. According to the stoichiometric ratio Ba(NO 3 ) 2 : Fe(NO 3 ) 3 : Citric acid = 1:12:13 to prepare a solution. Add silicon carbide to the solution. The theoretical product mass ratio of silicon carbide and ferrite is 2:1. Add ammonia water to adjust the PH value to 7. The solution is placed in a water bath at 90°C and stirred for 4 to 5 hours until the liquid is a viscous colloid. The prepared sol was placed in an oven at 120°C for 5 hours to obtain a dry gel. The resulting gel is heated in a muffle furnace. Heating rate: 30℃ / h, when the temperature is raised to 750℃, keep for 3h.

Example Embodiment

[0028] Example 3

[0029] The precursor is prepared by complexing ferric nitrate and barium nitrate with citric acid. According to the stoichiometric ratio Ba(NO 3 ) 2 : Fe(NO 3 ) 3 : Citric acid = 1:12:15 to prepare a solution. Add silicon carbide to the solution. The theoretical product mass ratio of silicon carbide and ferrite is 1:1.5. Add ammonia water to adjust the PH value to 7. The solution is placed in a water bath at 90°C and stirred for 4 to 5 hours until the liquid is a viscous colloid. The prepared sol was placed in an oven at 120°C for 5 hours to obtain a dry gel. The resulting gel is heated in a muffle furnace. Heating rate: 100℃ / h, when the temperature is raised to 800℃, keep for 2h.

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Abstract

An electromagnetic wave absorbing silicon-carbide particle coated by baruim ferrite film is prepared by citrate sol-gel method, that is, proportionally coating the barium ferrite film on the surface of silicon carbide particle. It can be used for wave absorbing coating.

Description

technical field [0001] The invention relates to a composite wave-absorbing material and a preparation process thereof, in particular to a silicon carbide electromagnetic wave-absorbing material coated with a barium ferrite film and a preparation process thereof. Background technique [0002] Electromagnetic radiation has a great impact on the living environment and working environment. Environmental electromagnetic pollution has attracted people's attention. Many countries have formulated corresponding electromagnetic radiation safety standards. With the improvement of the living standard of the whole society and the enhancement of people's awareness of environmental protection and health care, the requirements for electromagnetic wave pollution control will become one of the important indicators of environmental protection. Within the range covered by electromagnetic radiation (public buildings, public places, residential areas, etc.), measures are taken from the building i...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09K3/00G12B17/02H05K9/00
Inventor 张晏清张雄
Owner TONGJI UNIV
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