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Composite wave absorbing material and production thereof

A composite wave-absorbing material and preparation technology, applied in radiation-absorbing coatings, etc., can solve problems such as poor temperature stability and high density

Inactive Publication Date: 2005-07-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages are higher density and poor temperature stability

Method used

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  • Composite wave absorbing material and production thereof
  • Composite wave absorbing material and production thereof
  • Composite wave absorbing material and production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The precursor was prepared by complexing ferric nitrate and barium nitrate with citric acid. Stoichiometric ratio: Ba(NO 3 ) 2 : Fe(NO 3 ) 3 : citric acid = 1:12:19. A solution is prepared and the porous glass phase is added to the solution. The theoretical product mass ratio of porous glass phase to ferrite is 1:1. Ammonia water was added dropwise to adjust the pH value to 7. The solution was placed in a 90°C water bath and stirred for 4 to 5 hours until the liquid became a viscous colloid. The prepared sol was placed in an oven at 120° C. for 4 h to obtain a dry gel. The obtained gel was heated in a muffle furnace at a heating rate of 60 °C / h, and when the temperature was raised to 850 °C, it was kept for 1 h.

Embodiment 2

[0025] The precursor was prepared by complexing ferric nitrate and barium nitrate with citric acid. Stoichiometric ratio: Ba(NO 3 ) 2 : Fe(NO 3 ) 3 : citric acid = 1:12:13. A solution is prepared and the porous glass phase is added to the solution. The theoretical product mass ratio of porous glass phase to ferrite is 3:1. Ammonia water was added dropwise to adjust the pH value to 7. The solution was placed in a 90°C water bath and stirred for 4 to 5 hours until the liquid became a viscous colloid. The prepared sol was placed in an oven at 120° C. for 4 h to obtain a dry gel. The obtained gel was heated in a muffle furnace at a heating rate of 80 °C / h, and when the temperature was raised to 950 °C, it was kept for 1 h.

Embodiment 3

[0027] The precursor was prepared by complexing ferric nitrate and barium nitrate with citric acid. Stoichiometric ratio: Ba(NO 3 ) 2 : Fe(NO 3 ) 3 : citric acid == 1:12:15. A solution is prepared and the porous glass phase is added to the solution. The theoretical product mass ratio of porous glass phase to ferrite is 5:1. Ammonia water was added dropwise to adjust the pH value to 7. The solution was placed in a 90°C water bath and stirred for 4 to 5 hours until the liquid became a viscous colloid. The prepared sol was placed in an oven at 120° C. for 4 h to obtain a dry gel. The obtained gel was heated in a muffle furnace at a heating rate of 30°C / h, and when the temperature was raised to 650°C, it was kept for 5 hours.

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PUM

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Abstract

A composite wave-absorbing material and its production are disclosed. The multi-hole glass phase micro-particle surface is coated by barium ferrite thin film, the mass ratio of multi-hole glass phase and ferrite is 0.1-10:1. The barium ferrite layer is produced on multi-hole glass phase micro-particle surface by citrate sol-gel method. The absorbing frequency range of composite material is wider than the barium ferrite. It can be used for electromagnetic wave absorbing material of aircraft and building coating.

Description

technical field [0001] The invention relates to a wave-absorbing material and a preparation process thereof, in particular to a composite wave-absorbing material and a preparation process thereof. Background technique [0002] With the development of modern science and technology, environmental pollution caused by electromagnetic radiation has become a new social hazard. Electromagnetic radiation has a great impact on the living environment and working environment. Electromagnetic environmental pollution has caused many adverse effects. 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 itself (to absorb electromagnetic waves), that is, new environmentally friendly wave-absorbing materials are used to attenuate electromagnetic waves generated by ...

Claims

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Application Information

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IPC IPC(8): C03C17/23C09D5/32
Inventor 张雄张晏清
Owner TONGJI UNIV
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