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Titanium-silicon-carbon composite wave-absorbing agent and preparation method and application thereof

A technology of composite wave-absorbing materials and wave-absorbing agents, applied in chemical instruments and methods, other chemical processes, radiation-absorbing coatings, etc., can solve the problems of narrow electromagnetic wave absorption frequency band and poor electromagnetic impedance matching, and achieve low surface density, The effect of absorption frequency bandwidth, density and high temperature oxidation resistance

Active Publication Date: 2018-11-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium silicon carbide (Ti 3 SiC 2 ) materials have certain electrical conductivity, high specific surface area and high temperature oxidation resistance, dielectric loss and ohmic loss will occur when electromagnetic waves pass through, and have great application potential in the field of wave-absorbing materials, but a single Ti 3 SiC 2 The electromagnetic impedance matching of the material is poor, resulting in a narrow absorption frequency band for electromagnetic waves

Method used

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  • Titanium-silicon-carbon composite wave-absorbing agent and preparation method and application thereof
  • Titanium-silicon-carbon composite wave-absorbing agent and preparation method and application thereof
  • Titanium-silicon-carbon composite wave-absorbing agent and preparation method and application thereof

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Effect test

Embodiment 1

[0032] The invention provides a Ti 3 SiC 2 The preparation method of composite wave absorbing agent comprises the following steps:

[0033] (1) Weigh 7.3g Ni(NO 3 ) 2 ·6H 2 O, 7.5g Zn(NO 3 ) 2 ·6H 2 O and 40.4gFe(NO 3 )·9H 2 O, and dissolved in a beaker with 500mL deionized water to prepare a mixed nitrate solution; then add 37.8g complexing agent citric acid, then slowly add a 40% ammonia solution, adjust the pH to 7, and stir evenly form a mixed solution;

[0034] (2) 35.7g Ti 3 SiC 2 The powder is dispersed in the mixed solution, placed in an 80°C water bath and heated and stirred for 5 hours to obtain a stable and uniform composite precursor sol;

[0035] (3) Place the prepared composite precursor sol in a drying oven at 120°C to dry, and the gel formed after the water evaporates is coated on the Ti 3 SiC 2 After the powder is surfaced, it is pre-fired at 400°C for 3h, then ground, and placed in a box-type resistance furnace for sintering at 600°C for 2h to o...

Embodiment 2

[0038] The invention provides a Ti 3 SiC 2 The preparation method of composite wave absorbing agent comprises the following steps:

[0039] (1) Weigh 10.9g Ni(NO 3 ) 2 ·6H 2 O, 11.2g Zn(NO 3 ) 2 ·6H 2 O and 60.6gFe(NO 3 )·9H 2 O, and be dissolved in the beaker that 500mL deionized water is housed and make mixed nitrate solution; Then add 98.5g complexing agent ethylenediaminetetraacetic acid, then slowly add concentration and be 30% ammonia solution, adjust pH to 8 , uniformly stirred to form a mixed solution;

[0040] (2) 71.4g Ti 3 SiC 2 The powder is dispersed in the mixed solution, placed in a 90°C water bath and heated and stirred for 4 hours to obtain a stable and uniform composite precursor sol;

[0041] (3) Place the prepared composite precursor sol in a drying oven at 130°C to dry, and the gel formed after the water evaporates is coated on the Ti 3 SiC 2 After the powder is surfaced, it is pre-fired at 300°C for 4h, then ground, and placed in a box-type ...

Embodiment 3

[0043] The invention provides a Ti 3 SiC 2 The preparation method of composite wave absorbing agent comprises the following steps:

[0044] (1) Weigh 7.3g Ni(NO 3 ) 2 ·6H 2 O, 7.5g Zn(NO 3 ) 2 ·6H 2 O and 40.4gFe(NO 3 )·9H 2 O, and dissolved in a beaker with 500mL of deionized water to prepare a mixed nitrate solution; then add 15.9g of citric acid and 43.8g of ethylenediaminetetraacetic acid mixed complexing agent, and then slowly add a concentration of 40% ammonia Aqueous solution, adjust the pH to 7, and stir evenly to form a mixed solution;

[0045] (2) 59.5g Ti 3 SiC 2 The powder is dispersed in the mixed solution, heated and stirred in an 80°C water bath for 4 hours to obtain a stable and uniform composite precursor sol;

[0046] (3) Place the prepared composite precursor sol in a drying oven at 130°C to dry, and the gel formed after the water evaporates is coated on the Ti 3 SiC 2 After the powder is surfaced, it is pre-fired at 400°C for 3h, then ground, ...

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Abstract

The invention discloses a titanium-silicon-carbon composite wave-absorbing agent, which is composed of Ti3SiC2-based shell and Ni0.5Zn0.5Fe2O4 ferrite magnetic nano coating, wherein the mass ratio ofNi0.5Zn0.5Fe2O4 ferrite to Ti3SiC2 is 1:(3-6). The electromagnetic characteristic of Ti3SiC2 is adjusted by a Ti3SiC2 composite wave-absorbing agent and Ni0.5Zn0.5Fe2O4 ferrite coating layer, the impedance match performance of the composite wave-absorbing agent is improved, when the electromagnetic wave effect is used on the Ni0.5Zn0.5Fe2O4 ferrite coating layer, dielectric loss and magnetic lossare generated, and the wave-absorbing performance of the composite absorbent can be enhanced. The preparation method has the advantages of easy control of process condition, simple operation, and lowpreparation cost; the wave-absorbing material has the characteristics of wide band, low density, and strong wave absorbing, the surface density of the composite absorbing material is in 1.5 kg / m<2., the absorption band is wide, and the reflectivity test result shows that the band is better than -10 dB(90% of absorption) bandwidth by 9.0 GHz.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and in particular relates to a titanium-silicon-carbon composite wave absorber and its preparation method and application. Background technique [0002] The extensive use of high-frequency electromagnetic equipment has brought about increasingly serious electromagnetic pollution problems; at the same time, the rapid development of radar detection technology has posed a serious threat to military targets. The wave-absorbing material can convert the incident electromagnetic wave energy into heat energy or other forms of energy by filling the powder wave-absorbing agent to attenuate the electromagnetic wave loss, so as to improve the surrounding electromagnetic environment and effectively reduce the radar detection characteristic signal of military targets, which is very important. technical and economic practical value. In recent years, the absorber materials studied at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00H05K9/00C09D163/00C09D5/32
CPCC09D5/32C09D163/00C09K3/00H05K9/0081C08K9/10C08K3/34
Inventor 邓联文贺君罗衡黄生祥廖聪维
Owner CENT SOUTH UNIV
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