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Preparation method of ScFeO3 wave-absorbing ceramic with 3D network microstructure

A microstructure and network technology, applied in the field of preparation of ScFeO3 wave-absorbing ceramics, to achieve the effects of easy implementation, good phase stability and water vapor corrosion resistance, and improved impedance matching characteristics

Active Publication Date: 2022-07-12
CHENGDU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention aims at the problem that the traditional ceramic matrix has a relatively high real part of the dielectric constant, a large amount of electromagnetic waves will be reflected on the surface of the material, and the electromagnetic waves cannot be absorbed into the material as much as possible, and a ScFeO with a 3D network microstructure is provided. 3 The preparation method of microwave-absorbing ceramics, that is, the realization of ScFeO by sol-gel method and pressureless calcination method 3 Microstructure evolution inside ceramics, controllable synthesis of ScFeO with 3D network microstructure 3 Ceramic; microwave incident on ScFeO 3 When the ceramic surface, incidence, reflection and transmission occur, ScFeO 3 Nanowires formed in absorbing ceramics, ScFeO 3 Particles and nanowires construct a 3D network microstructure, which provides rich microwave interfaces and provides multi-level channels for the rapid transmission of microwave energy

Method used

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  • Preparation method of ScFeO3 wave-absorbing ceramic with 3D network microstructure
  • Preparation method of ScFeO3 wave-absorbing ceramic with 3D network microstructure
  • Preparation method of ScFeO3 wave-absorbing ceramic with 3D network microstructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: A ScFeO with 3D Network Microstructure 3 The preparation method of wave absorbing ceramics, the specific steps are as follows:

[0022] (1) The Sc (NO 3 ) 3 ·6H 2 O and Fe (NO 3 ) 3 ·9H 2 O was dissolved in deionized water to obtain Sc(NO 3 ) 3 Solution and Fe(NO 3 ) 3 solution; in which Sc(NO 3 ) 3 ·6H 2 Sc and Fe(NO) in O 3 ) 3 ·9H 2 The molar ratio of Fe in O is 1:1, Sc(NO 3 ) 3 The solution concentration is 2mol / L, Fe(NO 3 ) 3 The solution concentration is 2mol / L;

[0023] (2) adding polyvinyl alcohol to Sc(NO 3 ) 3 In the solution, stir to obtain solution A; wherein the addition of polyvinyl alcohol is 2g / L;

[0024] (3) The solution A and Fe (NO 3 ) 3 The solution was mixed uniformly and stirred for 12 hours to form a sol, then dehydrated at 200 °C for 6 hours, and then calcined at 800 °C for 5 hours to obtain ScFeO 3 powder;

[0025] (4) The ScFeO 3 The powder was cold-pressed and calcined at 1200 °C for 5 h to obtain ScFeO w...

Embodiment 2

[0030] Example 2: A ScFeO with 3D Network Microstructure 3 The preparation method of wave absorbing ceramics, the specific steps are as follows:

[0031] (1) The Sc (NO 3 ) 3 ·6H 2 O and Fe (NO 3 ) 3 ·9H 2 O was dissolved in deionized water to obtain Sc(NO 3 ) 3 Solution and Fe(NO 3 ) 3 solution; in which Sc(NO3 ) 3 ·6H 2 Sc and Fe(NO) in O 3 ) 3 ·9H 2 The molar ratio of Fe in O is 1:1; Sc(NO 3 ) 3 The solution concentration is 2.8mol / L, Fe(NO 3 ) 3 The solution concentration is 2.8mol / L;

[0032] (2) adding polyvinyl alcohol to Sc(NO 3 ) 3 In the solution, stir to obtain solution A; wherein the addition of polyvinyl alcohol is 2.5g / L;

[0033] (3) The solution A and Fe (NO 3 ) 3 The solution was mixed uniformly and stirred for 13 hours to form a sol, then dehydrated at 300 °C for 7 hours, and then calcined at 900 °C for 6 hours to obtain ScFeO 3 powder;

[0034] (4) The ScFeO 3 The powder was cold-pressed and calcined at 1300 °C for 4 h to obtain ScF...

Embodiment 3

[0036] Example 3: A ScFeO with 3D Network Microstructure 3 The preparation method of wave absorbing ceramics, the specific steps are as follows:

[0037] (1) The Sc (NO 3 ) 3 ·6H 2 O and Fe (NO 3 ) 3 ·9H 2 O was dissolved in deionized water to obtain Sc(NO 3 ) 3 Solution and Fe(NO 3 ) 3 solution; in which Sc(NO 3 ) 3 ·6H 2 Sc and Fe(NO) in O 3 ) 3 ·9H 2 The molar ratio of Fe in O is 1:1, Sc(NO 3 ) 3 The solution concentration is 2.2mol / L, Fe(NO 3 ) 3 The solution concentration is 2.2mol / L;

[0038] (2) adding polyvinyl alcohol to Sc(NO 3 ) 3 In the solution, stir to obtain solution A; wherein the addition of polyvinyl alcohol is 3g / L;

[0039] (3) The solution A and Fe (NO 3 ) 3 The solution was mixed evenly and stirred for 14 hours to form a sol, then dehydrated at 400 °C for 8 hours, and then calcined at 1000 °C for 7 hours to obtain ScFeO 3 powder;

[0040] (4) The ScFeO 3 The powder was cold-pressed and calcined at 1500 °C for 2 h to obtain ScFeO...

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Abstract

The invention relates to the technical field of microwave absorbing materials, in particular to a preparation method of ScFeO3 wave-absorbing ceramic with a 3D network microstructure. The preparation method comprises the following steps: respectively dissolving Sc (NO3) 3.6 H2O and Fe (NO3) 3.9 H2O into deionized water to obtain an Sc (NO3) 3 solution and a Fe (NO3) 3 solution; the preparation method comprises the following steps: adding polyvinyl alcohol into an Sc (NO3) 3 solution, and uniformly stirring to obtain a solution A; uniformly mixing the solution A and a Fe (NO3) 3 solution, stirring and reacting for 12-14 hours to form sol, dehydrating for 6-8 hours at the temperature of 200-400 DEG C, and calcining for 5-8 hours at the temperature of 800-1000 DEG C to obtain ScFeO3 powder; and carrying out cold press molding on the ScFeO3 powder, and calcining at the temperature of 1200-1500 DEG C for 2-4 hours to obtain the ScFeO3 wave-absorbing ceramic with the 3D network microstructure. The nanowire is formed in the ScFeO3 wave-absorbing ceramic, the ScFeO3 particles and the nanowire construct a 3D network microstructure, abundant microwave interfaces are provided, and a multi-stage channel is provided for rapid transmission of microwave energy.

Description

technical field [0001] The present invention relates to a ScFeO with 3D network microstructure 3 A preparation method of wave absorbing ceramic belongs to the technical field of microwave absorbing materials. Background technique [0002] "Thin, light, wide and strong" is the development goal of new electromagnetic wave absorbing materials. "Thin" means that the thickness of the absorbing material is as thin as possible; "Light" requires the use of lightweight absorbing materials with low density; "Broad" requires that the absorbing material has a good response to electromagnetic waves in various frequency ranges of the radar band ; "Strong" means that the absorbing material can absorb the energy of electromagnetic waves to the maximum extent. [0003] The traditional ceramic matrix has a relatively high real part of the dielectric constant, and a large number of electromagnetic waves will be reflected on the surface of the material. SUMMARY OF THE INVENTION [0004] Ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/622C04B35/64
CPCC04B35/2675C04B35/622C04B35/64C04B2235/96C04B2235/9669C04B2235/656C04B2235/6567C04B2235/668
Inventor 魏汉军赵峰王清远余亚苹
Owner CHENGDU UNIV