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Low-temperature foaming process for batch preparation of thin-layer carbon-loaded nano ZnO wave-absorbing material

A wave-absorbing material and thin-layer technology, applied in aerospace and electromagnetic absorption fields, can solve problems such as weakening electromagnetic impedance matching

Active Publication Date: 2020-10-23
SHANDONG UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Porous carbon is a typical dielectric loss material with good electromagnetic absorption performance, but based on its absorption mechanism, only the dielectric loss weakens the electromagnetic impedance matching

Method used

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  • Low-temperature foaming process for batch preparation of thin-layer carbon-loaded nano ZnO wave-absorbing material
  • Low-temperature foaming process for batch preparation of thin-layer carbon-loaded nano ZnO wave-absorbing material
  • Low-temperature foaming process for batch preparation of thin-layer carbon-loaded nano ZnO wave-absorbing material

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Experimental program
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Embodiment 1

[0025] Take 1 g of glucose and 2 g of zinc nitrate and dissolve them in 10 ml of deionized water to form a uniformly mixed solution. The prepared solution was moved to a blast drying oven, dried at 120° C. for 12 hours, and foamed and polymerized to obtain a porous and light expanded precursor. The prepared precursor was transferred to a tube furnace, and the temperature was raised to 700°C at 5°C / min under a protective atmosphere of nitrogen, and kept at 700°C for 2 hours. After annealing, a thin layer of carbon-supported nano-ZnO composite material was obtained. Then heat the composite material and the wave-transmitting material according to the ratio of material: paraffin = 1:10 until they are evenly mixed, press them into an annular tube with an outer diameter of 7.0 mm and an inner diameter of 3.0 mm, and test its wave-absorbing performance.

[0026] figure 1 It is a diagram of the expanded precursor foamed and polymerized under the low-temperature foaming method in Exam...

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Abstract

The invention provides a low-temperature foaming process for batch preparation of a thin-layer carbon-loaded nano ZnO wave-absorbing material. The process comprises the following steps: by using glucose and zinc nitrate as raw materials, dissolving glucose and metal zinc nitrate in deionized water at room temperature to form a uniform single mixed solution, and transferring the mixed solution to ablast drying oven; and under the condition of 120 DEG C, foaming and expanding to form a porous and light precursor, and carrying out heat treatment at 700 DEG C to obtain the thin-layer carbon-loaded nano ZnO wave-absorbing material. The method belongs to the field of aerospace and electromagnetic absorption, the pore structure of the composite material can be regulated and controlled through alow-temperature foaming method, the preparation process is simple, the prepared wave-absorbing material is excellent in wave-absorbing performance, small in thickness and light in weight, the problemthat a traditional wave-absorbing material is narrow in wave-absorbing frequency band is solved, and X and Ku wave bands can be completely covered. The low-temperature foaming method is expected to bepopularized as a universal porous thin-layer carbon-loaded nano metal oxide wave-absorbing material, and lays an experimental foundation for establishing a variable relationship between a porous structure and wave-absorbing performance in the later period.

Description

technical field [0001] The invention belongs to the fields of aerospace and electromagnetic absorption, in particular to a low-temperature foaming process for preparing thin-layer carbon-loaded nano-ZnO wave-absorbing materials in batches. Background technique [0002] Absorbing material refers to a type of material that can effectively absorb incident electromagnetic waves and convert electromagnetic energy into heat energy, thereby significantly weakening the echo material. The absorbing material with ideal comprehensive performance should have the characteristics of "thin, light, wide and strong", that is, the material has small thickness, low density, wide absorption bandwidth and strong absorption strength, and the material should also have good physical and chemical stability, etc. . In recent years, with the expansion of electromagnetic wave application scenarios and application fields, the wide application of electromagnetic waves has brought serious electromagnetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00C01B32/05C01G9/02B82Y40/00B82Y30/00C08L91/06C08K13/06C08K9/12C08K7/24C08K3/22
CPCH05K9/0081C01B32/05C01G9/02B82Y40/00B82Y30/00C08K13/06C08K9/12C08K7/24C08K3/22C01P2004/80C08K2003/2296C08K2201/011C08L91/06
Inventor 丁春艳吴松松张文婷温广武
Owner SHANDONG UNIV OF TECH
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