scholarly journals Preparation and properties of CF–Fe3O4–BN composite electromagnetic wave-absorbing materials

RSC Advances ◽  
2020 ◽  
Vol 10 (19) ◽  
pp. 11121-11131 ◽  
Author(s):  
Wei Ye ◽  
Qilong Sun ◽  
Xiaoyun Long ◽  
Yingying Cai
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Fiber ◽  
Boron Nitride ◽  
Absorbing Materials ◽  
Absorbing Material

A three-layered electromagnetic (EM) wave-absorbing material was prepared by depositing a Fe3O4 and boron nitride (BN) coating onto the surface of a carbon fiber (CF) by in situ hybridization.

Radar Absorbing Materials Based on Metamaterials

2010 ◽  
Vol 75 ◽  
pp. 215-223
Author(s):  
Andrey Nikolayevich Lagarkov ◽  
Vladimir Nikolayevich Kisel ◽  
Vladimir Nikolayevich Semenenko
Keyword(s):  
Electromagnetic Wave ◽  
Reflection Coefficient ◽  
Frequency Band ◽  
Radar Absorbing Material ◽  
Wide Range ◽  
Absorbing Materials ◽  
Different Types ◽  
Absorbing Material ◽  
Wave Incidence

The use of metamaterial for design of radar absorbing material (RAM) is discussed. The typical features of the frequency dependencies of , , ,  of composites manufactured of different types of resonant inclusions are given as an example. The RAM characteristics obtained by the use of the composites are given. It is shown that it is possible to use for RAM design the metamaterials with both the positive values of ,  and negative ones. Making use of the frequency band with negative  and  it is possible to create a RAM with low reflection coefficient in a wide range of the angles of electromagnetic wave incidence.

scholarly journals In situ formation of Fe3O4/N-doped carbon coating on the surface of carbon fiber with improved electromagnetic wave-absorption property

RSC Advances ◽  
2020 ◽  
Vol 10 (51) ◽  
pp. 30443-30450
Author(s):  
Qilong Sun ◽  
Yue Ji ◽  
LiFen He ◽  
Xiaoyun Long
Keyword(s):  
Carbon Fiber ◽  
Carbon Coating ◽  
High Strength ◽  
Alkali Resistance ◽  
Wave Absorption ◽  
Military Equipment ◽  
Acid And Alkali Resistance ◽  
Absorbing Material ◽  
In Situ Formation

Carbon fiber is an absorbing material with high strength, acid and alkali resistance, high temperature resistance, flexibility, and processability and plays an important role in the electromagnetic (EM) wave absorption of civil buildings and military equipment.

scholarly journals In situ synthesis and electromagnetic wave absorbing properties of sandwich microstructured graphene/La-doped barium ferrite nanocomposite

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 37276-37285 ◽  
Author(s):  
Tingkai Zhao ◽  
Wenbo Jin ◽  
Yixue Wang ◽  
Xianglin Ji ◽  
Huibo Yan ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Reflection Loss ◽  
Barium Ferrite ◽  
In Situ Synthesis ◽  
Frequency Bandwidth ◽  
Absorbing Materials ◽  
Long Time ◽  
La Doped ◽  
High Reflection

The development of high reflection loss and broad frequency bandwidth for electromagnetic wave absorbing materials has been pursued for a long time.

scholarly journals Hollow MoC/NC Sphere for Electromagnetic Wave Attenuation: Direct Observation of Interfacial Polarization on Nanoscale Hetero-interfaces

2022 ◽  
Author(s):  
Huabin Zhang ◽  
Renchao Che ◽  
Luxi Zhang ◽  
Wenhuan Huang ◽  
Wenming Gao ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Dielectric Loss ◽  
Direct Observation ◽  
Wave Attenuation ◽  
Interfacial Polarization ◽  
Absorbing Materials ◽  
Carbon Based

Carbon-based composites with hetero-interfaces is a group of promising electromagnetic wave absorbing materials (EWAMs) for its excellent dielectric loss. For developing this kind of EWAM, in situ constructing hetero-interfaces and...

Comparison Analysis of Absorption Properties for Microwave Absorbent

2012 ◽  
Vol 512-515 ◽  
pp. 1132-1135
Author(s):  
Xu Liang Lü ◽  
Chao Wu ◽  
Zhao Yang Zeng
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Fiber ◽  
Impedance Matching ◽  
Electromagnetic Parameter ◽  
Comparison Analysis ◽  
Absorption Properties ◽  
High Permittivity ◽  
X Band ◽  
Absorbing Materials ◽  
Microwave Absorbing

In order to compare the absorbing properties of different microwave-absorbing agents and their mixture, this paper has selected two typical microwave-absorbing agents which respectively are carbon fiber resistance microwave-absorbing agents and ferrite magnetism microwave-absorbing agents, and took them as monolayer absorbing materials. Then used MG formula to calculate the effective electromagnetic parameter of their mixture under different proportion at X band, and finally analyzed their absorbing properties separately. Then through contrasting the impedance matching characteristic and attenuation coefficient of the materials, it is proved that adding carbon fiber in ferrite can not improve absorption properties. Although the ability of attenuating electromagnetic wave would be enhanced when resistance materials and magnetism materials are blend with each other, doping will destroy the materials’ impedance matching characteristic because most resistance materials have high permittivity. It makes reflection strengthen and can not improve absorbing properties.

A Model Updating Technique Based on the Constitutive Relation Error for In Situ Identification of Admittance Coefficient of Sound Absorbing Materials

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Aurélie Progneaux ◽  
Philippe Bouillard ◽  
Arnaud Deraemaeker
Keyword(s):  
Constitutive Relation ◽  
Model Updating ◽  
Test Case ◽  
Important Place ◽  
Acoustical Properties ◽  
Absorbing Materials ◽  
Absorbing Material ◽  
Constitutive Relation Error ◽  
Faulty Sensors

The development of new absorbing materials and the description of their acoustical properties take an important place in the current acoustical researches. This paper focuses on the identification of the admittance coefficient of sound absorbing material from in situ measurements, using the constitutive relation error (CRE)-based updating technique. This technique consists of a two-stage approach, allowing to regularize the inverse problem. Moreover, the technique allows the detection of faulty sensors and therefore the correction of the erroneous measurements before the updating process. The technique is developed, in a first part of this paper, for acoustical problems with generalized boundary conditions, and illustrated, in a second part, on a numerical and a physical two-dimensional (2D) test case.

Research and Application of Electromagnetic Wave Absorbing Materials in Microwave Melting Ice and Snow Road

2019 ◽  
Vol 815 ◽  
pp. 188-194
Author(s):  
Zheng Zhong Li ◽  
Chao Qing Zhang ◽  
Ming Yang Li ◽  
Hui Ran Pi ◽  
San Qiang Yang
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Fiber ◽  
Microwave Irradiation ◽  
Steel Fiber ◽  
Magnetic Loss ◽  
Magnetite Ore ◽  
Heating Mechanism ◽  
Absorbing Materials ◽  
Road Performance ◽  
Application Prospects

The heating mechanism of electric and magnetic loss materials under microwave irradiation is expounded. The heating rate, material composition and road performance of four kinds of microwave ice and snow roads including carbon fiber, magnetite ore, steel fiber and ferrite are reviewed. And analyze their respective characteristics and applicable conditions. The problems existing in microwave melting ice and snow technology are discussed, and the application prospects of electromagnetic wave absorbing materials in microwave melting ice and snow road are prospected.

Boron nitride dots In-situ embedded in a B2O3 matrix with the long lifetime Room-Temperature phosphorescence in dry and wet states

2021 ◽  
Vol 417 ◽  
pp. 129175
Author(s):  
Shenghui Han ◽  
Gang Lian ◽  
Xu Zhang ◽  
Zhaozhen Cao ◽  
Qilong Wang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Long Lifetime
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