Microwave absorption properties of rare earth alloy Nd2Co17@C/Na2SiO3 composite at elevated temperature (293–723 K) in X band

2021 ◽  
Author(s):  
yang zou ◽  
Zhao hui Qi ◽  
Zuying Zheng ◽  
Donglin He ◽  
Guowu Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Raw Material ◽  
Absorption Properties ◽  
Rare Earth Alloy ◽  
X Band ◽  
Absorbing Materials ◽  
Before And After ◽  
Absorbing Material ◽  
Microwave Absorbing

Abstract A variety of new challenges are being faced in the development of high temperature microwave absorbing materials in the X band. Recently, some of the 2:17 phase rare-earth soft magnetic alloys with high permeability and curie temperature have potential to be a novel X band high temperature microwave absorbing material. In this paper, a high temperature microwave absorbing material (Nd2Co17@C/Na2SiO3) is prepared with Nd2Co17 as a raw material. After carbon cladding and Na2SiO3 treatment, the composite can work stably at 723 K. The calculated absorption properties display that the reflection loss (RL) intensity of the composite with a thickness of 1.5 mm is below -6 dB in the whole X band. Moreover, the thermogravimetric (TG) analysis results and static magnetic properties before and after sintering indicate that the material has excellent resistance to oxidation. Rare earth alloy materials provide a new possibility for the research of innovative high temperature absorbing materials.

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.

scholarly journals Controlling the electric permittivity of honeycomb-like core–shell Ni/CuSiO3 composite nanospheres to enhance microwave absorption properties

RSC Advances ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 1172-1180 ◽  
Author(s):  
Rambabu Kuchi ◽  
Taha Latif ◽  
Sung Woo Lee ◽  
Viet Dongquoc ◽  
Phuoc Cao Van ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Impedance Matching ◽  
Core Shell ◽  
Electric Permittivity ◽  
Next Generation ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Materials ◽  
Absorbing Materials ◽  
Microwave Absorbing

Controlling impedance matching and enhancing absorption properties are crucial for developing next-generation microwave absorbing materials.

Understanding the high temperature reversed yield asymmetry in a Mg-rare earth alloy by slip trace analysis

2018 ◽  
Vol 145 ◽  
pp. 264-277 ◽  
Author(s):  
C.M. Cepeda-Jiménez ◽  
C. Prado-Martínez ◽  
M.T. Pérez-Prado
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Trace Analysis ◽  
Slip Trace ◽  
Rare Earth Alloy

Recent Progresses of High-Temperature Microwave-Absorbing Materials

NANO ◽  
2018 ◽  
Vol 13 (06) ◽  
pp. 1830005 ◽  
Author(s):  
Zirui Jia ◽  
Kejun Lin ◽  
Guanglei Wu ◽  
Hui Xing ◽  
Hongjing Wu
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Ceramic Matrix Composites ◽  
Cost Effective ◽  
Matrix Composites ◽  
Ceramic Fibers ◽  
Creative Commons ◽  
Microwave Absorbing Materials ◽  
Absorbing Materials ◽  
Microwave Absorbing

Generally, certain parts of aircraft and weapons, for example, head cone, engine inlet and nozzle, need to be resistant to high-temperature and high-speed heat flow. In order to meet the requirement of stealth of these special parts, the high-temperature structural absorbing materials, for example, ceramic fibers, ceramic matrix composites and creative commons (C/C) materials are being actively developed at home and abroad. Continuous and increasing efforts have also been made in the last decade aiming at developing excellent electromagnetic (EM) wave absorbents, for example, SiC working at high temperature. An ideal EM absorber should be relatively lightweight, thermally stable, capable of broad absorbing frequency and cost effective. Different kinds of high-temperature absorbers including ceramics, carbon-based materials, ferromagnetic materials and metal oxides have been summarized and discussed in this review. This review intends to inspire new concepts and approaches for designing excellent high-temperature microwave-absorbing materials.

scholarly journals Comparative Study on Microwave Absorbing Heating Characteristics and Microwave Deicing Performance of Airport Pavement Modified Concrete

2021 ◽  
Author(s):  
He Huang ◽  
Jinyu Xu ◽  
Junliang Liu ◽  
Haowen Chen
Keyword(s):  
Mechanical Properties ◽  
Practical Significance ◽  
Weak Links ◽  
Main Research ◽  
Airport Pavement ◽  
Microwave Effect ◽  
Absorbing Materials ◽  
Absorbing Material ◽  
Microwave Absorbing ◽  
Pavement Concrete

Abstract In this paper, the airport pavement concrete has been taken as the main research object, three kinds of absorbing materials, namely silicon carbide (SiC), iron oxide (Fe3O4) and graphite, have been respectively mixed into the concrete, and an open microwave testing system has been established. Based on this system, the basic mechanical properties, microwave heating characteristics, microwave deicing effect and its influencing factors of modified concrete are systematically studied. In addition, a comparative analysis of the influence mechanism of different absorbing materials on the strength and absorbing performance of pavement concrete is carried out. The results showed that the addition of SiC, Fe3O4, and graphite could effectively enhance the microwave effect of pavement concrete, and the more the addition, the more obvious the improvement. Furthermore, under the same mixing amount, the degree of improvement of microwave deicing performance of each absorbing material from large to small is graphite, Fe3O4, SiC. However, the addition of graphite will form several weak links in concrete, thereby reducing its overall mechanical properties. SiC can slightly improve the mechanical properties of pavement concrete, but it has no significant effect on the microwave absorption properties. With the addition of Fe3O4, the strength of concrete changes little, and the effect of microwave absorbing heating and microwave deicing is remarkable. In general, the comprehensive performance of microwave deicing of Fe3O4 modified concrete is optimal. This study has high scientific and practical significance, and can be widely applied to deicing projects on airports and high-grade highways.

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