scholarly journals MoS2-Decorated/Integrated Carbon Fiber: Phase Engineering Well-Regulated Microwave Absorber

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Jing Yan ◽  
Ying Huang ◽  
Xiangyong Zhang ◽  
Xin Gong ◽  
Chen Chen ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Fiber ◽  
Microwave Absorption ◽  
Hydrothermal Route ◽  
Absorption Mechanism ◽  
Guest Molecules ◽  
The Matrix ◽  
One Step ◽  
New Type ◽  
Phase Engineering

AbstractPhase engineering is an important strategy to modulate the electronic structure of molybdenum disulfide (MoS2). MoS2-based composites are usually used for the electromagnetic wave (EMW) absorber, but the effect of different phases on the EMW absorbing performance, such as 1T and 2H phase, is still not studied. In this work, micro-1T/2H MoS2 is achieved via a facile one-step hydrothermal route, in which the 1T phase is induced by the intercalation of guest molecules and ions. The EMW absorption mechanism of single MoS2 is revealed by presenting a comparative study between 1T/2H MoS2 and 2H MoS2. As a result, 1T/2H MoS2 with the matrix loading of 15% exhibits excellent microwave absorption property than 2H MoS2. Furthermore, taking the advantage of 1T/2H MoS2, a flexible EMW absorbers that ultrathin 1T/2H MoS2 grown on the carbon fiber also performs outstanding performance only with the matrix loading of 5%. This work offers necessary reference to improve microwave absorption performance by phase engineering and design a new type of flexible electromagnetic wave absorption material to apply for the portable microwave absorption electronic devices.

Investigation on Dynamic Compressive Properties of Carbon Fiber Cloth-Reinforced Titanium Alloy

2013 ◽  
Vol 815 ◽  
pp. 221-226 ◽  
Author(s):  
Teng Teng Wu ◽  
Jin Xu Liu ◽  
Shu Kui Li ◽  
Qiu Rong Yang
Keyword(s):  
Carbon Fiber ◽  
Strain Rate ◽  
Dynamic Compression ◽  
Compressive Property ◽  
Reinforcement Effect ◽  
Absorption Mechanism ◽  
Compression Properties ◽  
Carbon Fiber Cloth ◽  
Significant Difference ◽  
The Matrix

Cu-coated carbon fiber cloth/Ti-6Al-4V composite (Cu-Cf/TC4) and uncoated-Cf/TC4 were fabricated by spark plasma sintering (SPS) method. The microstructure and dynamic compression properties of the Cf/TC4 composites were investigated. Results show that the matrix-fiber interfacial bonging in uncoated-Cf/TC4 is weaker than in Cu-Cf/TC4. Moreover, lamellar TiC exists throughout the TC4 matrix in uncoated-Cf/TC4, while there is no TiC generated in TC4 matrix of Cu-Cf/TC4. Dynamic compressive tests indicate the stress-strain curves of Cu-Cf/TC4 and uncoated-Cf/TC4 show no difference at a strain rate of 2500 s-1, while show significant difference at a strain rate of 4800 s-1. Further investigations find: (1) at a strain rate of 2500 s-1, the reinforcement effect of Cf on Cu-Cf/TC4 is similar to TiC on uncoated-Cf/TC4, explaining the exact similarity in compressive property of Cu-Cf/TC4 and uncoated-Cf/TC4; (2) at a strain rate of 4800 s-1 the reinforcement effect of Cf on Cu-Cf/TC4 is far more than TiC on uncoated-Cf/TC4, explaining the higher compressive strength of Cu-Cf/TC4; moreover, multiple debonding of carbon fiber and its squeezing into TC4 matrix constitute an important energy absorption mechanism for uncoated-Cf/TC4, explaining the better plasticity of uncoated-Cf/TC4.

scholarly journals Microwave absorption properties of lightweight and flexible carbon fiber/magnetic particle composites

RSC Advances ◽  
2018 ◽  
Vol 8 (44) ◽  
pp. 24780-24786 ◽  
Author(s):  
Wei Ye ◽  
Wei Li ◽  
Qilong Sun ◽  
Jin Yu ◽  
Qiang Gao
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Fiber ◽  
Microwave Absorption ◽  
Magnetic Particle ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Carbon Based

Hybridized-carbon-based materials with magnetic metals and oxides have attracted much attention because of their enhanced electromagnetic wave loss.

scholarly journals Effects of the Carbon Fiber-Carbon Microcoil Hybrid Formation on the Effectiveness of Electromagnetic Wave Shielding on Carbon Fibers-Based Fabrics

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2344 ◽  
Author(s):  
Hyun-Ji Kim ◽  
Sung-Hoon Kim ◽  
Sangmoon Park
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Fiber ◽  
Nonwoven Fabric ◽  
Woven Fabrics ◽  
Dramatic Improvement ◽  
Shielding Effectiveness ◽  
Absorption Mechanism ◽  
Nonwoven Fabrics ◽  
Hybrid Formation ◽  
Electrical Conductivities

Carbon fiber-carbon microcoil (CF-CMC) hybrids were formed on carbon fiber (CF)-based fabric. The morphologies of CF-based fabrics and CF-CMC hybridized fabrics were investigated. The electrical conductivities of the CF-CMC hybridized fabrics were examined and compared with those of native CF-based fabrics. Furthermore, the electromagnetic wave shielding effectiveness (SE) of the CF-CMC hybridized fabrics was investigated across operating frequencies in the 8.0–12.0 GHz range, and the results were compared with those for native CF-based fabrics. For the CF-based nonwoven fabrics, the SE values were improved by the CF-CMC hybridization reaction, although the electrical conductivities of the nonwoven fabric were reduced by the CF-CMC hybrid formation. For the CF-based woven fabrics, the SE values were improved by more than twofold throughout the entire range of frequencies, owing to the CF-CMC hybrid formation. This dramatic improvement was partly ascribed to the enhanced electrical conductivity, particularly in the transverse direction to the individual CFs. Owing to the increased thickness of the woven or nonwoven fabrics after the CF-CMC hybrid formation and the intrinsic characteristics of CMCs, the absorption mechanism for the SE was determined for the main factor that contributed to the improvement of the SE values.

scholarly journals Prediction of Effective Thermal Conductivities of Four-Directional Carbon/Carbon Composites by Unit Cells with Different Sizes

2021 ◽  
Vol 11 (3) ◽  
pp. 1171
Author(s):  
Chang Xu ◽  
Zhihong Sun ◽  
Guowei Shao
Keyword(s):  
Carbon Fiber ◽  
Longitudinal Direction ◽  
Unit Cell ◽  
Carbon Composites ◽  
Temperature Boundary ◽  
The Matrix ◽  
Unit Cells ◽  
Experimental Values ◽  
Different Diameters ◽  
Thermal Conductivities

Two-unit cells developed to predict the effective thermal conductivities of four-directional carbon/carbon composites with the finite element method are proposed in this paper. The smaller-size unit cell is formulated from the larger-size unit cell by two 180° rotational transformations. The temperature boundary conditions corresponding to the two-unit cells are derived, and the validity is verified by the temperature and heat flux distributions at specific positions of the larger-size unit cell and the smaller-size unit cell. The thermal conductivities of the carbon fiber bundles and carbon fiber rods are measured firstly. Then, combined with the properties of the matrix, the effective thermal conductivities of the four-directional carbon/carbon composites are numerically predicted. The results in transverse direction predicted by the larger-size unit cell and the smaller-size unit cell are both higher than experimental values, which are 5.8 to 6.2% and 7.3 to 8.2%, respectively. In longitudinal direction, the calculated thermal conductivities of the larger-size unit cell and the smaller-size unit cell are 6.8% and 6.2% higher than the experimental results, respectively. In addition, carbon fiber rods with different diameters are set to clarify the influence on the effective thermal conductivities of the four-directional carbon/carbon composites.

ZnS nanowall coated Ni composites: facile preparation and enhanced electromagnetic wave absorption

RSC Advances ◽  
2014 ◽  
Vol 4 (105) ◽  
pp. 61219-61225 ◽  
Author(s):  
Biao Zhao ◽  
Gang Shao ◽  
Bingbing Fan ◽  
Wanyu Zhao ◽  
Yajun Xie ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Microwave Absorption ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Facile Preparation

The microwave absorption properties of ultrathin ZnS wall-coated Ni composites were superior to those of Ni microspheres and ZnS particles.

scholarly journals The research on precise forming technology of “λ” type composite skin

2021 ◽  
Vol 30 ◽  
pp. 263498332199474
Author(s):  
Qiang Guo ◽  
Kai He ◽  
Hengyuan Xu ◽  
Youyi Wen
Keyword(s):  
Carbon Fiber ◽  
Middle Layer ◽  
Fiber Reinforced ◽  
Process Verification ◽  
Forming Technology ◽  
Fiber Reinforced Materials ◽  
New Type ◽  
Carbon Fiber Reinforced ◽  
Type Composite ◽  
Reinforced Materials

With the application of “ λ” type composite skin becoming more and more extensive and diversified, its precise forming technology is also widely concerned. This article mainly solves the quality problems of “ λ” type corner area, such as delamination dispersion and surface wrinkle, which exist in reality commonly in the manufacturing process. The prepreg is heated along the corner area of the tooling to solve the problem that prepreg is difficult to be compacted due to the large modulus of carbon fiber in “ λ” type corner area. Furthermore, two precompaction tests are creatively increased at 16 layers (middle layer) and 32 layers (last layer) for the thick structure, respectively, to ensure the compaction effect of the blank. In addition, combined with the characteristics of highly elastic rubber and carbon fiber-reinforced materials, a new type of soft mold structure with proper flexibility and good stiffness is proposed innovatively through the reasonable placement of carbon fiber-reinforced materials and the setting of exhaust holes according to the structure characteristics of “ λ” type root skin. Through further process verification, it is shown that the improved process has effectively solved the problems of wrinkles and internal delamination at the sharp corners of parts and realized zero-defect manufacturing of “ λ” type root skin for the first time.

A Review on R&D Status and Application of Fly Ash Cenospheres in Microwave Absorption

2013 ◽  
Vol 634-638 ◽  
pp. 1886-1889 ◽  
Author(s):  
Jing Zhang ◽  
Jiang Long Yu ◽  
Ping Yang Wang ◽  
Huan Zhao
Keyword(s):  
Surface Modification ◽  
Electromagnetic Wave ◽  
Fly Ash ◽  
Research And Development ◽  
Microwave Absorption ◽  
State Of The Art ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Art Research ◽  
Fly Ash Cenospheres

The paper provides an overview of surface modification and application of fly ash cenospheres. The state of the art research and development of electromagnetic wave absorption materials based on surface treated fly ash cenospheres are summarized.

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