CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Ping Gong,Yan Li,Chenxing Xin,Qiaoyu Chen,Liang Hao,Qinglei Sun,Zheng Li
An effective method to fabricate barium titanate (BTO)/carbonyl iron powder (CIP) composites with enhanced microwave absorption (MA) performance was prepared via multimaterial digital optical processing (DLP) 3D printing technique. The bilayer-gradient honeycomb structural absorber (BGHSA) with adjustable broadband can be obtained by leveraging of varying compositional and structural design (layered thickness ratios , and gradient structures). The optimal reflection loss ( R L ) value and effective bandwidth of BGHSA can reach −51 dB and 15.4 GHz, respectively, exhibiting a distinct improvement ( R L increased by 32.4% and effective bandwidth by 42.9%) compared with the reference. The highly improved performances especially in the broadband absorption (15.4 GHz) were mainly attributed to the better impedance matching and waves multi-reflections. This work provides a promising strategy to fabricate functionally graded materials for potential application in the absorption of electromagnetic waves .
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Magnetochemistry
·
2024
·Vol. 10
·期 4
·23
·
IF 2.6
Yang Liu,Rui Wang,Kaixuan Li,Ran Chen,Zhaoyang Wu,Yang Li
This study proposes the thermal decomposition of salt compounds and doping of carbonyl iron powders (CIPs) to optimize the preparation of an insulating layer through the solid-phase interface reaction. First, (Fe–Si–Cr + CIPs)/ZnSO4composite powders were synthesized using the hydrothermal method and (Fe–Si–Cr + CIPs)/ZnO·SiO2·Cr2O3SMCs with a ZnO·SiO2·Cr2O3composite insulation layer were prepared through heat treatment and cold pressing. The effect of the CIP doping content on the microstructure and magnetic properties of the (Fe–Si–Cr + CIPs)/ZnO·SiO2·Cr2O3SMCs were then investigated. During the heat treatment, ZnSO4decomposed into solid ZnO and gaseous SO2and O2. The O2drives the solid-phase reaction, prompting the migration of nonmagnetic Si and Cr atoms from the interior of the Fe–Si–Cr soft magnetic powder to the surface insulation layer, finally forming the ZnO·SiO2·Cr2O3insulation layer. The doped CIPs also show good plasticity during the coating process, combining with the coating layer to fill the internal pores of SMCs. Moreover, as the particles are small with a high surface area, they increase the number of reaction sites for ZnSO4decomposition and facilitate the growth of the composite insulation layer, promoting its uniform distribution on the surfaces of the soft magnetic powders and CIPs. The lattice mismatch between the insulation layer and soft magnetic powder is reduced while the magnetic-phase content is increased, allowing the effective doping of CIPs sin the insulation layer. The magnetic properties of SMCs can be precisely regulated by changing the doping amount of CIPs. Unlike other insulating layer–preparation strategies based on the interfacial solid-phase reaction, the proposed method exploits the high plasticity and specific surface area of CIPs and removes the lattice mismatch between the insulation layer and soft magnetic powder.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 12
·4397
·
IF 3.4
Siyuan Yang,Fei Wang,Zhe Zhang,Zhiming Liu,Jiliang Zhang,Kaiyong Jiang
Electromagnetic (EM) wave absorption performance is greatly affected by the microscopic morphology of the absorbing material particles. In this study, a facile and efficient ball-milling method was applied to increase the aspect ratio of particles and prepare flaky carbonyl iron powders (F-CIPs), one of the most readily commercially available absorbing materials. The effect of ball-milling time and rotation speed on the absorption behaviors of the F-CIPs was investigated. The microstructures and compositions of the F-CIPs were determined using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The EM parameters were measured using a vector network analyzer (VNA) in the frequency range of 2–18 GHz. The results indicated that the ball-milled flaky CIPs exhibited a better absorption ability than the raw spherical CIPs. Among all the samples, the sample milled at 200 r/min for 12 h and the sample milled at 300 r/min for 8 h showed remarkable EM parameters. The ball-milling sample with 50 wt.% F-CIPs had a minimum reflection loss peak of −14.04 dB at a thickness of 2 mm and a maximum bandwidth (RL < −7 dB) of 8.43 GHz at a thickness of 2.5 mm, a result that conformed with the transmission line theory. Hence, the ball-milled flaky CIPs were considered to be beneficial for microwave absorption.Keywords:carbonyl iron powders;absorption performance;ball-milling time;ball-milling rotation speed;electromagnetic parameters
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Wenqian Wang,Fanya Jin,Jingke Pei,Fuzhen Qu,Yumin Zhang,Ye Zheng,Honglei Chang,Yadong Lv
The rapid advancement of electromagnetic technologies and the growing threats of interference highlight the urgent need for the development of robust electromagnetic wave absorbing (EWA) coatings to safeguard critical systems and ensure environmental safety. However, their effectiveness is often limited by poor corrosion and aging resistance. To enhance the durability of these coatings, we developed an epoxy (EP)-based coating using fluorinated flaky carbonyl iron powder (F-FCI) as the absorbing filler. Hydrophobic F-FCI particles were synthesized using perfluoro-decyl trimethoxy-silane (PFDTMS) to effectively block corrosive ions. Electrochemical tests demonstrated that the fluorinated layer significantly improved the corrosion resistance while remained decent electromagnetic wave absorption properties of FCI. We further evaluated the performance of EP/FCI and EP/F-FCI coatings under salt spray corrosion tests, finding that the EP/F-FCI coating exhibited minimal structural changes and color differences while maintaining strong hydrophobic performance during aging. These results indicate that incorporating F-FCI particles substantially enhances the corrosion resistance and service stability of EWA coatings.
研究领域:
材料科学
·
腐蚀与防护
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
WEAR
·
2023
·
IF 5
Pan Wu,Tianyu Yu,Guotai Li,Mingjun Chen
Fabrication of composites with anisotropic properties by additive manufacturing has drawn great attention in recent years. Magnetic-assisted digital light processing (DLP) of micron-scale carbonyl iron powders (CIPs)/resin composites (MACRCs) with tunable microstructure and magnetic properties can be used as smart sensors/actuators in soft robots , aerospace/automobile applications and drug delivery devices due to their complex geometries and fast activation response. However, anisotropic, wear and mechanical properties remain unclear for MACRCs. This work aims to investigate their microstructure-function-wear resistance relationship. Photosensitive resin and CIPs with a concentration up to 5 wt% were prepared to print samples with different anisotropic magnetic properties, using magnetic field-assisted techniques. The results show that addition of CIPs in resin can still maintain good printability, while the mechanical properties deteriorate slightly as the micro-size CIPs reduced the interface bonding strength . Anisotropic magnetic properties were studied using the magnetization tests. In addition, wear tests showed that the coefficient of friction of samples decreases from 0.4938 (pure resin) to 0.4066 (MACRCs with 5 wt% CIPs), indicating improved wear resistance by the addition of CIPs. This work demonstrated that tunable magnetic and mechanical properties can be achieved by manipulation anisotropy of the magnetic nanoparticles using external magnetic field .
研究领域:
材料科学
·
制造工程
·
力学
✓ 已验证
DOI
高影响因子
Additive Manufacturing
·
2025
·
IF 11.1
Wei Xiao,Shaoqi Shi,Pei Liu,Zhilei Hao,Zhaoxia Tian,Qingqing Gao,Kai Xu,Yinxu Ni,Jin Chen,Changtian Zhu,Zhixiang Li,Gaojie Xu,Hui Zhang,Fenghua Liu
The integration of structure and material can endow microwave absorbers with excellent performance and broad application fields. However, its integrative manufacturing is extremely challenging, especially for the integration of functional materials and intelligent structures. In this context, the liquid crystal display (LCD) 4D printing was used to construct a kind of intelligent flexible double layer honeycomb sandwich structure by integrating multifunctional MXene@flake carbonyl iron powder (FCIP) and shape memory polymers (SMPs) resin. By controlling the applied time of the magnetic field, the structure with shape memory effect (SME) will be recovered to different radius of curvature ( R ) and center angle ( α ), which can endow the device with different absorption strengths and effective absorption bandwidth (EAB). When the α and R of the structure are 65.2° and 16.7 cm, the minimum reflection loss ( RL min ) measured by the bow method is −50.87 dB, and the EAB ( RL < −10 dB) reaches 13.8 GHz covering the C, X, and Ku bands. In addition, the applicability of smart structure devices in stealth technology is further confirmed by radar cross section (RCS) simulation, which is consistent with the conclusion of the measured results. This work enables the potential for rapid manufacturing of an intelligent, flexible, and ultra-broadband strong microwave absorbing device with integrated structure and function by 4D printing, which can be used in smart anti electronic reconnaissance, flexible wearable devices, and stealth technology.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 18
·11827-11840
·
IF 3.442
Zuo Yuxin,Yao Zhengjun,Lin Haiyan,Zhou Jintang,Guo Xinlu,Cai Haishuo
Carbonyl iron powder (CIP) coated with a layer of epoxy (EP) shell, denoted as core–shell CIP@EP composites, were designed and prepared via in situ polymerization. The CIP@EP composites containing 4.5–6.8 wt% EP were systematically characterized by X-ray diffraction, Fourier transform infrared spectroscopy, vibrating sample magnetometer, scanning and transmission electron microscopy, and vector network analyzer. The results indicated that CIP@EP composites with 9–254 nm EP shell thickness were successfully prepared through an efficient in situ polymerization method. The particle diameter of core CIP particles was 0.49–4.24 µm. The microwave absorption properties of the microspheres were then experimentally measured, and the CIP@EP composites exhibited a maximum reflection loss value of − 66.2 dB at 7.1 GHz at 2.0 mm absorber thickness. The effective absorbing bandwidth below − 10 dB was 8.0 GHz (from 10.0 to 18.0 GHz). The presence of the EP shell not only enhanced the microwave absorption performance of CIP@EP composites but also improved the overall chemical stability of CIP particles. The as-prepared CIP@EP composites may be a promising candidate for electromagnetic wave absorption applications, and the core–shell structure design can be extended to other microwave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 23
·9698-9707
·
IF 4.5
Zhang Cong,Chen Yanan,Feng Shuangjiu,Kan Xucai,Zhu Yong,Li Yue,Sun Wei,Shen Jibiao,Liu Xiansong
Currently, soft magnetic composites (SMCs) are usually used for high-current power devices. As a kind of SMCs, the FeSiAl magnetic powder core exhibits excellent magnetic properties, but it is difficult to improve its permeability and DC-bias characteristics. Thus, developing SMC s with high permeability and lower power loss remains a challenge. Here, the FeSiAl powder was mixed with carbonyl iron powder (CIP) which coated with nano-SiO 2 and pressed into toroidal magnetic core with silicon resin as adhesive. For MHz frequency, the SMCs with excellent power loss, saturation magnetization and permeability were obtained. Saturation magnetization of the mixed powder increased markedly with the CIP content increasing. For magnetic powder cores, the SEM and the mappings show that the large deformation CIP was helpful to improve core density. With the addition of CIP, the permeability and DC-bias properties were improved. In addition, the power loss was greatly reduced by the optimized annealing temperature.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Linbo Zhang,Haoyu Gao,Peng Zhang,Xianyu Jiang,Yujie Zhao,Liangjun Yin,Zhou Deng,Hanxuan Zhang,Jianliang Xie,Li Zhang,Haipeng Lu,Longjiang Deng
Magnetic metal absorbers are susceptible to strong corrosion in acid, alkali and salt fog environments, resulting in strong limitations of their applications. Therefore, it is urgent to develop magnetic absorber with enhanced anti-corrosion and microwave absorption. In this paper, carbonyl iron powder (CIP) coated with 2-methylimidazole/epoxy (2-MI/EP) composites were prepared by in-situ polymerization. The CIP@2-MI/EP composites showed better microwave absorption performance with a minimum reflection loss (RL min ) value of −54.11 dB at 9.69 GHz with 2 mm thickness. The electrochemical test results show that the corrosion current density of the composites decreases by two orders of magnitude and the corrosion potential is positively shifted to −0.1. In addition, the presence of 2-MI/EP layer can enhance the oxidation resistance of this composite. Considering the corrosion resistance , electromagnetic properties and oxidation resistance of this composite material, it provides an opportunity for valuable addition at commercial level.
研究领域:
材料科学
·
腐蚀与防护
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xingjian Dai,Quan Zhou,Lichao Dong,Chenzhi Zhang,Xinfang Zhang,Tuo Ping,Ruoting Lan,Pingan Yang,Yi Hou,Zhihao Bao,Shuang Yi,Jinsong Rao,Yuxin Zhang
The specific nanostructure of the absorber is a key factor in improving the electromagnetic absorption performance. Herein, NiFe layered double hydroxide composited with carbonyl iron powder (LDH/CIP) was fabricated by a one-step hydrothermal synthesis process for the first time. By varying the morphology of the CIP template (spherical or flaky), the nanostructure of in situ grown LDH could be modulated, to optimize the electromagnetic wave absorption performance of LDH. The resultant NiFe/CIP synergistic composite has proved its excellent electromagnetic (EM) wave absorption performance with the minimum reflection loss (RLmin) of −96.5 dB and an effective absorption bandwidth (EAB) up to 7.6 GHz at the thickness of 8 mm. At a smaller thickness of 3 mm, the EAB value remains 7.2 GHz with the RLmin of −16.4 dB. Such an outstanding absorption capacity is primarily attributed to the magnetic loss of NiFe LDH, which is more significantly enhanced using CIP as the substrate. Moreover, the formation of nano-flower-like LDHs, which possess rich heterogeneous structural interfaces and specific surface area to induce the polarization relaxation of the absorber. Therefore, the established NiFe/CIP composite brings insights into the design of high-performance EM wave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2022
·
IF 3.097
Yue Li,Xueai Li,Kexin Jin,Chunsheng Wang,Wanchun Guo,Kesong Tian,Haiyan Wang
The microwave absorbing materials (MAMs) applied in marine environment are confronted with corrosion, therefore, in order to guarantee the long-term function, the MAMs need to possess excellent microwave absorption performance and seawater corrosion resistance simultaneously. Carbonyl iron powder (CIP) has the characteristic of broadband response caused by magnetic loss, playing an important role in practical application as an MAM. Herein, to avoid the deterioration of microwave absorption property of CIP by seawater corrosion, protective layers of electroless plating Co(Ni) are introduced with less influence on magnetic loss. The CIP coated with Co layer (CIP@Co) shows the RL min of −57.93 dB and an effective absorption bandwidth (EAB) of 8.56 GHz, after a long-time continuous immersion in seawater, its RL min and EAB is −71.11 dB and 8.00 GHz, respectively. The EAB of CIP@Ni after immersing in seawater is also preserved 94 %, illustrating the long-life stability of the microwave absorption performance in seawater. The little effect of Co layer on the magnetic loss of CIP and the additional anticorrosion ability of electroless plating layers are two guarantees for enduring the excellent microwave absorption performance of CIP@Co in seawater. This work provides a solution to obtain MAMs with long-life excellent microwave absorption in seawater.
研究领域:
材料科学
·
海洋工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2022
·
IF 4.966
Jia Zheng,Zhaoxi Zhou,Lihong Zhu,Qihui Chen,Maochun Hong,Heqing Fu
A novel room temperature self-healing carbonyl iron powder/ polydopamine@ multi-walled carbon nanotubes (CIP/PDA@MWCNTs) composites as microwave absorber covering the whole X frequency band were prepared in this study. In order to improve the impedance matching and dispersion of CIP in composites, it was encapsulated by PDA to form a core-shell structure. Meanwhile, the polydopamine modified carbonyl iron powder (CIP/PDA) was mixed with MWCNTs to enhance the performance of microwave absorption , so that the the composites possessed dielectric and magnetic losses. Moreover, the composites have self-healing property. When the content of CIP/PDA@MWCNTs is 20 wt%, the minimum reflection loss of the self-healing composites is −30.69 dB, and the bandwidth of RL less than -10 dB can reach up to 9.44 GHz, covering the entire X. Therefore, this room temperature self-healing CIP/PDA@MWCNTs composite will become an ideal microwave absorbing material for novel function device.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）