Additive Manufacturing
·
2025
·
IF 11.1
Cunxian Wang,Haodong Wang,Lu Tang,Jimei Xue,Zhijun Wang,Hanjun Wei
Microwave absorbing structures are important for addressing challenges in complex electromagnetic (EM) and physical environments because they offer broadband absorption, a lightweight design, and mechanical load-bearing capabilities. Herein, this work employed vat photopolymerization 3D printing and polymer-derived ceramics (PDCs) technology to manufacture Re 2 O 3 -modified SiOC metamaterials, where Re refers to holmium (Ho), neodymium (Nd), and yttrium (Y). The materials feature a triply periodic minimal surface (TPMS) meta-structure inspired by the gyroid structure. The effects of different Re elements on the dielectric, magnetic, microwave absorption, and compression properties were investigated. Compared with the original SiOC, Ho 2 O 3 SiOC, and Y 2 O 3 SiOC ceramics, the Nd 2 O 3 SiOC ceramic demonstrated excellent absorption characteristics within the X band. It achieves a minimum reflection loss (RL min ) of 45.12 dB at 4.15 mm and an effective absorption bandwidth (EAB) spanning 4.2 GHz from 3.5 to 3.7 mm. This performance is attributed mainly to the TPMS meta-structure, which improves impedance matching. The Nd 2 O 3 particles enhance the dielectric and magnetic losses. The Nd 2 O 3 SiOC ceramic also demonstrated strong mechanical properties, with a maximum failure strength of 11.3 MPa and a Young’s modulus of 1.72 GPa. These results arise from the uniform dispersion and fine-scale distribution of Nd 2 O 3 within the SiOC matrix. The CST simulations indicate that the Nd 2 O 3 SiOC metamaterials cover the entire C-band (4–8.2 GHz), which is particularly effective within thicknesses ranging from 2.9 to 5.0 mm. Consequently, Nd 2 O 3 SiOC ceramics display substantial promise in both their low-frequency and broadband absorption capabilities, as well as in their mechanical load-bearing properties.
研究领域:
材料科学
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电磁学
·
结构工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Yiran Liu,Yimin Ouyang,Linwei Guo,Saidi Wang,Yihui Yang,Bin Du,Tao Zhang
Polymer-derived SiOC ceramics have demonstrated significant potential across various applications, including structure materials, energy, extreme thermal environments, and semiconductors. It is well-established that the carbon phase in SiOC plays a crucial role in determining the material's properties. However, the relationship between carbon phases and the mechanical properties of SiOC ceramics remains inadequately explored. In this study, a series of SiOC nanosphere powders with varying carbon content were successfully fabricated, and bulk samples were obtained using the spark plasma sintering (SPS) technique. The results demonstrate that both carbon content and sintering temperature play a synergistic role in determining the phase composition—such as the formation of SiC through carbothermal reduction—and the microstructural features, including densification and the distribution of free carbon in SiOC ceramics. These structural modifications significantly enhance the mechanical properties through multiple mechanisms. Among all the samples, the SiOC-C ceramics fabricated at 1600°C possess optimized mechanical properties, with a flexural strength of 38.48 MPa. These findings elucidate the potential mechanism for improving the mechanical properties of SiOC ceramics by introducing the carbon phase, which holds significant implications for the development of high-performance ceramic materials.
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2021
·Vol. 19
·期 2
·813-827
·
IF 1.968
Cong Zhou,Shuang Li,Zhaoju Yu
Iron-containing PSO precursors (FePSO) were synthesized by modification of polysiloxane with different amounts of ferric acetylacetonate [Fe(acac) 3 ], then porous SiFeCO ceramics were successfully prepared by subsequent pyrolysis. The chemical modification and ceramization process of PFSO precursors were studied by FT-IR and TGA measurements. XRD patterns imply that the SiC crystalline can be easily observed when PFSO was exposed to 1200℃ in nitrogen atmosphere, while pure PSO exhibited broad diffraction peaks of SiC at 1500℃, meaning that the grain coarsening of SiC was accelerated by adding iron. The crystallization behavior of ferric silicide (Fe x Si y ) is complex due to the variation of iron content in feed and annealing temperature, and Fe x Si y /SiC@SiOC nanocomposites were produced after annealing. Because of the in-situ formation of SiC, Fe x Si y , and carbon strips in nanocomposites, PFSO-derived ceramics demonstrate enhanced microwave absorption performance. The best effective absorption bandwidth (<−10 dB) and the minimum reflection loss are 2.6 GHz and −38 dB, respectively, which are achieved in the sample PFSO-3–1300℃. Fe x Si y /SiC@SiOC nanocomposites synthesized in this work exhibit potential application in the field of electromagnetic interference, the carbon content and the crystallization behavior of Fe x Si y are the critical factors for the performance optimization.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Ruyue Su,Jingyi Chen,Xueqin Zhang,Wenqing Wang,Rujie He,Ying Li
Terahertz (THz) electromagnetic interference (EMI) shielding materials with superior performance are urgently needed with the development of THz electronic devices. Herein, a photocured Ti3C2Tx MXene/SiOC ceramic (MSiOC) composite with a sandwich-like structure was prepared using a photosensitive resin as a precursor. In addition, the EMI shielding properties of the MSiOC composite with a low mass loading of the MXene were greatly improved. The influence of the content of Ti3C2Tx MXenes on the EMI shielding properties of the MSiOC composite was studied, and its EMI shielding mechanism was further elucidated. The resultant MSiOC composite exhibited an average shielding effectiveness (SET) of 24.5 dB in the frequency range of 0.2–1.6 THz at a MXene mass loading of only 0.3 wt%, which was remarkably improved by 53% compared to pure SiOC. In addition, the MSiOC composite with a broad high-absorptivity frequency band showed an absorption-dominated THz EMI shielding mechanism. This result proved that the synergistic effect of the MXene and SiOC was responsible for the high attenuation capability of MSiOC for THz waves. Finally, MSiOC with customized structures was easily fabricated via vat photopolymerization 3D printing, followed by a pyrolysis process. The smallest feature size of these structures was about 140 μm. Moreover, the flexible photocured green part could be secondary molded, which improved the structural controllability of the composite. Our work provides insights into the rational design of MXene-based composites for new-generation THz EMI shielding 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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jiale Liu,Zahoor Ahmad,Jianjun Chen
The continuous SiOC ceramic fibers were fabricated by a novel polyethylene oxide (PEO) assisted sol-gel method. The precursor fibers were prepared by a solution which viscosity and composition can be regulated. The solution with excellent spinning performance was constituted by the optimized composition of tetraethyl orthosilicate, methyltrimethoxysilane, sucrose, and PEO. The effects of the pyrolysis temperatures and C/Si ratios on the microstructure and mechanical properties of SiOC ceramic fibers were investigated. After pyrolysis at 1200 °C, the tensile strength of SiOC ceramic fibers was 182.5 MPa and the surface was uniform and dense. Furthermore, XPS and FTIR analysis confirmed the formation of Si–O–Si and Si–C bonds, demonstrating the existence of SiO 3 C after pyrolysis at 1200 °C. The oxidation and high-temperature resistance of the SiOC ceramic fibers were also investigated. The results showed their ability to withstand heat treatment at 1000 °C in air and 1200 °C in Ar. The continuous SiOC ceramic fibers have broad prospects for commercial application as the thermal protection and high temperature resistant material. And the novel PEO-assisted sol-gel method can be employed to fabricate various ceramic fibers.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ruyue Su,Jingyi Chen,Xueqin Zhang,Wenqing Wang,Rujie He,Hao Xu,Ying Li
Electromagnetic interference (EMI) shielding and absorption materials can effectively mitigate the undesired pollution or noise caused by terahertz (THz) waves. The development of THz EMI shielding materials that are primarily based on absorption mechanisms to avoid secondary pollution caused by reflection is still in big demand. Herein, an absorption-dominated precursor-derived SiOC ceramic (PDC-SiOC) architecture for THz wave EMI shielding and absorption was reported. The EMI shielding properties of the bulk SiOC ceramic were studied. More than 93 % of THz EM waves were absorbed by the synthesized SiOC ceramic from 1.2 to 1.6 THz. Furthermore, lightweight honeycomb-structured SiOC architecture which was inspired by the wings of moth was fabricated by vat photopolymerization 3D printing combined with following pyrolysis. The EMI shielding properties and mechanism of the honeycomb SiOC architecture in THz bands were also discussed. The highest shielding effectiveness (SE) of the honeycomb SiOC architecture was up to 64.1 dB, and the transmissivity was below 1.4 % from 0.2 to 1.6 THz. In addition, more than 97–99.8 % of THz waves were absorbed in 0.8–1.6 THz. The excellent EMI shielding performance of the architecture was mainly attributed to its outstanding THz EM wave absorption ability. Finally, the mechanical properties and thermal stability of the architecture were further studied. The compressive and flexural strength of honeycomb architecture was 1.2 and 16.5 MPa, respectively. The result also proved that the honeycomb SiOC architecture was resistant to high temperatures up to 1100 °C under inert atmosphere. This work provides promising high-efficiency architecture towards THz EMI shielding and absorption.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 53
·30685-30692
·
IF 3.049
Sifan Zeng,Wanlin Feng,Shuyuan Peng,Zhen Teng,Chen Chen,Haibin Zhang,Shuming Peng
Multi-functional carbon fiber (CF) based composites have great potential as new-type microwave absorption materials (MAMs). However, it was still a huge challenge to integrate antioxidation and MA properties into CF based composites. Herein, the SiOC ceramics coating modified carbon fibers (SiOC/CFs) were prepared by a polymer precursor pyrolysis method. The X-ray photoelectron spectroscopy (XPS) revealed that the SiOC coating was composed of SiOC, SiO2, and amorphous carbon phases. The SiOC ceramics as dual-functional coating not only heightened the oxidation temperature from 415 °C to 890 °C, but also highly improved the microwave absorbing ability from −12.60 dB to −47.50 dB. The enhanced MA performance could be attributed to multiple reflections in the cross-linked structure, various polarization relaxation processes, and the favorable impedance matching effect. The SiOC ceramics coating as a semiconductor could suppress the skin effect originating from the cross-linked CF network, thus leading to a favorable impedance matching behavior.
研究领域:
材料科学
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电磁学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2020
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IF 4.032
Tian Liu,Xingrong Zeng,Xuejun Lai,Hongqiang Li
Novel platinum–thiol catalytic system was constructed by the combination of platinum (Pt) catalysts (Karstedt's catalyst (KC) and chloroplatinic acid hexahydrate (CPA)) and thiol-containing compounds ((3-mercaptopropyl)trimethoxysilane (SM), (3-mercaptopropyl)triethoxysilane (SE), 1,6-hexanedithiol (HDT) and 1-octadecanethiol (OT)). It was found that Pt-thiol catalytic system could remarkably enhance the organic-to-inorganic conversion of polydimethylsiloxane (PDMS) and methylvinylpolysiloxane (Vi-PDMS) at elevated temperature. Under optimal condition, the ceramic yield of KC/SE/Vi-PDMS with 50 ppm Pt (KC) and 0.5 phr SE at 1000 °C was dramatically improved from 0.6 wt% to 54.4 wt% in comparison with Vi-PDMS. FTIR , Raman spectroscopy , XPS and XRD revealed that amorphous free carbon-containing SiOC ceramics were formed after thermal treatment of KC/SE/PDMS and KC/SE/Vi-PDMS at 1000 °C for 60min. And during organic-to-inorganic conversion of Vi-PDMS under high temperature, Pt-thiol catalytic system can efficiently retain C in the inorganic network of SiOC ceramics with existence of vinyl. TG , TG-FTIR and viscosity test results suggested that Pt-thiol system might enhance radicals coupling of Vi-PDMS chains and suppress unzipping decomposition or random scission, which resulted in the high capacity of organic-to-inorganic conversion of KC/SE/Vi-PDMS at elevated temperature.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Pei Feng,Hanjun Wei,Jimei Xue,Yuhua Shi,Peng Shang,Wenyuan Zhang,Sihai Luo,Xiaoqing Liang,Weifeng He
A designed conductive nanoheterogeneous structure can boost interfacial polarisation and effectively enhance the wave absorption properties. Herein, maze-shaped nanoheterogeneous TiB 2 -SiCnws-SiOC ceramics were synthesised via a polymer-derived ceramics (PDCs) approach for constructing a three-dimensional reticular structure. The addition of TiB 2 not only compensates for the lower conductivity, but also facilitates the growth of curved SiCnws. The results show that the addition of 20 wt% TiB 2 leads to favourable microwave absorption performance, with a minimal reflection coefficient of − 55.1 dB at 8.9 GHz and an effective absorption bandwidth of 4.2 GHz. This can be ascribed to the synergistic effect among polarisation loss, conduction loss, and microwave multiple reflection and scattering due to the unique structure. This study may contribute towards establishing multi-loss mechanisms and controllable dielectric properties in PDCs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yalan Miao,Guantong Wang,Hongyu Gong,Mingming Sheng,Jie Jing,Junbin Lu,Maoyun Liu
SiOC ceramics have been considered one of the most promising materials in the field of microwave absorbing materials. When SiOC ceramics are prepared by polymer precursor conversion, chemical modification to improve microwave absorption performance is generally carried out in the precursor preparation and molding process. To meet the requirements of more application scenarios, direct ink writing , one of the 3D printing technologies with more flexible structure and shape design is used to replace the traditional molding methods. In this study, the key problems of the combination of direct ink writing and polymer precursor conversion were solved, and SiOC microwave absorbing ceramics with good structure and shape were obtained. After testing, the minimum reflection loss of the ceramics can reach −36 dB, and the corresponding effective absorption band bandwidth is 2 GHz. The experiments confirmed the possibility of combining 3D printing with polymer precursor conversion and its great potential for preparing microwave absorbing ceramics.
研究领域:
材料科学
·
陶瓷工程
·
增材制造
·
电磁材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Jimei Xue,Xiaoling Liu,Yuqiu Wang,Hepeng Zhao,Xiaomeng Fan
Oxide ceramic matrix composites (OCMC) have good high-temperature resistance, oxidation resistance, and mechanical properties. However, the microwave absorbing properties of OCMC areinsufficient due to the low dielectric and low loss characteristics of oxide ceramics, so it is urgent to develop a kind of the oxide ceramic matrix with adjustable microstructure and electromagnetic properties. PDC-SiOC ceramics are the optimal oxide ceramics whose component and microstructure can be adjusted by rare earth nitrate modified polysiloxane precursor. For Sc(NO 3 ) 3 modified PDC-SiOC ceramics, rare earth metals not only can react with siloxy groups to form silicates at high temperatures but also can catalyze the formation of SiCnws. Herein, rare earth nitrate modified polysiloxane precursor was pyrolyzed at 900°C, and then annealing at high temperature to form silicate and SiCnws. After annealing at 1400°C, a large amount SiCnws was in situ formed conductive network structure in SiOC ceramic, so the SiOC ceramic with SiCnws had great electromagnetic wave (EMW) absorbing properties, the maximum effective absorption bandwidth (EAB max ) and the minimum reflection coefficient (RC min ) at the thickness of 2.75 mm reach 4.0 GHz and −42.3 dB in X -band, respectively. By the double-layer impedance matching design, the EAB can be effectively improved, which provide a good way for the design and fabrication of OCMC with advanced (EMW) absorbing properties.
研究领域:
材料科学
·
微波吸收材料
·
陶瓷基复合材料
·
纳米材料
·
电磁性能
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yi Luo,Liang Li,Zhe Su,Aoqing Yan,Hao Tian,Yu Cao,Bo Niu,Donghui Long
Ceramic aerogels are promising porous materials with high thermal and chemical stability, but their notably low mechanical strength severely restricts their applications. Herein, high-strength SiOC ceramic aerogels (SiOCA S ) were prepared by pyrolyzing thermostable silicone aerogels derived from the polymerization of polysiloxane. The effects of side groups in siloxane and pyrolysis temperature on the structure of SiOCA S were investigated. Methyl side groups induce significant mass loss and volume shrinkage in the aerogels during pyrolysis, attributed to the release of oligomers; in contrast, vinyl and phenyl side groups can promote the high-yield transformation of the SiOC structure and the intact preservation of the 3D aerogel network. At 800 °C, vinyl-functionalized silicones are converted into amorphous SiOC and SiO 4 structures; between 800 and 1400 °C, the SiOC structure decomposes into SiO x and free carbon; and at 1400 °C, it further transforms into β-SiC. The as-prepared SiOCA S exhibit porosities of 65 %–75 %, pore sizes of 56–68 nm, compressive strengths of 25–62 MPa, and excellent electromagnetic wave absorption performance. Furthermore, carbon fiber-reinforced SiOCA S composites exhibit an ultrahigh compressive strength of 155 MPa and a low thermal conductivity of 0.2 W m −1 K −1 at 500 °C, highlighting their significant potential for high-temperature insulation applications.
研究领域:
材料科学
·
陶瓷学
·
高分子化学
·
纳米多孔材料
·
热功能材料
✓ 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）