CARBON
·
2022
·
IF 11.307
Shixiang Zhou,Li Yao,Tong Zhao,Hui Mei,Laifei Cheng,Litong Zhang
Ti-doped polymer-derived SiOC ceramic has multi-functional sensing capability due to its semiconductive properties. Their mechanical and chemical stability provide reliable support for their long-term service and safe operation in extreme environments. The sensing properties of Ti-doped SiOC (SiTiOC) can be optimized by modulation carrier concentration. Meanwhile, it can be fabricated by 3D printing as structural-strengthened components, promising for abnormal environmental signals warning under harsh conditions. In this work, SiTiOC gyroid structures were constructed by vat photopolymerization. The resulting components had thermistor characteristics with a negative temperature coefficient . After the Ti doping, the structures exhibited a high conductivity of 1.10 S/m, as the Ti ions formed an efficient percolation network by introducing acceptor impurities. The structures also had piezoresistive capability as the conductive phases can generate a tunneling-percolation conduction effect. They can detect a strain of less than 0.5%. Furthermore, the structures can realize n-butanol sensing for their p-type semiconductor properties . The components also had an excellent mechanical performance with the compressive strength and Young's modulus of 92.83 MPa and 4.28 GPa, respectively, ensuring reliable service under pressure loading.
研究领域:
材料科学
·
传感技术
·
增材制造
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lu Tang,Siyu Chen,Donghong Wang,Zhiyong Chen,Jimei Xue,Zhijun Wang,Ying Li,Hanjun Wei
The inherent dielectric properties and thermal stability of transition metal carbides (TMCs) have generated significant interest because of their potential use in electromagnetic (EM) wave applications at various temperatures. However, the high relative complex permittivity and conductivity of TMCs can cause impedance mismatch issues when utilized as absorbers, thereby limiting their effectiveness in absorbing EM waves. To solve these problems, ZrC/ZrO 2 –SiOC composites with a porous lamellar structure were prepared using polymer-derived ceramics (PDC) technology, which involved dispersing zirconium carbide (ZrC) into modified polysiloxane (PSO). The resulting ZrC/ZrO 2 –SiOC composite (with 5 wt% ZrC content sintered at 900 °C) achieved remarkable EM wave absorption performance , with a minimum reflection loss (RL min ) of −33.52 dB at 13.0 GHz and an effective absorption bandwidth (EAB) extending up to 7.75 GHz. This exceptional absorption of EM waves is due to the synergistic interplay of various factors such as interface polarization, dipole polarization, and conduction loss . Moreover, the composites exhibit a minimal weight loss of less than 2 % when exposed to air at temperatures ranging from 25 to 1200 °C. This study not only broadens the application possibilities of TMC materials in microwave absorption but also highlights their potential for further improvement and deployment in high-temperature environments.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Fan Yang,Yongpeng Dong,Yuqiu Wang,Jimei Xue,Shangwu Fan,Xiaomeng Fan,Laifei Cheng
For electromagnetic wave absorbing ceramic matrix composites, it is crucial to control the loss mechanism to achieve stable high-temperature broadband absorption performance. In this work, multiscale structural design is utilized to enrich EMW loss mechanism, synergistically improving the EMW absorption capacity and bandwidth. Firstly, based on the tunability of the fiber preform, three-dimensional carbon fiber periodic units were constructed on an N610 fiber cloth. Then, the intrinsic electromagnetic properties of the N610 fibers were modified by introducing nanoscale absorption units, namely carbon nanowires. The carbon nanowires were diffusely distributed in transparent N610/SiOC composites by controlling the reaction conditions, forming a large number of heterogeneous interfaces and conductive networks. The carbon fiber and carbon nanowires, together with the notable conductivity difference with respect to the N610/SiOC composites, significantly enhance the polarization loss and conductive loss. Besides, the periodically arranged carbon fibers can trap the incident EMWs and reduce their transmission, promoting reflection, scattering, and absorption. The designed N610/SiOC composites exhibit superior EMW absorption performance from room temperature to 600 ℃, with a reflection loss less than −8 dB across the entire investigated band and an effective absorption bandwidth exceeding 10.7 GHz at 4–18 GHz. This innovative multiscale design approach, characterized by a discrete distribution of absorbing units with a high electronegativity difference, represents a fresh avenue for advancing the development of high-temperature and wide-band EMW-absorbing CMCs.
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
·
2023
·
IF 5.2
Junjie Yan,Xiumei Wu,Qidong Liu,Yunping Li,Shu Yu
Silicon oxycarbide (SiOC) coatings were prepared through isothermal chemical vapor co-deposition by using two precursors of hexamethyldisilane (HMDS) and tetraethyl orthosilicate (TEOS). The microstructure, composition and the protectiveness on C/C composite against oxidation of the coatings prepared at temperatures ranging from 1423 K to 1563 K and pressures ranging from 500 Pa to 1200 Pa were investigated, respectively. After oxidation, cracks and defects were formed in the coatings of all conditions due to the volume shrinkage of amorphous SiO 2 crystallization and the mismatch of thermal expansion coefficient (CTE) between SiOC coatings and substrate. The most oxidation-resistant SiOC coating was obtained at 1563 K and 500 Pa, which exhibited the lowest weight loss rate of 4.87 % after 12 h of oxidation at 1673 K in air condition.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2019
·
IF 5.77
Haixia Yang,Chunming Li,Xiandong Yue,Jianchun Huo,Feng Ye,Jingxiao Liu,Fei Shi,Jie Ma
Although pure silicon oxycarbide (SiOC) aerogels have unique properties of low density and high temperature resistance, they are still difficult to apply at a large scale due to brittleness. To overcome this drawback, a strong boron nitride/silicon oxycarbide (BN/SiOC) aerogel composite with high-temperature resistance and thermal insulation was prepared by the sol-gel method and pyrolysis of the precursor aerogel. The microstructural, mechanical and thermal insulation properties of the composites were investigated, and the effect of the BN content on the microstructure and properties was also clarified. The results indicate that the obtained mesoporous composites exhibit low thermal conductivity (0.04–0.20 Wm −1 K −1 ) and high-temperature resistance (∼1300 °C). As the BN content increased from 0 to 15 vol %, the compressive strength of the composites increased from 2.2 to 20.3 MPa. The obtained composites exhibit considerable promise in high-temperature thermal insulation applications.
研究领域:
材料科学
·
高温材料
·
纳米材料
✓ 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
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Ruyue Su,Pingan Liu,Jingyi Chen,Wenqing Wang,Xiaotong Chen,Rujie He,Ying Li
The great application potential of terahertz (THz) waves in communication, imaging, and other cutting-edge fields makes them vulnerable to harsh environments. THz electromagnetic interference (EMI) shielding materials that are applicable in capable of with standing harsh environments are critically important for ensuring the reliable operation of electronic devices and are urgently needed. Herein, UV light-cured SiC whisker (SiC w )@MXene/SiOC composites with different SiC w :MXene mass ratios are developed through electrostatic self-assembly. The influence of MXene exfoliation routes and SiC w :MXene mass ratios on the THz EMI shielding performance of SiC w @MXene/SiOC are investigated in deep. The results indicated that SiC w @HF-MXene/SiOC with the SiC w :MXene mass ratio of 1:1 exhibited the best THz EMI shielding performance, and the abundant heterointerfaces formed between SiC w and MXene enhanced THz wave attenuation. Subsequently, SiC w @MXene/SiOC Gyroid triple periodic minimal surface (TPMS) metastructures are fabricated by vat photopolymerization (VPP) 3D printing. All of the obtained metastructures with a thickness of 1.3–2.7 mm exhibited superior THz EMI shielding properties with an average shielding efficiency (SE) of 58.6–66.4 dB in 0.2–1.6 THz. Moreover, the developed Gyroid-2.5 metastructure even exhibited low thermal conductivity and electron-to-thermal conversion properties. The developed Gyroid metastructure facilitates the development of next-generation THz EMI shielding materials in harsh environments.
研究领域:
材料科学
·
电磁学
·
先进制造
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2024
·Vol. 30
·期 3
·238-249
·
IF 6.7
Ji Jiankun,Gu Yarong,Zhang Jianning,Yu Chongwen,Hu Xiao,Bao Yueping,Song Yujie
A major challenge is to construct ceramic membranes with tunable structures and functions for water treatment. Herein, a novel corrosion-resistant polymer-derived silicon oxycarbide (SiOC) ceramic membrane with designed architectures was fabricated by a phase separation method and was applied in organic removal via adsorption and oxidation for the first time. The pore structure of the as-prepared SiOC ceramic membranes was well controlled by changing the sintering temperature and polydimethylsiloxane content, leading to a pore size of 0.84–1.62 μm and porosity of 25.0–43.8%. Corrosion resistance test results showed that the SiOC membranes sustained minimal damage during 24 h exposure to high-intensity acid–base conditions, which could be attributed to the chemical inertness of SiOC. With rhodamine 6G (R6G) as the model pollutant, the SiOC membrane demonstrated an initial effective removal rate of 99% via adsorption; however, the removal rate decreased as the system approached adsorption saturation. When peroxymonosulfate was added into the system, efficient and continuous degradation of R6G was observed throughout the entire period, indicating the potential of the as-prepared SiOC membrane in oxidation-related processes. Thus, this work provides new insights into the construction of novel polymer-derived ceramic membranes with well-defined structures and functions.
研究领域:
材料科学
·
环境工程
·
水处理技术
✓ 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
Defence Technology
·
2025
·
IF 5.9
Hanjun Wei,Siyu Chen,Zhiyong Chen,Lu Tang,Jimei Xue,Cunxian Wang,Zhijun Wang,Ying Li
Designing materials with both structural load-bearing capacity and broadband electromagnetic (EM) wave absorption properties remains a significant challenge. In this work, SiOC/SiC/SiO 2 composite with gyroid structures were prepared through digital light processing (DLP) 3D printing, polymer-derived ceramics (PDCs), chemical vapor infiltration (CVI) and oxidation technologies. The incorporation of the CVI SiC phase effectively increases the dissipation capability, while the synergistic interaction between the gyroid structure and SiO 2 phase significantly improves impedance matching performance. The SiOC/SiC/SiO 2 composite achieved a minimum reflection loss (RL min ) of −62.2 dB at 4.3 mm, and the effective absorption bandwidth (EAB) covered the X-band, with a thickness range of 4.1 mm to 4.65 mm. The CST simulation results explain the broadband and low-frequency absorption characteristics, with an EAB of 8.4 GHz (9.6–18 GHz) and an RL min of −21 dB at 5 GHz. The excellent EM wave attenuation performance is associated primarily with polarization loss, conduction loss, the gyroid structure's enhancement of multiple reflections and scattering of EM waves, and the resonance effect between the structural units. The SiOC/SiC/SiO 2 composite also demonstrated strong mechanical properties, with a maximum compressive failure strength of 31.6 MPa in the height direction. This work opens novel prospects for the development of multifunctional structural wave-absorbing materials suitable for broadband microwave absorption and load-bearing properties.
研究领域:
材料科学
·
电磁学
·
微波工程
·
3D打印
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Quanhui Wu,Pengfei Wu,Huibin Tu,Sen Mi,Zhenpu Zhang,Keyan Song,Anhua Liu
Polymer-derived silicon oxycarbide (SiOC) ceramics are promising anode materials for lithium-ion batteries due to their high theoretical capacity. However, controlling their structure and composition during pyrolysis is challenging. This study employs chemical methods to construct hyperbranched polysiloxane precursors, exposing varying amounts of Si–OH groups to regulate Si–C and Si–O rearrangement. The resulting SiOC ceramics exhibit high reversible phase contents and improved electrical conductivity with added phenolic resin. The optimized SiOC ceramic M1-PF delivers a reversible capacity of 775.5 mAh g −1 after 300 cycles at 0.5 A g −1 , and 344 mAh g −1 at 4 A g −1 . A full cell with M1-PF and LiFePO 4 retains 89.7 % capacity after 100 cycles at 0.2 A g −1 . This work provides new insights for customizing SiOC ceramics for advanced battery applications.
研究领域:
材料科学
·
电化学
·
储能技术
·
高分子化学
·
陶瓷材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Hongxia Liu,Minggang Zhang,Zhipeng Jin,Hui Mei,Gangqiang Zhu,Longkai Pan,Laifei Cheng,Litong Zhang
Photocatalysis is recognized as one of the most promising techniques for environment purification. However, the inconvenient recovery of powder photocatalysts significantly impeded their practical applications. Immobilization of the photocatalysts on supports to form monolithic photocatalysts is an effective method to solve this problem. Herein, a monolithic photocatalyst Bi 12 TiO 20 /Bi 4 Ti 3 O 12 /SiOC is fabricated by growing optimal Bi 12 TiO 20 /Bi 4 Ti 3 O 12 S-scheme heterojunction onto 3D-printed porous SiOC support. On one side, S-scheme heterojunction facilitates the separation of photoinduced electrons and holes while retaining their strong redox ability. On the other side, the porous structure favors mass transport and improves light harvesting by reflecting the light several times. Under simulated solar light irradiation, the NO removal efficiency of the monolithic photocatalyst Bi 12 TiO 20 /Bi 4 Ti 3 O 12 /SiOC is 16.4 %. Furthermore, the composite has good stability and reusability, suggesting its great potential in practical application. The possible photocatalytic mechanism is proposed according to systematic experiments and density functional theory (DFT). This work provides a rational reference for constructing efficient photocatalysts for environmental purification.
研究领域:
环境科学
·
材料科学
✓ 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）