ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Kai Su,Yang Wang,Kexuan Hu,Xia Fang,Jie Yao,Quan Li,Jian Yang
An ultralight and high-strength SiCnw@SiC foam with highly efficient microwave absorption and heat insulation properties was successfully synthesized using the template sacrifice method and chemical vapor deposition process. The microstructure is a novel double network structure, which is formed by the coupling of the morphology-controlled SiCnw and the SiC skeleton. The introduction of SiCnw can not only provide more interface polarization and dielectric loss to the SiC foam, which greatly enhances the microwave absorption capacity of the composite foam, but also can enable it to act as an excellent radiation absorbent, which can effectively reduce the thermal conductivity of the foam, especially at high temperatures. In this study, a minimum reflection loss (RLmin) of −52.49 dB was achieved at 2.82 mm thickness with an effective absorption bandwidth of 5.6 GHz. As the length/diameter ratio of SiCnw decreases, the composite foam exhibits excellent high-temperature thermal insulation and mechanical properties. For the SiCnw@SiC foam, the thermal conductivity is only 0.304 W/mK at 1200 °C and the compressive strength reaches 1.53 MPa. This multifunctional SiCnw@SiC foam is an outstanding material, which has potential applications in microwave absorption and high-temperature heat insulation in harsh environments.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
ECS Journal of Solid State Science and Technology
·
2024
·Vol. 13
·期 12
·124002
·
IF 1.8
Zifeng Ni,Menghao Xia,Guomei Chen,Jie Yu,Xueyu Lu,Shanhua Qian,Da Bian
In order to meet the requirements of atomic-level smoothness and non-damaging wafer surface with a high material removal rate (MRR) of silicon carbide (SiC), a new method assisted by photoelectron-Fenton reaction was studied to assist in chemical mechanical polishing. The coupling effects of ultraviolet light, electric field, and Fenton reaction in improving the slurry oxidation performance and the oxidation ability on the 4H-SiC wafer surface has been verified by measuring the oxidation-reduction potential, using probe detection methods, and conducting electrochemical experiments. Through immersion oxidation experiments, the oxidation mechanisms of SiC wafers were analyzed in depth using scanning electron microscope, energy-dispersive spectrometry, and X-ray photoelectron spectroscopy tests. The results showed that the photoelectro-Fenton reaction greatly enhanced the oxidation ability of the slurry, which improved the efficiency of oxide layer generation on the wafer surface. The high MRR of 102.4 nm h−1 and the low surface roughness (Ra) of 0.57 nm can be obtained after polishing under the condition of pH = 3, and the polishing and synergistic mechanism of 4H-SiC in the photoelectron-Fenton reaction solution was proposed.
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 ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Naike Shi,Xuyang Yan,Longlong Fan,Meng Xu,Yiming Yang,Mengzhe Hou,Takumi Nishikubo,Masaki Azuma,Jun Chen
Regulating and reducing the thermal expansion of materials has long been a challenge. In this study, a composite with negative thermal expansion (NTE) has been obtained by combining two intrinsically positive thermal expansion (PTE) materials—Ti 2 O 3 and SiC via microstructural effect. We have realized the successful retention and amplification of the microstructural effect of Ti 2 O 3 within the composite. The synchrotron X-ray computed tomography and mercury injection porosimeter reveals that the composite exhibits a unique pore distribution and enhanced porosity, enabling NTE properties that exceed theoretical predictions. This work provides a novel approach to transforming the intrinsic thermal expansion behavior of materials via microstructural effect, paving the way for innovative applications of NTE materials in precision engineering.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Xin Song,Boyu Hu,Jiani Guo,Renke Kang,Shang Gao
Single-oxidant slurries are prevalently utilized in chemical and mechanical polishing (CMP) of 4H-SiC crystal. Nevertheless, it is a challenge to achieve a high material removal rate (MRR) and surface quality using single oxidant slurries to meet the needs of global planarization and damage-free nanoscale surface processing of SiC wafers. To solve this challenge, a novel method is proposed for SiC CMP processing using the double oxidant slurry. This slurry mainly consists of alumina (Al2O3) abrasive particles, potassium permanganate (KMnO4), potassium persulfate (K2S2O8), and deionized water. Post CMP, MRR is 1045 nm/h calculated by scratch method, and surface roughness Sa is 0.33 nm measured by 3D optical surface morphometer, with the measurement area of 868 μm × 868 μm. Both the MRR and Sa are far better than those under the single oxidant slurry condition. CMP mechanism with double-oxidant slurry conditions is elucidated by energy dispersive spectrometer and X-ray photoelectron spectrometer. Initially, the Si–C bond on the SiC wafer surface was oxidized by KMnO4, then MnO2 as the reduction product of KMnO4 can also catalyze the S2O82– to further oxidize SiC wafer surface, and eventually the oxidation layers were removed by mechanical action of nano-Al2O3 abrasive particles during CMP processing. These findings offer a pioneering approach and novel perspectives to achieve a higher MRR of 4H-SiC CMP, with potential implications for the application in high-performance SiC devices.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science China-Technological Sciences
·
2025
·Vol. 68
·期 6
·1-14
·
IF 4.9
Huo Yashan,Qian Yuetong,Zhao Minshan,Zhang Lei,Tan Yujia,He Zhihui,Miao Peng,Zhang Fuchun,Cui Wei,Che Renchao
Efficient, temperature-insensitive electromagnetic attenuation materials are critical for high microwave absorption at high temperatures. This study presents SiC/TiC/SiTiOC hybrid nanofiber mats constructed using an in-situ synthesis method; these mats incorporate SiC/TiC as the microwave loss unit and SiTiOC as the antioxidant unit, offering an innovative approach to high-temperature microwave absorption. The introduction of high-conductivity TiC not only optimizes the dielectric constant and impedance matching of the material but also enhances its thermal cycling stability. This design ensures steady electromagnetic attenuation, enabling the hybrid nanofiber mats to maintain robust absorption performance in the X-band, even at high temperatures. At 873 K, the material demonstrates an effective absorption bandwidth of 3.6 GHz and a minimum reflection loss of −45.55 dB. Compared to single-system absorbers, such as SiC/C nanofiber materials, with a single system, the multi-component SiC/TiC/SiTiOC hybrid nanofiber mats deliver reliable absorption performance in the temperature range of 293–873 K. This study confirms that highly conductive titanium-based ceramic materials used for dielectric property regulation effectively address the challenges of poor temperature stability and limited reusability in high-temperature carbon-ceramic absorbing materials, providing valuable insights and guidance for designing efficient microwave absorbers that can operate across a wide temperature range.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Tongguo Huo,Kai Cao,Jianxin Zheng,Dan Zhu,Yuan Lin,Yu Dai,Jian Wu
The mechanism of β-SiC preparation via chemical vapor deposition (CVD) of the SiCl4–CH4–H2–N2 system remains unclear. Consequently, the change of molar Gibbs free energy of the CVD β-SiC chemical reaction in the SiCl4–CH4–H2–N2 system has been studied by the Helsinki Software Corporation (HSC) Chemistry code for the first time. The role of nitrogen in the reaction was confirmed. Seven potential reaction pathways of CVD β-SiC were presented, and the thermodynamic equilibrium components of each reaction were calculated systematically. The most viable reaction pathway and corresponding optimal temperature range for CVD β-SiC were determined. In addition, a kinetic study of CVD β-SiC was conducted. The microscopic morphology and crystal structure of β-SiC coatings prepared on the graphite surface at different temperatures were charactered by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman, etc. Ultimately, through SEM, XRD, and Raman observation, uniform and dense β-SiC coatings with fine grains and high crystallinity were successfully obtained. Furthermore, large β-SiC-coated graphite trays with diameters of 230 and 465 mm were prepared by CVD using the SiCl4–CH4–H2–N2 system, and the average thickness of β-SiC was about 100.6 μm. This study provides a theoretical basis and technical recommendations for the fabrication of SiC-coated graphite trays used in metal–organic chemical vapor deposition (MOCVD) equipment.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Jinyan Wang,Jintang Zhou,Harm Van Zalinge,Zhengjun Yao,Li Yang
Combining dielectric substrates and magnetic materials is a practical approach to improve electromagnetic wave (EMW) absorption performance due to the dielectric and magnetic synergy loss effect. In this work, uniform monodisperse hollow SiC@Ni (H–SiC@Ni) composites were synthesised through a simple route, including the sacrificial templating method and the subsequent reduction reaction. Different contents of Ni 3 S 2 and Ni could be obtained by adjusting the volume and reaction temperature, which are closely related to the electromagnetic parameters and absorption capabilities. The results show that the H–SiC@Ni-750 composite reaches the optimum EMW absorption performance with the minimum reflection loss of −55.7 dB at 7.3 GHz and the effective absorption bandwidth (EAB) of 8.8 GHz at 2.6 mm. The high absorption performance of the H–SiC@Ni-750 composite benefits from the synergistic dielectric loss and magnetic loss of SiC and Ni nanoparticles. In addition, the hollow and monodisperse core-shell structure of the samples can increase the transmission path through multiple reflections and scattering and further dissipate the EMW energy. This work provides a facile pathway to prepare H–SiC@Ni composite with broadband electromagnetic absorption performance.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Siqi Lan,Zhenguo Huang,Wenyan Huang,Yeqi Zhu,Jiahua Zhan,Shengjian Mao,Zhichao Xue,Rongqian Yao
Demand for SiC-based polymer-derived ceramics (PDCs) employed as hypersonic vehicle components with light weight, high strength, excellent high-temperature/ablation resistance is increasingly urgent. Herein, bulk SiC(Hf, rGO) nanocomposite PDCs were fabricated via re-pyrolyzing ball-milling blends of unique SiC(Hf, rGO) p /polyhafniumcarbosilane-vinyltriethoxysilane-graphene oxide (PHVG). Highly cross-linked PHVG can effectively optimize compact formability and improve ceramic yield. In-situ formed HfO 2 embedded in ceramic network toughens microstructure, while interfacial HfOSi increases structure disorder to improve high-temperature properties. As demonstrated, SiC(Hf, rGO) modified by 3 wt.% Hf and re-pyrolyzed at 1300 °C possess good mechanical performances including hardness (5.83 GPa), fracture toughness (4.29 MPa·m 1/2 ), compressive strength (181.83 MPa) and flexural strength (46.55 MPa). More interestingly, self-healing HfO 2 (HfSiO 4 )/SiO 2 protective layer emerging during 20 min surface ablation test at 1300 °C, timely covers defects and avoids destructive structure, thus retains stable structure and mechanical properties of specimens. Such nanocomposites can promote uses in thermal protection systems (TPS) for hypersonic vehicles against extreme high-temperature environments.
研究领域:
材料科学
·
航空航天工程
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Bocong Zou,Chunmei Chen,Li Sun,Yan Lin,Zhiheng Liu,Weijun Li,Lin Wang,Fengmei Gao,Huan He,Weiyou Yang,Dongdong Zhang,Shanliang Chen
Battery-free photodetection is necessary for underwater optical communication, which poses extremely high requirements in terms of the self-powering capability of photodetectors (PDs) and their ability to operate in harsh liquid environments. Emerging photoelectrochemical (PEC) PDs are appealing owing to their inherent aqueous operation behaviors with highly tunable photoresponses. Herein, a novel self-powered PEC ultraviolet (UV) PD applicable to all-scenario harsh underwater environments, including seawater at different latitudes and solutions with different pH values and temperatures, is demonstrated based on integrated self-supporting SiC/SnO 2 heterojunction nanoarrays. The SiC/SnO 2 heterojunction nanoarrays are achieved by utilizing the anodic oxidation and chemical bath deposition. The SiC/SnO 2 PEC PD demonstrates excellent photodetection performance with rapid rise/decay times ( τ r / τ d , 30/120 ms), high responsivity ( R λ , 1.97 A W −1 ), remarkable detectivity ( D * , 1.98 × 10 11 Jones), and large external quantum efficiency ( EQE , 65.5%) in seawater under 375 nm UV light illumination with zero bias voltage. Moreover, the PEC PD delivers a high photoresponse and excellent aging stability in different latitudes of the world's oceans. The photodetection capability is robust even under harsh conditions, such as strongly acidic and alkaline liquid conditions, and at high temperatures. The developed device is a new type of photodetection device for future all-scenario underwater optical communication.
研究领域:
材料科学
·
光电工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Minghui Zhang,Ming Chang,Weiting Tian,Jingwen Tang,Jiangman Sun,Kai Pan
Titanium Carbide (TiC), characterized by its hardness, conductivity and thermal stability, can serve as a suitable additive phase for SiC nanofibers. TiC phase can improve the flexibility and electromagnetic wave absorption property of SiC nanofibers without sacrificing its high-temperature thermal stability. Herein, flexible SiC/TiC hybrid nanofibers with different Ti contents were fabricated by electrospinning and precursor infiltration pyrolysis. The introduction of Ti can not only generate conductive TiC phase, but also act as a catalyst to regulate the growth of SiC grains, so as to adjust the flexibility and electromagnetic properties of the hybrid nanofibers. At the optimal Ti precursor content of 4 wt%, the SiC/TiC-4 hybrid nanofibers exhibit a broad effective absorption bandwidth of 4.5 GHz with the thickness of 1.6 mm. The flexible SiC/TiC hybrid nanofibers This work can provide a reference for the design of flexible ceramic nanofiber absorbers and is expected to enable practical application in high temperature conditions.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
DOI
高影响因子
Additive Manufacturing
·
2024
·
IF 10.3
Wei Li,Congcong Cui,Shan Li,Ge Zhang,Baojie Jin,Jianxun Bao,Conghui Guo,Yubei Zhang,Bingshan Liu,Gong Wang
Vat photopolymerization technique (VPP) shows advantages in rapidly preparation of complex structure silicon carbide matrix composites (Si/SiC). However, compared with traditional preparation technology, the properties of Si/SiC prepared via VPP are insufficient due to the presence of residual Si and carbon. Herein, the reaction mechanism of Si and carbon were systematically studied. Multiphase carbon was introduced into porous SiC preform via carbon precursor infiltration pyrolysis (CPIP) and graphitization methods. The content of residual Si was significantly decreased after reactive melt infiltration (RMI), and the residual carbon was eliminated through partial graphitization of the carbon. The influence mechanism of the carbon content and crystallinity on the reaction process of Si and carbon was studied. It suggested that the diameter of capillary channel and crystallinity of carbon are the main factors affecting residual carbon content in the final body after RMI. The sample with multiphase carbon achieved the best performance after RMI. The residual Si content, bulk density, flexural strength and elastic modulus are 11.58%, 3.04 g/cm 3 , 280.09 MPa and 355.48 GPa. In addition, the lowest coefficient of linear expansion was 2.39×10 −6 K −1 . Finally, a large-aperture SiC mirror with a diameter of 500 mm was prepared. Therefore, this research lays a foundation for promoting the application of large-aperture Si/SiC prepared via 3D printing .
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xing Liu,He Wen,Jing Wang,Ziwen Dai,Yimeng Shi,Bahar Ozbey-Unal,Cigdem Balcik,Jiakuan Yang,Shushan Yuan
Catalytic ceramic membranes (CCM) featuring catalytic and separating functions, show huge potential in water treatment. Nevertheless, the inability of catalytic ceramic membrane with high catalytic performance to be produced by current fabrication method are the bottleneck preventing their applications. Herein, the high performance CoCuAl@SiC CCM were successfully prepared by coating Al gel interlayer, hydrothermal reaction and annealing in reductive atmosphere. Annealing in reductive atmosphere play key role in enhancing the catalytic property of CoCuAl@SiC CCM. 99.3 % sulfamethoxazole (10 mg·L −1 ) degraded by CoCuAl@SiC CCM annealing at 300 °C and 0.5 mM PMS in 1 min under a wide pH range of 3.5–11.0 and in the presence of anions. Quenching tests confirmed the dominant role of singlet oxygen ( 1 O 2 ) in SMX degradation. The abundant oxygen vacancies and redox cycles of Co 3+ /Co 2+ and Co 2+ /Co 0 on CoCuAl@SiC CCM are crucial for PMS activation. In addition, the SMX degradation pathways were found to comprise deamination, hydroxylation, and ring open according to the degradation intermediates of SMX. This study not only provides an approach for the preparation of catalytic membranes with excellent catalytic activity, but also sheds a novel insight into the indispensable role of oxygen vacancy.
研究领域:
环境科学
·
材料科学
·
水处理技术
✓ 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）