CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mengjia Song,Liwen Yan,Yifan Li,Junpeng Jiang,Zihan Gong,Anran Guo,Haiyan Du,Jiachen Liu
Integration of thermal insulation and electromagnetic wave absorption was crucial in stealth technology and hypersonic vehicles but challenging. Herein, silicon carbide nanofibers were synthesized by in situ chemical vapor deposition within a carbon foam skeleton to form a wave absorbing and heat insulating integrated composite aerogel with a hierarchical porous structure. The unique hierarchical porous structure provided an excellent platform for the absorption of electromagnetic waves, achieving a minimum reflection loss (RL min ) of −51.46 dB at 17.20 GHz. Meanwhile, the C/SiC nanofiber aerogel maintained a low density of 0.013 g/cm 3 , an ultra-low thermal conductivity of 0.030 W/(m⋅K) and a high thermal stability up to 1000 °C. Furthermore, to enhance the electromagnetic wave (EMW) absorption property of the aerogel, polypyrrole (PPy) was coated on the surface of C/SiC nanofiber aerogel by facile impregnation and chemical polymerization. The multiple conductor-semiconductor-conductor structure of C/SiC-PPy composite aerogel leads to various EMW loss mechanisms and excellent impedance match, resulting in an outstanding EMW absorption performance, with a RL min of −60.31 dB at 2.96 GHz.
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高影响因子
ECS Journal of Solid State Science and Technology
·
2024
·Vol. 13
·期 12
·124002
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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.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Zhi-Yuan Zheng,Zhi-Feng Jiao,Ji-Xiao Zhao,Xin-Chao Liu,Cai-Dong Song,Jia-Hang Li,Xiang-Yun Guo
In the hydrogenation of polyfunctional compounds, achieving high selectivity for specific functional groups remains challenging. Herein we report that SiC quantum dots (QDs) can selectively adsorb C = O in cinnamaldehyde, significantly increasing the activity and selectivity of Pt/SiC for hydrogenating cinnamaldehyde to cinnamyl alcohol. A 10 wt% QDs-modified Pt/SiC catalyst showed a turnover frequency 3.5 times higher than Pt/SiC under mild conditions. Further studies reveal that the defect-rich surface of SiC QDs facilitates the adsorption of C = O bond in cinnamaldehyde and enhances the spillover of active hydrogen from Pt to SiC QDs. During the catalysis process, Pt is responsible for the generation of reactive hydrogen species while the QDs undertake the activation of C = O bond, and the hydrogen species react with cinnamaldehyde via spillover. This work demonstrates the promise of SiC QDs in heterogeneous catalysis and provides a reference for designing novel hydrogenation catalysts.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yulong She,Jie Tang,Chaoyang Wang,Zhicheng Wang,Zhengren Huang,Yong Yang
Silicon carbide (SiC) ceramic stands as a critical material in the realm of high-performance engineering ceramics . However, Crafting SiC ceramics with intricate structures and superior mechanical properties presents notable challenges in shaping, sintering, and processing. Binder jetting (BJ) additive manufacturing has the outstanding advantages of high forming efficiency and no thermal deformation , especially suitable for printing complex structure SiC components.; however, BJ printed green bodies often exhibit low density, resulting in high residual silicon content and diminished strength of the final components. In this work, we introduce a novel strategy to fabricate high-strength SiC components with complex geometries by improving the density of printed SiC green bodies. This method involves modifying the morphology of SiC powder through the molten salt method to increase the density of BJ 3D printed green bodies from 1.24 ± 0.13 g/cm³ to 2.01 ± 0.03 g/cm³, followed by a reactive melt infiltration process. The resulting RB-SiC ceramics display exceptional flexural strength , averaging 280.60 ± 33.05 MPa, and an elastic modulus of 294.67 ± 4.90 GPa. These values represent some of the highest for flexural strength and elastic modulus reported among 3D-printed SiC composites. With its robust mechanical performance and streamlined fabrication process, this strategy holds substantial promise for the production of structural SiC ceramics.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xinzhi Liang,Qiaolei Li,Boyang Qu,Yuxiang Qiu,Shengqi Liu,Qing Wang,Jingjing Liang,Haibing Tan,Yanfei Liu,Jinguo Li
High absorbance and high refractive index have always been obstacles to the wide application of silicon carbide ceramics in stereolithography technology. To address the problems of low curing thickness, high viscosity, and poor stability of SiC photosensitive slurry, this study developed a novel resin system with HDDA, TMPTA, DPHA, and PEG200 (volume ratio = 2:6:1:1), incorporating anti-settling agents and plasticizers to enhance the performance of the slurry. The effects of the resin system on the preparation of SiC ceramics by stereolithography were analyzed, focusing on the properties of slurry, forming precision, and mechanical properties of the green body. The optimized slurry exhibited a dynamic viscosity below 3 Pa·s, a sedimentation height (<1% in 24 hours), and a single-layer curing thickness of 85 μm. High-precision and excellent surface quality SiC mirrors were prepared by stereolithography 3D printing and sintered by reactive melt infiltration process (RMI) at 1600 ℃ in Ar 2 . The optimization strategy of SiC slurry proposed in this work provides feasibility for preparing high-precision and high-strength SiC mirrors, which is expected to promote the application of SiC ceramics in the aerospace field.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Cheng Su,Bingzhu Wang,Huan Guo,Jixiang Dai,Jianjun Sha
In view of the high sintering temperature and difficulty in densification of the ultra-high temperature ceramics(UHTCs), a novel reactive hot-pressing process was designed to achieve the low temperature densification of high strength (Zr,Ta)B 2 -SiC ceramics. It was found that the mechanical properties were closely associated with the microstructure, being dependent on the sintering temperature. The microstructure characterization revealed that the main phases of ceramic were incompletely solid soluted borides and SiC at the sintering temperature of 1600 °C; while at 1700 °C, the boride ceramics were completely solid soluted (Zr,Ta)B 2 and formed an interlocking structure with SiC. The evaluation of mechanical properties indicated that the flexural strength of the ceramics increased from 470.2 MPa to 736.7 MPa when the sintering temperature increased from 1600 °C to 1800 °C. Correspondingly, the fracture toughness increased from 3.54 MPa·m 1/2 to 4.10 MPa·m 1/2 . The improvement of mechanical properties were mainly attributed to the interlocking structure formed by the solid solution (Zr,Ta)B 2 and SiC, which caused the crack propagation path becoming tortuous along the interface of different phases.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2025
·
IF 6
Zhirui Xu,Xianxing Ju,Xin Zou,Pengfei Su,Hao Chen,Mingxiang Chen,Qing Wang
The increasing power density of high-performance electronics induces significant thermal stress mismatches among conventional packaging materials, thereby intensifying the demand for tunable, low-stress materials with high thermal conductivity to ensure packaging reliability. Copper-silicon carbide (Cu-SiC) composites have emerged as promising candidates. While composite electrodeposition offers an effective route to mitigate thermal issues inherent to traditional fabrication techniques, challenges persist in achieving uniform SiC dispersion, high incorporation efficiency, and defect-free heterogeneous interfaces at elevated deposition rates. Herein, an improved patterning electrodeposition strategy with cetyltrimethylammonium bromide (CTAB)-assisted ternary-additive electrolyte was proposed for the rapid fabrication of defect-free Cu-SiC composites. Electrochemical analyses revealed CTAB competitively adsorbed with other additives on cathodic active sites, displacing accelerators and cooperating with suppressors to inhibit Cu matrix electrodeposition, refining grains (<1 μm) and promoting dense nucleation. By systematically tuning critical parameters—current density, CTAB concentration, and SiC content—Cu-SiC coating quality was significantly improved. The optimized process yields a uniform Cu-SiC composite coating with a high SiC content (35.9 wt%), dense Cu matrix with (111) preferred orientation, high deposition rate (65.3 μm/h), defect-free heterogeneous interfaces, a low coefficient of thermal expansion (7.2 × 10 −6 /°C), and minimal warpage (0.08 %).
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高影响因子
International Journal of Applied Ceramic Technology
·
2024
·Vol. 21
·期 5
·3302-3310
·
IF 1.8
Rongpei Wang,Gang Wang,Songlin Ran,Wei Wang,Yunlong Yang,Yu Zhao,Kaixuan Gui,Rujie He,Caiwang Tan
AlCoCrFeNi 2.1 eutectic high-entropy alloy was introduced to join C f /SiC composite by spark plasma sintering technique. The influence of holding times on microstructure, shear strength and fracture behavior of the joints was studied. When held for 7 min, the typical microstructure of the C f /SiC-AlCoCrFeNi 2.1 -C f /SiC joint was C f /SiC composite → CrSi 2 + FCC + Al 8 Cr 5 + graphite → CrSi 2 + FCC + Al 8 Cr 5 → CrSi 2 + FCC + Al 8 Cr 5 + graphite → C f /SiC composite. As the holding time extended, the Ni–Si and Fe–Si brittle phases in the joint gradually reduced, and the diffusion transition layer continued to thicken. The maximum joint strength was 23.9 MPa, which was obtained at 1450°C for 7 min. Analyzed by scanning electron microscopy and energy dispersive spectroscopy, the fracture modes of the joints joined at different holding times were all brittle fracture.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·
IF 2.2
Hong Zhen,Xing Yun,Xue Mingshan,Yang Dan,Luo Yidan,Yin Zuozhu,Xie Chan
Owing to their excellent thermal conductivity (TC), boron nitride nanosheet (BNNS)-filled polymer composite films have aroused great interest in their use for heat dissipation in the electronics industry. However, the application of BNNS composite films is limited by their lack of hydrophobicity and non-fouling properties, as well as their low corrosion resistance, affecting their long-term stability in specific environments, such as high humidity environment, rainwater erosion, corrosion from pollutants, and dust pollution. In this work, a composite film with both superhydrophobicity and a high TC was constructed by spraying a silicon carbide (SiC) and polyurethane (PU) coating modified by perfluorooctylmethoxysilane (PFTMS) onto the surface of BNNS-filled polymer composite films. The PFTMS coupling agent not only improved the dispersibility of SiC in PU and the combination of SiC with PU, but also reduced the surface free energy of the film. The optimal mass ratio of SiC to PU for the SiC/PU composite coating was 1.2:1, resulting in superhydrophobic properties with a contact angle (CA) of 168.6 ± 1.3° and a rolling angle (RA) of 2.8 ± 1.2°. Meanwhile, SiC with higher TC also allowed the BNNS-filled composite films to maintain a high TC (32.3 W/m K). The composite films exhibited excellent TC and self-cleaning ability, as well as improved mechanical and chemical stability of the surface, which provides a strategy for enhancing the environmental adaptability of BNNS composite films and broadening their application scenarios. Graphical Abstract Superhydrophobic SiC/PU-coated BNNS composite films with excellent anti-fouling properties and high thermal conductivity
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高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Hezhang Li,Hualu Zhuang,Jincheng Yu,Bowen Cai,Ruiheng Liu,Yi Niu,Jing Jiang,Jing-Feng Li,Chao Wang
Heusler alloys have attracted increasing attention due to their rich functionalities, among which Co2MnSi, a half-metallic full-Heusler, is expected to be a promising n-type thermoelectric material with a superior power factor. However, the intrinsically high thermal conductivity of Heusler alloys due to their metallic nature limits the enhancement in thermoelectric performance. Therefore, it is crucial to reduce the thermal conductivity while maintaining the high power factor, which is a key strategy to fabricate high-performance Co2MnSi alloys. Here, by incorporating a small amount of SiC nanoparticles into the Co2MnSi matrix, the thermoelectric figure of merit is enhanced by approximately 5-fold from 0.03 to 0.15 at 1025 K, due to a significant reduction in thermal conductivity from 22 to 5 W/mK. The electrical transport properties do not suffer any obvious degradation after incorporation of a significant amount of SiC, while the mechanical strength of Co2MnSi-based alloys is further improved. The thermoelectric device fabricated with Co2MnSi as the thermoelectric legs is validated for solid-state refrigeration. It is also expected to promote the development of Co2MnSi-based thermoelectrics with strong magnetism for new applications with multiple functionalities.
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高影响因子
CORROSION SCIENCE
·
2025
·
IF 8.5
Fu-Chen Liu,Bo-Wen Chen,De-Wei Ni,Qian Wang,Fei-Yan Cai,Chun-Jing Liao,Hong-Da Wang,Yu-Sheng Ding,Shao-Ming Dong
In this work, YB 4 -CrSi 2 surface-modified C f /ZrB 2 -SiC composites were fabricated by a slurry coating method. The cyclic ablation resistance of the composites was studied at 2600 °C for 300 s using an air plasma test. The ablation mechanisms of the composites were discussed. The Y 3+ can prevent the phase transition of the ZrO 2 and increase the structural stability of the oxide layer. But the oxide layer cannot prevent the inward O penetration resulting from the forming of Zr 0.9 Y 0.1 O 1.95 grains with abundant oxygen vacancy. After the modification of CrSi 2 , the size of Zr 0.9 Y 0.1 O 1.95 grains can be reduced to nano scale. The adequate SiO 2 glassy phase with the uniform distribution of the Zr 0.9 Y 0.1 O 1.95 nano grains can prevent the O penetration effectively and reduce the mass recession rate of the composites.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhiyuan Wang,Ce Zheng,Hongru Jin,Yichun Bi,Shengkai Wang,Xiaoqiang Li
This study investigates the densification, mechanical properties, and irradiation response of NITE-SiC fabricated using two low-content quaternary sintering additive systems: AlN-Y 2 O 3 -CeO 2 -MgO (AN-SiC) and Al 2 O 3 -Y 2 O 3 -CeO 2 -MgO (AO-SiC). The incorporation of nitrogen significantly enhances densification by increasing liquid phase viscosity, thereby suppressing additive evaporation and enabling >99.5 % relative density. Multi-cation doping (Y, Ce, Mg, Al) into the Y 2 Si 2 O 7 intergranular phase reduces eutectic temperature and promotes homogeneous sintering. Under irradiation to 7–8 dpa at 550–750 °C, both systems exhibit exceptional stability, attributed to the highly ionic Y 2 Si 2 O 7 structure resisting amorphization and accommodating dopants without segregation. Damage remains dominated by intragranular defect evolution in SiC grains, while AN-SiC demonstrates reduced radiation hardening and enhanced modulus recovery, highlighting the synergistic role of nitrogen in improving sintering and radiation resistance for Gen-IV reactor applications.
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高影响因子
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