JOURNAL OF NUCLEAR MATERIALS
·
2026
·
IF 3.3
Dexuan Yan,Changsheng Deng,Rui Xu,Feng Qiao,Shaochang Hao,Jianjun Li,Xingyu Zhao,Bing Liu
High density SiC-UN composite pellets were prepared by Spark Plasma Sintering (SPS). Al powders were confirmed as a better sintering aid than Al 2 O 3 +Y 2 O 3 and the density of the composite pellets reached 98.33% of theoretical density (TD). When the SiC content increased above 4.76 wt%, the SiC formed continuous phase in composite pellets and surrounded UN particles. The continuous SiC phase improved the pellets’ thermal conductivity but reduced the oxidation resistance. However, the SiC with low content (<4.76 wt%) and dispersed distribution improved the oxidation resistance owing to formation of dense U-Si-N-O-(C) layer during the oxidation. The oxidation onset temperature (OOT) of 2.46wt%SiC-UN pellets was improved to about 450 °C compared with the 409 °C OOT of UN pellets.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Chenxi GAO,Jian CHEN,Changcong HUANG,Shengjun LIAO,Lan PENG,Zhengren HUANG
In this study, high-strength dense silicon carbide ceramics were successfully prepared via material extrusion 3D printing in combination with pressureless solid-state sintering, in which a polyethylene/wax synergistic binder system was applied to material extrusion 3D printing. Samples of different binder components were prepared by adjusting the ratios of high-density polyethylene (HDPE), low-density polyethylene (LDPE), and paraffin wax (PW). Owing to the good synergy between HDPE/LDPE and PW, a uniform polymer skeleton network was formed in the HL21P sample, demonstrating the best rheological properties and printing quality. After sintering, the HL21P sample possessed the highest density of 3.06 g/cm 3 and the lowest open porosity of 0.4%, along with an optimal flexural strength of 397±29 MPa and elastic modulus of 345±29 GPa. Additionally, the optimal composition HL21P sample still possesses a flexural strength of 382 MPa after sintering at 1700°C. This research addresses the high-temperature failure of SiC ceramics fabricated via the prevalent reaction sintering method in the field of 3D-printed SiC ceramics, attributed to the presence of free silicon. It also demonstrates the importance of polyethylene and paraffin synergy in forming a polymeric skeletal network, enabling the production of SiC ceramics through 3D printing and pressureless sintering.
研究领域:
材料科学
·
先进制造
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Cong Zhou,Zhengya Wei,Feihu Yun,Le Yang,Tianxing Liu,Guilong Chen,Xia Fang,Shuang Yin,Ruzhong Zuo
Lightweight yet strongly attenuating microwave absorbers remain in urgent demand. In this article, polymer-derived C f /C/SiC ceramic aerogel composites (CACs) with hierarchical porous structure have been prepared via a sol-gel route followed by freeze-drying. The C f /C/SiC CACs were composed of polyacrylonitrile fibers/hydroxyethyl cellulose (PAN/HEC) derived carbon framework and polycarbosilane derived SiC aerogel. The incorporation of PAN/HEC was used to tailor the conductivity and impedance matching characteristics of CACs, and the permittivity of C f /C/SiC CACs could be adjusted by changing the quantity of PAN fibers introduced or by altering the pyrolysis temperature. After pyrolysis at 900 °C, a ceramic yield of ∼38 % was obtained, together with a BET surface area of 95.63 m 2 /g. Moreover, the C f /C/SiC exhibited an outstanding reflection loss ( RL min ) of −75.19 dB at 12.82 GHz ( d = 2.52 mm), whereas its effective absorption bandwidth (EAB) was further broadened to 5.9 GHz at 2.24 mm. The superior microwave absorption (MA) performance of C f /C/SiC CACs stems from: (i) hierarchical porous structure that multiply internal reflections, (ii) PAN/HEC-derived carbon framework that optimize the impedance matching, and (iii) synergistic effect of conductivity loss and interfacial polarization loss. The optimal preparation temperature is 700 °C, lower than that of comparable ceramic-based absorbers. Therefore, this research provides a low-cost and convenient method to fabricate MA materials with lightweight and high-performance.
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DOI
高影响因子
Advances in Applied Ceramics
·
2019
·
IF 1.429
Zhaofu Zhang,Jianjun Sha,Jixiang Dai,Yufei Zu,Zhaozhao Lv
To improve the fracture properties of ZrB2-based composites, SiC nanowires (SiCnw) were introduced into the powder mixtures via an in-situ growth method and the composites were fabricated by hot pressing. Microstructure observations found that the SiCnw with a diameter of less than 100 nm presented twisted morphology and homogeneously distributed among ceramic particles. It was also found that the SiCnw could inhibit the grain growth of ZrB2-based composites. Compared to that of composites without SiCnw, the fracture toughness and the work of fracture for the composites with SiCnw were 7.17 MPa m1/2 and 205 J m−2, which increased by 61.1% and 91.6%, respectively. The main enhancing mechanisms could be associated with the obvious crack deflection, crack branching and pull out of SiCnw. The SiCnw could refrain the crack opening and reduce the stress intensity in front of crack tips, which absorbed more energy and improved the fracture properties.
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DOI
高影响因子
Advances in Materials Science and Engineering
·
2015
·Vol. 2015
·期 1
·465358
·
IF 0.744
Lei Wang,Feng Hou,Xin Wang,Jiachen Liu,Anran Guo
Continuous carbon nanotube (CNT) networks were formed in C f /SiC composites via freeze-drying method. Composites were fabricated by precursor infiltration and pyrolysis (PIP) process afterwards. The different distribution morphologies of CNTs in the preforms originating from the different CNT contents were analyzed while the influence of the distribution of CNTs was discussed in detail. Compared to composites without CNTs, the interfacial shear strength (ILSS) and the flexural strength of C f /1%CNTs/SiC were increased by 31% and 27%, respectively, but the values of C f /2.5%CNTs/SiC decreased as a result of lots of defects caused by excess CNTs. With the analysis of ILSS, the flexural strengths, and the fracture morphologies, CNTs effectively improved the weak interfacial strength between T700SC carbon fibers and SiC matrix.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 44
·期 4
·3596-3605
·
IF 2.986
Zhongren Zhou,Yingjie Zhang,Peng Dong,Yixin Hua,Qibo Zhang,Ding Wang,Jianguo Duan,Zhen Zhang
The molten salt electrolytic method for the preparation of titanium carbide and silicon carbide composites has been subjected to a systematic investigation by experimental analyses and thermodynamic calculations . It has been confirmed that the electrolysis of high titanium slag in the presence of mixed graphite powders generates intermediates CaTiO 3 , Ti 2 O 3 , TiO, Fe 3 Si and objective carbonous products TiC/SiC. It has been furthermore found that the deoxidization process depends critically on a number of process parameters, namely, electrolyte composition, graphitic regime, reaction temperature, cell voltage and reaction time. After careful optimization of these parameters, TiC/SiC nanocomposites with particle sizes of 10–174 nm has been produced by electrolysis of high titanium slag and graphite mixtures in molar ratio of 1:2 referred to Ti:C under 3.2 V at 900 °C for 6 h in 1 mol%CaO-CaCl 2 -NaCl molten salt and with particle sizes of 12 nm~207 nm in 1 mol%CaO-CaCl 2 electrolyte.
研究领域:
材料科学
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电化学
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陶瓷与复合材料
·
无机合成
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 11
·19281-19289
·
IF 5.2
Jianwei Sun,Qiang Jing,Liwen Lei,Jinyong Zhang
Residual stress greatly affects the mechanic performance of the functionally graded materials (FGM). The residual stress distributions in different Si 3 N 4 /SiC FGMs formed in the fabricating processes were investigated with X-ray diffraction method in this work. It's found that residual stresses in FGMs with different component gradients were the gradient function of the quadratic of the component content and mainly determined by gradual changes of thermal mismatch and elastic modulus caused by the component content gradient. And the maximum tensile strength of FGM was limited by the ultimate tensile strength or shearing strength of SiC . When the maximum tensile strength exceeded the ultimate tensile strength or shearing strength of SiC and the maximum residual stress was maintained within the ultimate limit and resulted in the newly balanced stress distribution due to the same gradient function, cracks were formed. These results obviously provide ideas for regulating the performance and designing the FGM gradient for some special applications.
研究领域:
材料科学
·
陶瓷
·
机械工程
·
复合材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 17
·29142-29152
·
IF 5.1
Xu Shen,Yu Zhang,Qin Ma,Shuang Mu,Shaoming Dong,Jinshan Yang
The oxidation property of liquid-phase sintered silicon carbide (LPS-SiC) ceramics with ZrB 2 addition was studied after oxidation test in air at 1400 °C. The results indicate that the addition of ZrB 2 decreased the degree of polymerization (DOP) of the silicate networks in the oxide layer, suppressing the additional oxidation caused by residual bubbles in the oxide layer of LPS-SiC, which bypassed the layer and directly corroded the material internally. After 100 h of oxidation, the additional oxidation depth was found to be 125 μm in the sample without ZrB 2 and 0 μm in those containing 10 wt% ZrB 2 . Simultaneously, the decrease in DOP facilitates the migration of crystalline phases. The generated ZrSiO 4 can migrate and aggregate at the interface between the surface oxide layer and the SiC/ZrB 2 matrix, forming a continuous ZrSiO 4 barrier. This impedes the diffusion of the oxidant and enhances the oxidation resistance . However, an insufficient ZrB 2 content leads to a discontinuous ZrSiO 4 layer, thereby weakening its protective effect. Simultaneously, a decrease in DOP increases the rate of oxygen diffusion, resulting in an increase in the oxidation layer thickness. This study contributes to a better understanding of the failure mechanisms of LPS-SiC in oxidizing environments and provide a reference for the design of oxidation-resistant LPS-SiC materials.
研究领域:
材料科学
·
陶瓷
·
高温材料
·
氧化行为
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Chen Ma,Jinshuo Duan,Furong Liang,Jiawei Liu,Haowen Deng,Wanxin Zhi,Fan Xiao,Wanjing Zhang,Baojie Zhang
Multifunctional materials offering high-temperature thermal insulation and electromagnetic wave (EMW) absorption have become a research focus in recent years. Mullite offers excellent thermal insulation; however, it exhibits high infrared transmittance and lacks EMW absorption capability. Silicon carbide (SiC) exhibits infrared-shielding and EMW absorption capabilities but suffers from insufficient stability under long-term high-temperature oxidative exposure. Here, this research designed and fabricated a composite structure by embedding hollow SiC spheres (HSSs) into mullite fibers, aiming to synergistically combine the advantages of both materials. Compared to pure mullite nanofibers, the composite with an HSS content of 30% exhibited 24.4% and 29.3% lower thermal conductivity values at 25 °C and 1000 °C, respectively. The infrared transmittance in the 2.5–8 μm wavelength range decreased from 90% to 32%. Furthermore, at a thickness of 2.0 mm, the composite achieved a minimum reflection loss of −45.37 dB and an effective absorption bandwidth of 4.32 GHz. These improvements originate from synergistic mechanisms enabled by the HSSs. The intrinsic infrared shielding and dielectric loss properties of SiC provide a fundamental performance baseline. Meanwhile, the hollow structure not only hinders solid-phase heat conduction but also enhances infrared attenuation via multiple reflection, scattering, and absorption. Moreover, the introduced heterogeneous interfaces promote interfacial polarization and multiple relaxation processes, which optimize impedance matching and loss capacity, leading to significantly enhanced EMW absorption performance. Overall, this research offers a new approach for designing materials with thermal protection and electromagnetic stealth performance.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Zhanglong Guo,Yuefeng Liu,Yan Liu,Wei Chu
In this study, SiC supported Pd nanoparticles were found to be an efficient catalyst in acetylene selective hydrogenation reaction. The ethylene selectivity can be about 20% higher than that on Pd/TiO 2 catalyst at the same acetylene conversion at 90%. Moreover, Pd/SiC catalyst showed a stable catalytic life at 65 °C with 80% ethylene selectivity. With the detailed characterization using temperature-programmed reduction (H 2 -TPR), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N 2 adsorption/desorption analysis, CO-chemisorption and thermo-gravimetric analysis (TGA), it was found that SiC owns a lower surface area (22.9 m 2 /g) and a broad distribution of meso-/macro-porosity (from 5 to 65 nm), which enhanced the mass transfer during the chemical process at high reaction rate and decreased the residence time of ethylene on catalyst surface. Importantly, SiC support has the high thermal conductivity, which favored the rapid temperature homogenization through the catalyst bed and inhabited the over-hydrogenation of acetylene. The surface electronic density of Pd on Pd/SiC catalyst was higher than that on Pd/TiO 2 , which could promote desorption of ethylene from surface of the catalyst. TGA results confirmed a much less coke deposition on Pd/SiC catalyst.
研究领域:
催化化学
·
材料科学
·
化学工程
·
纳米技术
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DOI
高影响因子
ADVANCED MATERIALS
·
2026
·
IF 29.1
Xiaotong Chen,Wenqing Wang,Jingyi Chen,Xiong Gao,Junzhe Xin,Chang Liu,Rujie He,Ying Li
High-temperature thermal insulation properties of ultralight SiC materials make them highly promising for extreme environment applications. In this study, inspired by ancient paper-making, we demonstrate the room-temperature assembly of pre-formed SiC fibers into an ultralight ceramic “paper” using an aqueous CTAB-stabilized slurry. Under the baptism of 1600°C the “paper” does not burn and strengthens itself. Aerodynamic heat triggers surface oxidation, welding fiber crossings into stable junctions and boosting compressive strength from 49 to 206 kPa, while the skeleton retains its shape with only 1.23% mass loss. The resultant ultralight SiC fiber mat (SFM) carries an ultralow thermal conductivity of 42 mW m −1 K −1 and a density of 0.13 g cm −3 , yet survives 80% compression, 135° bending and 45° twisting without fracture. Repeated flame impingement, cyclic airflow scouring and ten-cycle ablation leave the back-face temperature below 400°C, evidencing reliable reusability. Because the “ceramic papermaking” route relies solely on gravity sedimentation and pH-triggered structural assembly, meter-scale or intricately patterned parts can be molded in hours, then dried at 80°C, avoiding complex sol-gel chemistry or high-temperature carbothermal synthesis. The same Seebeck-principle network further endows SFM with real-time temperature measurement (±10°C accuracy), integrating insulation and damage tolerance in one fire-strengthened sheet.
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DOI
PubMed
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2020
·
IF 4.652
Jianlong Chai,Yabin Zhu,Zhiguang Wang,Tielong Shen,Yiwen Liu,Lijuan Niu,Shufen Li,Cunfeng Yao,Minghuan Cui,Chao Liu
Al 2 O 3 –ZrO 2 (3Y)–SiC ceramic composites were prepared by spark plasma sintering in vacuum under 40 MPa of uniaxial compression between 1300 °C and 1400 °C. The effect of nano-size SiC and sintering temperature on the microstructure and mechanical properties of ceramic composites were investigated. The results showed that SiC particles was uniformly distributed in the composite, mainly within the matrix grains. Sintering temperature and SiC particles caused the shape of alumina grains to be columnar. The flexural strength of 22.3 vol% Al 2 O 3 -57.7 vol% ZrO 2 -20 vol% SiC sintered at 1350 °C composites was 1081 MPa, fracture toughness was 15.18 MPa m 1/2 and hardness was 16.42 GPa. The addition of SiC particles leads to grain boundary strengthening, and the change of fracture mode and cracks deflection and bridging are considered to be the main reasons for the increase in material fracture toughness.
研究领域:
材料科学
·
陶瓷学
·
复合材料
·
固态物理
·
结构材料
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DOI
高影响因子
危险品化学品经营许可证（带存储）