JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2016
·
IF 2.933
Xiaowu Chen,Shaoming Dong,Yanmei Kan,Haijun Zhou,Jianbao Hu,Dengke Wang
Three-dimensional (3D) C f /SiC-ZrC-ZrB 2 composites were successfully fabricated by sol-gel process combined with reactive melt infiltration (RMI) method. With H 3 BO 3 and PVA as raw materials for gel precursor, a porous C-B 4 C matrix was first introduced into the 3D carbon fiber preform by impregnation of the gel precursor, followed by heat-treatments of pyrolysis and carbothermal processes at 1500 °C in Ar atmosphere . Then molten ZrSi 2 alloys were infiltrated into the 3D C f /C-B 4 C preform to obtain 3D C f /SiC-ZrC-ZrB 2 composites. Based on thermodynamic analysis , the formation mechanism of SiC-ZrC-ZrB 2 matrix was revealed. Oxidation resistance and ablation resistance properties of the fabricated 3D C f /SiC-ZrC-ZrB 2 composites were tested using a muffle furnace and a plasma wind tunnel equipment, respectively. The flexural strength of the as prepared composites and its strength retention after oxidation were evaluated. It is revealed that the 3D C f /SiC-ZrC-ZrB 2 composites showed superior flexural strength , good oxidation resistance and excellent anti-ablation properties.
研究领域:
材料科学
·
陶瓷基复合材料
·
高温材料
·
航空航天工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2014
·
IF 2.307
Yinsheng Li,Jie Yin,Haibo Wu,Hao Deng,Jian Chen,Yongjie Yan,Xuejian Liu,Zhengren Huang,Dongliang Jiang
In order to fabricate SiC–BN composites with enhanced electrical resistivity, boric acid and urea were used as reactants for synthesizing nano-sized BN particles on the surfaces of SiC powders in flowing ammonia atmosphere. The composites containing 10 wt% BN were pressureless densified at 2150 °C for 1 h with B 4 C and C as sintering additives. The chemical route was advantageous for obtaining finer BN dispersoids and microstructures of higher homogeneity, which significantly enlarged the SiC/BN interdiffusion area. Consequently, the concentrations of dissolved B and N in SiC grains became more equivalent and the carrier concentration was further decreased through impurity compensation mechanism. The chemically processed composite exhibited a considerably high electrical resistivity (1.03 × 10 12 Ω cm), which was ∼15 times higher than that of the composite prepared by conventional powder mixing method. Besides, considerably low dielectric constant (13.88) and loss tangent (0.128) at 1 MHz, as well as good thermal conductivity (70.08 W m −1 K −1 ) were also achieved.
研究领域:
材料科学
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陶瓷与复合材料
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材料电学性能
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纳米材料合成
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Haibo Wu,Yinsheng Li,Shan Yun,Xuejian Liu,Zhengren Huang,Dongliang Jiang
Porous gelcasted and solid-state-sintered SiC (S-SiC) ceramics with significantly improved connectivity were successfully prepared through the synergistic pore-forming mechanism of direct foaming and particle packing, using fine (D 50 = 0.5 μm) and coarse (D 50 = 5.0 μm) graded SiC powders as the main raw materials. As the proportion of coarse SiC powder increased, the viscosities of aqueous SiC-B 4 C-C slurries sharply decreased, which thus flourished foaming and enlarged bubble-derived-pore diameter in porous S-SiC ceramics, accompanied with the increased amount and size of window. Moreover, abundant particle-packing pores in struts of bubble-derived pores were also formed and even interconnected with each other at 60 wt% of coarse SiC powder. Besides, there was a remarkable increase in porosity from 61.0% to 81.7% and accordingly a significant decline in density from 1.24 g cm −3 to 0.58 g cm −3 as the content of coarse SiC powder increased. The optimized multiple pore microstructures resulted in an amazing nitrogen gas permeability of 1.78×10 −11 m 2 under the condition of an excellent compressive strength of 10.8 ± 2.7 MPa.
研究领域:
材料科学
·
无机非金属材料
·
多孔陶瓷
·
陶瓷加工
·
结构-功能一体化材料
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 49
·期 1
·707-715
·
IF 5.532
Shibin Wu,Keru Song,Fengyue Shi,Jianwen Wang,Songyu Hu,Guangdong Zhao
In this study, ZrC–SiC composite ceramics were prepared with varying Zr/Si molar ratios using sol–gel method. Composites were characterized by Fourier-transform infrared spectroscopy (FT–IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman spectroscopy , and energy-dispersive X-ray spectroscopy (EDS). FT–IR analysis confirmed macromolecular network structure of composites, in which the precursor is composed of polyvinyl butyral (PVB) as main chain, silane molecules are interlinked via –OH moieties in PVB side chains, and Zr atoms are crosslinked with Si in corresponding proportion. Ceramic precursor begins to decompose at a temperature exceeding 1300 °C and is completely transformed into ZrC–SiC composite ceramics with corresponding Zr/Si molar ratio at 1600 °C. Raman spectroscopy and TEM results reveal that after annealing at 1600 °C, ZrC powder uniformly covers surface of SiC ceramics, and high-crystallinity graphite carbon covers ZrC powder.
研究领域:
材料科学
·
陶瓷与复合材料
·
无机化学
·
纳米材料
·
高温材料
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Cheng Su,Bingzhu Wang,Huan Guo,Jixiang Dai,Jianjun Sha
Reactive hot pressing technology facilitates the rapid densification and sintering of UHTC-based composites, presenting significant potential for applications in the aerospace field. However, challenges persist in achieving uniform dispersion of fibers and lowering the densification temperature required for optimal consolidation. In this work, the ZrSi 2 , B 4 C and active carbon were used as the raw materials, and the 3D C f /ZrB 2 -SiC composite with an open porosity of 0.91% were successfully fabricated through the slurry impregnation-drying cycles followed by a reactive hot pressing at 1800 °C. The microstructure evolution and high-temperature mechanical properties were also systematically investigated. The microstructure analysis found that the in situ reaction of ZrSi 2 , B 4 C and active carbon during sintering led to the formation of ZrB 2 -SiC ceramic matrix and effectively promoted densification. The 3D C f /ZrB 2 -SiC composite exhibited an average flexural strength of 232.9 MPa at RT, retaining a value of 112.1 MPa at 1200 °C.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Qian Li,Zhenwei Yang,Yangyang Feng,Daxin Li,Zhaoxue Deng,Su Cheng
(SiC-BN)/BAS composite ceramics were prepared via reactive hot-press sintering at 1500 °C/10 MPa for 1 h. The effects of BN contents (0-14 wt.%) on the phase composition, density, microstructure, and mechanical properties of the composites were systematically investigated. The research showed that the incorporation of coal fly ash (CFA) and BN promoted a partial hexacelsian-to-celsian transformation. The BAS in composite ceramics primarily consists of hexacelsian and minor celsian. The celsian content reaches a maximum at 7 wt.% BN, corresponding to the peak residual compressive stress. The addition of BN leads to a gradual decrease in density and flexural strength, while fracture toughness first increases and then declines. At 7 wt.% BN, the ceramics achieve optimal comprehensive performance, with flexural strength and fracture toughness reaching 194.9 MPa and 3.74 MPa· m 1/2 , respectively. The enhancement is mainly attributed to the synergistic effects of weak interfaces introduced by BN (platelet pull-out, crack deflection, and crack bridging) and residual compressive stress induced by thermal expansion mismatch among the constituent phases.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Yu Shi,Fagen Wang
Ni/SiC catalysts were developed for low-temperature microwave-assisted DRM. • The interaction between microwave and Ni/SiC catalyst were revealed. • Ni/SiC interfacial polarization enhances DRM over conventional thermal. • Reactive intermediates (CH x O*, COOH*) were identified in microwave-assisted DRM. • Ea of CH 4 and CO 2 were decreased under microwave irradiation condition. Dry reforming of methane (DRM) reduces CH 4 and CO 2 emissions by producing syngas. Conventional thermal DRM requires temperatures above 973 K, leading to Ni sintering and carbon deposition. Developing Ni catalysts with high conversion at lower temperatures remains challenging. In this work, we developed Ni/SiC catalysts to investigate DRM under microwave irradiation conditions below 973 K. The Ni/SiC catalysts markedly enhanced performance of low-temperature DRM by microwave catalysis compared to conventional thermal catalysis. The comprehensive characterizations, including physicochemical properties, microwave adsorption properties, and in-situ DRIFTS, reveal that the performance enhancements are primarily attributed to interfacial polarization on the Ni-SiC surface, which generates microcurrent facilitating the formation of reactive intermediates (CH x O*, COOH*) and reducing the activation energies of CH 4 and CO 2 . The work highlights the significance of interfacial polarization on Ni/SiC catalysts in enhancing DRM performance, and the polarization strategy can be applied to other reactions under microwave irradiation conditions. Download: Download high-res image (223KB) Download: Download full-size image
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高影响因子
CIRP Journal of Manufacturing Science and Technology
·
2026
·
IF 5.6
Shang Gao,Haibo Tan,Xin Song
A 16 h CMP service test was established to evaluate slurry degradation during single-crystal SiC polishing. • Slurry reuse caused progressive failure, with reduced MRR and increased surface roughness. • Electrochemistry and XPS revealed weakened oxidation and reduced oxygen-containing reaction layers in aged slurry. • Particle size, zeta potential, and TEM confirmed abrasive refinement, blunting, and poorer dispersion stability. • A BP neural network predicted slurry lifetime, MRR, and surface roughness for slurry health evaluation. Chemical mechanical polishing (CMP) slurries for silicon carbide (SiC) are commonly recirculated to reduce cost and environmental burden due to its extremely low polishing efficiency, rising a challenge to the determination of their lifetime. To address this challenge, this study develops a proactive prediction model for slurry performance and lifetime by integrating failure mechanism analysis with machine learning. During slurry recirculation, the material removal rate (MRR) decreased from ∼1.8 × 10 ³ to ∼1.1 × 10 ³ nm·h⁻¹ , while the surface roughness (Sa) increased from ∼0.12 to ∼0.57 nm. Potentiodynamic polarization, X-ray photoelectron spectroscopy (XPS), and abrasive-state characterization indicated that slurry degradation originates from weakened oxidizing capability together with deteriorated abrasive dispersion and mechanical removal capacity. Considering that slurry lifetime is closely related to the process conditions, the model takes slurry recipe and process parameters as inputs to jointly predict MRR, Sa and lifetime. A back propagation (BP) neural network was employed to establish an eight-input, three-output prediction model because of its ability to capture complex nonlinear relationships among multiple inputs and outputs. The model achieved high predictive accuracy, with all R² values exceeding 0.96, and its robustness was further confirmed by external-condition validation. This work provides a quantitative and transferable framework for slurry lifetime prediction, health monitoring, and process optimization in sustainable SiC CMP. Download: Download high-res image (219KB) Download: Download full-size image
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高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 5.2
Gou Hanwen,Bao Zhiming,Zhang Xianzhong,Jing Lishuai,Pan Yuelei
The use of environment friendly and sustainable biobased
materials
to synthesize high-performance silicon carbide (SiC) aerogel electromagnetic
wave-absorbing (EMW) materials is an important trend, which helps
to promote their development and application. However, due to the
inherent pore structure of biobased templates, the structural design
of SiC aerogels is limited. Here, a salt-induced sol–gel strategy
is proposed to fabricate high-performance SiC aerogels by crushing
the biobased material and then cleverly using the DLVO colloid stability
theory to restructure the biobased template. This strategy gets rid
of the shackles of the inherent pore structure of biobased materials
and designs aerogels composed of oriented SiC nanowire bundles. Benefiting
from the unique structure, the obtained aerogel has a porosity of
∼98%, while enhancing the multiple reflection absorption effect
of the aerogel on EMWs (effective absorption bandwidth = 4.2 GHz)
and extending the thermal performance of the aerogel transmission
path (thermal conductivity reduced to 0.019 W·m –1 ·K –1 ). The salt-induced sol–gel strategy
paves the way for the structural design of high-performance ceramic
aerogel electromagnetic absorbers.
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高影响因子
Catalysis Science & Technology
·
2026
·
IF 4
Qin Zhao,Ruize Sun,Xiaonan Liu,Lexi Tang,Jingge Chen,Jicheng Zhou,Wentao Xu
Propane direct dehydrogenation (PDH) is an important way to prepare propylene (C3H6). However, the conventional thermal catalytic process often has the problems of high reaction temperature and side reactions such as carbon deposition, which makes it difficult to balance the conversion of C3H8 and the selectivity of C3H6. In this work, a new method for direct dehydrogenation of low-temperature and high-efficiency propane (C3H8) to C3H6 by microwave catalysis was proposed, and a Pt-Co/SiBeta+SiC microwave catalyst was developed. The results showed that microwave catalysis significantly improved the C3H8 conversion and C3H6 selectivity of the catalyst, and effectively reduced the reaction temperature. Under 450 °C lowtemperature microwave catalysis (MCRM), the initial conversion of C3H8 was as high as 50.4%, and the initial selectivity of C3H6 was as high as 97.2%. Both are significantly better than the 5.9% initial conversion and 95.6% initial selectivity under conventional thermal catalysis (CRM). It was further found that the microwave irradiation significantly reduced the apparent activation energy of the catalyst from 164.4 kJ•mol -1 under CRM to 68.4 kJ•mol -1 under MCRM. This work provides a new idea for the development of low-temperature and high-efficiency PDH catalytic system, and shows the application potential of microwave catalysis in light hydrocarbon conversion.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Ao Li,Renkai Chang,Zhidong Zhang,Jie Tang,Qipeng Liu,Bing Liu,Mengdong Ma,Qisong Li,Xiaozhe Cheng,Xiaoyan Guan,Qian Zhang,Yunchao Mu,Quan Huang
Silicon carbide (SiC) is a key structural ceramic renowned for its excellent comprehensive properties. However, its inherent brittleness often limits its service lifetime and reliability in high-wear applications. To address this issue, the present work combined the polymer-derived ceramic (PDC) route with spark plasma sintering (SPS), aiming to achieve additive-free densification of SiC-WC composites. Composite powders were prepared from liquid polycarbosilane (PCS) and nano-sized WC, and the resulting ceramics were systematically characterized. With increasing WC content, the composites exhibited synergistic improvements in hardness, fracture toughness, and tribological properties. The sample containing 50 wt% WC (SW-50) achieved a balanced set of properties, including a Vickers hardness of 22.7 ± 0.81 GPa, a fracture toughness of 6.0 ± 0.26 MPa m 1/2 , and a wear rate of 8.5 × 10 −7 mm 3 N −1 m −1 . These values represented improvements of approximately 11%, 46%, and 78%, respectively, relative to the WC-free sample (SW-0). All these findings demonstrates that the PDC-SPS process holds promising for achieving synergistic improvements in composite ceramics via microstructural regulation. This work provides a new and practical strategy for fabricating high-performance SiC-WC composites without sintering additives.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 2
·118804
·
IF 6.3
Xu Shen,Tianyuan Jiang,Feiyan Cai,Li Tian,Jinshan Yang,Shaoming Dong
Pr 3 Si 2 C 2-x O x was employed as a sintering additive to enable low-temperature densification of SiC ceramics. Dense SiC ceramics were obtained through hot pressing at 1550 °C under 20 MPa. During sintering, Pr 3 Si 2 C 2-x O x undergoes oxygen-assisted phase transformation, decomposing into SiC and crystalline Pr-O compounds that form stable solid-solid interfaces at grain boundaries. Microstructural analysis using TEM, HRTEM, and EDS confirmed the formation of these crystalline intergranular phases, while EELS demonstrated partial oxygen substitution in the Pr 3 Si 2 C 2 lattice. Mechanical testing under an Ar atmosphere revealed that the sample with Pr:Si atomic ratio of 1:7 retained a flexural strength of 313 MPa at 1400 °C, corresponding to 95% of its room-temperature strength. Compared with conventional liquid-phase-sintered SiC, the crystalline grain-boundary phases significantly suppress intergranular softening at elevated temperatures. This work establishes a clear link between additive-induced microstructural evolution and high-temperature mechanical stability, providing a promising strategy for the low-temperature fabrication of high-performance SiC ceramics.
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高影响因子
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