Materials Research Express
·
2020
·Vol. 7
·期 1
·016438
·
IF 1.929
Yong Lian,Xianyi Dai,Jin Zhang
In the present work, particles of SiC were applied to the micro-arc oxidation (MAO) treatment of Ti6Al4V, characterization of MAO coatings with different SiC particle concentration were evaluated. X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) results show that the structure and morphology of MAO ceramic coatings could change with different amounts of SiC in the electrolyte. Both of the number and size of the pores on the ceramic coating surface were decreased, while the layer thickness increased with the increase in SiC particles in the electrolyte. A dense double-layer structure coating composed of a Ti-based layer and a SiC-based layer with a thickness of about 40 μm was prepared. It was shown that the addition of SiC particles participated in the process of micro-arc oxidation and changed the microstructure of MAO coating.
研究领域:
材料科学
·
表面工程
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DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 9
·2007
·
IF 3.2
Bo Xiao,Xia Zhang,Yongzhao Hou,Fagang Wang,Guangwu Wen
SiC-W2B5/C composites were prepared through a novel and simple processing route (reaction hot-pressing). The density of composites increased from 96.1% to 99.2% with the increase in SiC content from 5 to 30 vol%, leading to significant improvements in mechanical properties such as flexural strength, fracture toughness, and Vickers hardness, which for the highest W15S30 composite were measured at 292.3 MPa, 6.12 MPa·m1/2, and 3.32 GPa, respectively. The fracture morphology exhibited a mixed fracture mode of transgranular and intergranular, along with a pull-out phenomenon, indicating a well-combined interface. The sintering process involved Si powder acting as a liquid-phase sintering agent, reacting with B4C to increase the B concentration and promote the generation of W2B5, as well as reacting with the carbon phase to generate a transition phase of Si-B-C. The presence of this transition phase enhanced the interface bonding strength and catalyzed the graphitization process. As the SiC content increased, the promotion effect became more pronounced, with the degree of graphitization increasing from 59.2% to 66.2%.
研究领域:
材料科学
·
陶瓷材料
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 5
·1-17
·
IF 2.8
Wang Jianqi,Wang Yang,Chen Zhou,Wang Changyang,Yang Jilong,Yang Jian,Gu Jian,Li Quan
Silicon carbide (SiC) presents significant application prospects in the light of wave-absorbing, attributed to its excellent electrical and physicochemical properties. By utilizing the synergistic loss mechanism, SiC compounding with the magnetic can markedly enhance the absorption efficiency of electromagnetic wave (EMW) which is an important technical mean to optimize the wave-absorbing capabilities. In this paper, polycarbosilane (PCS) was used as a precursor to prepare (SiC) p and Ni@SiC composites were successfully synthesized by chemical plating without palladium activation, in order to explore the lightweight SiC-based wave-absorbing material that exhibits intense absorption and wide bandwidth. It is shown that when the (SiC) p is about 60 μm, the A2-Ni@SiC demonstrates the minimum reflection loss (RL min ) of −50.27 dB at 8.04 GHz with an effective absorption bandwidth (EAB) of 5.64 GHz at 3.0 mm (from 7.24 to 12.88 GHz). When the particle size of (SiC) p is further refined to about 5 μm, the prepared B2-Ni@SiC shows exceptional wave-absorbing performance achieving the RL min of −66.10 dB at 3.4 mm, along with an EAB of 4.44 GHz (from 5.56 to 10.0 GHz). The enhancement in wave-absorbing is likely due to the increased interfacial polarization at the Ni-(SiC) p interface, as well as the improved matching of the hybridized constituents.
研究领域:
材料科学
·
电磁学
·
复合材料
·
微波技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yuanjie Wang,Xueliang Pei,Haoyi Li,Xin Xu,Liu He,Zhengren Huang,Qing Huang
Curing treatment is essential for ceramic precursors to maintain their shape during pyrolysis. In this study, a photosensitive SiC ceramic precursor was synthesized by chlorinating partial Si–H groups of polycarbosilane (PCS) with Cl 2 followed by reacting with hydroxyethyl acrylate. According to 1 H NMR and element analysis , about 10% structural unit of PCS was grafted with the acrylate group. After mixing with photo-initiator, the acrylate-grafted PCS transformed from soluble and fusible state to insoluble and non-fusible state under UV light. Its curing rate with related ceramic yield and oxygen content were compared with PCSs cured by the traditional air oxidation and electronic radiation. By electrospinning synchronized with UV illumination and pyrolyzing the acrylate-grafted PCS, one-dimensional continuous SiC fibers were prepared. The effects of pyrolysis temperature on the morphology, crystallographic structure and elemental composition were also characterized and discussed.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 15
·期 10
·2002-2008
·
IF 3.879
Huilin Hou,Chunlei Dong,Lin Wang,Fengmei Gao,Guodong Wei,Jinju Zheng,Xiaomin Cheng,Bin Tang,Weiyou Yang
It is critically important to limit the oxidation of pure SiC in humid air, especially for mesoporous SiC with large surface areas. One of the effective routes is to introduce an inert outer layer around the surface of SiC to inhibit the formation of the SiOx oxides. In present work, we report the fabrication of mesoporous graphite/SiC hybrid fibers via electrospinning of the polymer precursors containing polyureasilazane, polyvinylpyrrolidone, cetyltrimethylammonium bromide and paraffin oil, combined with subsequent high-temperature pyrolysis treatment. The resultant fibers were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). It is found that the paraffin oil content has a profound effect on the growth of the fibers, enabling the fabrication of mesoporous graphite/SiC hybrid fibers with tunable structures and high purities. It is expected that the introduced graphite could significantly improve the surface properties of SiC mesoporous fibers, which could inspire and enhance their potential applications in photocatalysts and catalyst supports.
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jie Tang,Meng Liu,Yuquan Wei,Yong Yang,Zhengren Huang
Liquid silicon infiltration (LSI) is a fast and low-cost method for the manufacturing of C f /SiC composites. However, due to the high reactivity of LSI process, the carbon fiber is easily to be eroded by liquid silicon. A recognized solution is to coat the fiber surface with a protective layer. Here, we report a preparation method of C f @SiC short fiber for carbon fiber protection in LSI process. First, C f @HTC short fiber with controllable thickness (1–10 μm) and uniform Hydrothermal carbon (HTC) coating was prepared by hydrothermal method . After the first LSI, silicon carbide layers which was derived from the reaction of HTC and liquid silicon had been successfully constructed on the carbon fibers with the thickness rang form 1–3 μm. This strategy demonstrates a tantalizing possibility and promising prospect to the preparation of light and high strength C f /SiC ceramic matrix composites with good fiber protection.
研究领域:
材料科学
·
复合材料
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DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2012
·
IF 2.003
Rujie He,Ping Hu,Xinghong Zhang,Chen Liu
Complex-shaped ZrB 2 –SiC ultra high temperature ceramic components were successfully fabricated by gelcasting technique and pressureless sintering. When 0.4 wt% poly(acrylic acid) (PAA) was used as dispersant and the pH value was 10, an aqueous ZrB 2 –SiC–B 4 C–C slurry with a high solid loading up to 50 vol% but low viscosity (3.1 Pa s at 60 s −1 ) was prepared. For gelcasting process, the suitable monomers content (AM and MBAM) and the mass ratio of monomers (AM/MBAM) were selected as 3 wt% and 15:1, respectively. After pressureless sintering at 2100 °C for 2 h, ZrB 2 –SiC ceramics (using B 4 C and C as sintering additives) finally achieved about 98% density. Investigation of the mechanical properties revealed a flexural strength of 405±27 MPa and a fracture toughness of 4.3±0.3 MPa m 1/2 . Complex-shaped ZrB 2 –SiC ceramic components with homogeneous microstructure were also successfully produced. This study confirms that gelcasting is a reliable process for the fabricating of complex-shaped ultra high temperature ceramic components with satisfied properties.
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Pengcheng Chen,Siyi Jing,Yanhui Chu,Pinggen Rao
Residual oxide impurities in high-temperature structural ceramics containing carbon-based reinforcements can react with the reinforcements during sintering to weaken their toughening effect. To eliminate such effect, a simple HF treatment technique is proposed. In this work, SiC ceramics and carbon nanotubes (CNTs)/SiC ceramic composites were fabricated by spark plasma sintering . The results showed that, after HF treatment, the structure of incorporated CNTs in the composites was unaffected and a slight improvement of relative density was fulfilled. The fracture toughness improvement of the composites from 4.4 ± 0.4 MPa m 1/2 to 5.4 ± 0.5 MPa m 1/2 with indentation method (IM) after HF treatment was also observed due to crack branching, CNT pull-out and crack bridging.
研究领域:
材料科学
·
工程学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
W.Z. Sun,J.G. Cheng,Z.K. Huang,Y. Jiang,L.E. Wu,L.M. Liu
During investigation of the phase relations in the SiC–ZrO 2 –CaO ternary system, it was revealed that ZrO 2 reacted with SiC and CaO to form ZrC and calcium silicate via a series of solid-state reactions. Because these reactions may provide a new route to reaction-sintering of ZrC ceramics, ZrC/SiC and ZrC/salt composites, the formation process of the ZrC phase was analyzed. Subsolidus phase diagram of the related SiC–SiO 2 –ZrC–ZrO 2 –CaO (Si–Zr–Ca–O–C) quinary system at 1400 °C was presented.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Pengpeng Xu,Junyi Yu,Chaofan Li,Suibin Luo,Shanming Ke,Yangbo Zhou,Shuhui Yu,Rong Sun
Flexible polymer composites with high dielectric constants and low dielectric losses at high frequencies are highly desired in microwave and RF applications. However, a high dielectric constant is often obtained at the expense of flexibility because a high loading of filler is needed. In this work, we synthesize a core-shell structured 1D filler by coating high-dielectric-constant PbTiO 3 onto the surface of low-thermal-expansion-coefficient SiC nanofibers , which are then incorporated into the epoxy matrix together with BaTiO 3 nanoparticles to form the multi-phase BaTiO 3 /SiC@PbTiO 3 /epoxy composite film . A high dielectric constant (35 at 100 Hz and 20 at 5 GHz) and a low dielectric loss (0.023 at 100 Hz and 0.13 at 5 GHz) are achieved as the filling content of SiC@PbTiO 3 and BaTiO 3 is 5.24 wt% and 80 wt%, respectively. Prediction models of the effective dielectric constant of polymer-based composites reveal that a continuous polarization network is constructed in the composites owing to the physical contact between BaTiO 3 and PbTiO 3 . The construction of the multi-phase filler provides a feasible way to effectively adjust and improve the dielectric properties of polymer-based composite films.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lang Zhang,Haibo Wu,Zehua Liu,Yitian Yang,Huan Liu,Xishi Wu,Bingbing Pei,Jianshen Han,Zhengren Huang
The mullite-whisker-modified SiC porous ceramics were prepared by the oxide bonding method, using two additives (MoO 3 as a mineralizer and AlF 3 as a crystallization catalyst) to promote the growth of mullite whiskers. The microstructure and comprehensive properties of the sintered bodies were adjusted by controlling the sintering temperature and the additive content. The mullite whiskers obtained by controlling the sintering temperature and additives exhibit excellent microstructural characteristics (diameter: 0.1–0.5 μm, length: 3–6 μm, length-to-diameter ratio: 15–25). These formed mullite whiskers effectively intercepted particulate matter, and their interlocking structure provided higher strength to the sintered body. The resultant mullite-whisker-modified SiC porous ceramics demonstrated remarkable mechanical strength (43.8 ± 0.1 MPa) while maintaining high porosity (41.27 %) and excellent gas permeability (1.96 × 10 −14 m 2 ). After undergoing five thermal shock cycles at 850 °C, the material retained 92.69 % of its original strength and exhibited superior filtration efficiency of 99.6 % for PM2.5 particles.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
MOLECULES
·
2018
·Vol. 23
·期 9
·2296
·
IF 3.098
Yao Huang,Run Yang,Shijie Xiong,Jian Chen,Xinglong Wu
Silicon carbide (SiC) has a large number of polytypes of which 3C-, 4H-, 6H-SiC are most common. Since different polytypes have different energy gaps and electrical properties, it is important to identify and characterize various SiC polytypes. Here, Raman scattering is performed on 6H-SiC micro/nanocrystal (MNC) films to investigate all four folded transverse optic (TO) and longitudinal optic (LO) modes. With increasing film thickness, the four folded TO modes exhibit the same frequency downshift, whereas the four folded LO modes show a gradually-reduced downshift. For the same film thickness, all the folded modes show larger frequency downshifts with decreasing MNC size. Based on plasmons on MNCs, these folded modes can be attributed to strong coupling of the folded phonons with plasmons which show different strengths for the different folded modes while changing the film thickness and MNC size. This work provides a useful technique to identify SiC polytypes from Raman scattering.Keywords:SiC micro/nanocrystals;plasmon–phonon coupling;folded phonons
研究领域:
材料科学
·
物理学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）