Materials
·
2019
·Vol. 12
·期 3
·390
·
IF 2.972
Zhiying Hu,Dingheng Zheng,Rong Tu,Meijun Yang,Qizhong Li,Mingxu Han,Song Zhang,Lianmeng Zhang,Takashi Goto
Highly-oriented polycrystal 3C-SiC bulks were ultra-fast fabricated via halide chemical vapor deposition (CVD) using tetrachlorosilane (SiCl4) and methane (CH4) as precursors. The effects of deposition temperature (Tdep) and total pressure (Ptot) on the orientation and surficial morphology were investigated. The results showed that the growth orientation of 3C-SiC columnar grains was strongly influenced byTdep. With increasingTdep, the columnar grains transformed from <111>- to <110>-oriented. The arrangement of <111>-oriented columnar grains was controlled byPtot. Lotus-, turtle-, thorn-, and strawberry-like surface morphologies were naturally contributed by different arrangements of <111>-oriented grains, and the deposition mechanism was discussed. The wetting behaviors of CVD-SiC samples by molten aluminum were also examined at 1173 K in a high vacuum atmosphere.Keywords:3C-SiC;chemical vapor deposition (CVD);orientation;surficial morphology;wettability
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Jinxin Gan,Lekai Zhao,Jiesong Tan,Yiqing Zeng,Jiangxiao Qiao,Jiahao Chen,Zhaoxiang Zhong,Weihong Xing
High-temperature filtration is an energy-saving and efficient technology for treating high-temperature dusty exhaust, while most of the current studies focus on the design and preparation of high-temperature filtration materials and their application in room-temperature filtration. In this work, SiC ceramic membranes were prepared as typical high-temperature filtration materials to systematically investigate the high-temperature filtration process at 25–400 °C. The experimental results show that the filtration temperature has a significant effect on both initial filtration and cake filtration processes. The increase of temperature results in an increase of gas viscosity, which contributes to the increase of the initial filtration pressure drop (ΔP0). Meanwhile, temperature can affect the forces on dust in the pore of the SiC membrane, and a higher temperature leads to the easy penetration of dust (especially for the ultrafine particles) through the membrane layer into the support body layer at the initial filtration process. Moreover, the higher temperature can reduce the porosity of the dust cake, leading to an increase in the cake pressure drop (ΔPc). All above results were further proved during the experiments on studying the effect of the filtration velocity, dust concentration, and regeneration on the filtration performance of SiC membranes at 25 and 300 °C. Through this work, we expect to shed some light on the design and preparation of high-temperature filtration materials and on the understanding of the high-temperature filtration process.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Bolin Yang,Changliu Kuang,Zhenglong Liu,Chao Yu,Chengji Deng,Jun Ding,Zhoufu Wang,Shixian Zhao
In order to effectively improve the density and oxidation resistance of ZrB 2 -SiC coating materials, HfB 2 was added into ZrB 2 -SiC system and their physical properties, oxidation resistance were explored. It was observed that the flexural strength of the spark plasma sintered sample with 8 vol% HfB 2 was 717.1 MPa, which was 162.6 % higher than that of the sample without HfB 2 (273.1 MPa). At the same time, the oxidation activation energy of the sample with 15 vol% HfB 2 was increased to 511.98 kJ/mol, showing excellent oxidation resistance. The oxidation process is that HfB 2 and ZrB 2 were oxidized prior to SiC to form HfO 2 and ZrO 2 to form a dense oxide layer on the outermost layer of the sample, and SiC reacted to form a second dense SiO 2 layer to hinder oxygen intrusion. In summary, diboride can achieve the synergistic effect of improving the oxidation resistance and structural optimization of ZrB 2 -SiC-HfB 2 coatings composites, which provides a theoretical basis for its practical application.
研究领域:
材料科学
·
高温材料
·
涂层技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Wenxuan Yang,Wei Huang,Cuicui Li,Chongjie Wang,Chitengfei Zhang,Rong Tu,Song Zhang
Highly <111>-oriented 3C-SiC coatings were fabricated by chemical vapor deposition method at different temperatures. As deposition temperature increased from 1473 K to 1773 K, the surface structure of <111>-oriented 3C-SiC transitioned from hexagonal structure with sixfold symmetry to hill-like structure, and finally to conical porous surface composed of stacked short rods. Owing to alteration of surface structure, the hardness of 3C-SiC coatings presented a trend of initially increasing and subsequently decreasing. The 3C-SiC coating deposited at 1673 K possessed the highest hardness, with a value of 42.08 GPa. The average friction coefficient for 3C-SiC/Si 3 N 4 pair ranged from 0.258 to 0.569. The wear rate and hardness exhibited opposite trends. Compared with 3C-SiC coatings prepared at the other three temperatures, the 3C-SiC coating deposited at 1573 K exhibited the lowest wear rate under loads of 5 N, 10 N, and 15 N. Furthermore, the lowest wear rate, recorded at 15 N, was 4.1 × 10 −6 mm 3 /Nm, attributed to high hardness and uniform grain size. The wear mechanism of <111>-oriented 3C-SiC coatings during dry sliding primarily involved fracture, leading to fatigue and third-body wear.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Xiu-Zhi Tang,Ziwen Zhao,Zijian Liao,Jianling Yue,Weiping Gong,He Zhang,Yi Wang
The incorporation of magnetic ingredients is critical for ceramic-based microwave absorbers with high efficiency. However, this task is becoming challenging due to the dispersion and oxidation issues. In this study, metal-organic framework (MOF) ZIF-67 was employed as the precursor of magnetic compounds and combined with a polymer solution to fabricate SiC textiles using the electrospinning technique. The microstructure analysis confirmed the successful introduction of MOF particles within the SiC nanofibers. Further examination of chemical compositions and magnetic properties revealed the encapsulation of magnetic compounds in hybrid SiC textiles. Since the applied fabrication approach ensures a superior dispersion and protection of metal compounds in a ceramic matrix, the microwave absorption of SiC fabric with both dielectric loss and magnetic loss exhibits a high reflection loss of −59.4 dB and a wide effective absorption band of 5.70 GHz. The current fabrication strategy for fabricating microwave absorbers with dual loss mechanisms advances the development of ceramic-based microwave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 5
·6548-6553
·
IF 3.83
Chuangchuang Ruan,Hongzhang Song,Mengmeng Fan,Haoshan Hao,Shaohui Liu
Misfit-layered oxides Ca 3 Co 4 O 9+δ + z wt% SiC ( z = 0.00, 0.025, 0.05, 0.1, 0.2) samples were synthesized using solid-state sintering method and the effects of SiC nanoparticles diapersion on the thermoelectric properties were investigated. Thermoelectric properties of Ca 3 Co 4 O 9+δ + z wt% SiC ( z = 0.00, 0.025, 0.05, 0.1, 0.2) were investigated up to 923 K. Compared with pure sample, the electrical resistivity of SiC-added samples reduces, for Ca 3 Co 4 O 9+δ + z wt% SiC ( z = 0.00, 0.025, 0.05, 0.1, 0.2) ceramic samples with x ≤ 0.05, the electrical resistivity decreases with increasing SiC nanoparticles adding amounts. And, the electrical resistivity exists transition from semiconductor to metal conduction mechanism. While, the thermal conductivity also decreases due to the addition of SiC nanoparticles . As a result, the Ca 3 Co 4 O 9+δ + 0.2 wt% SiC sample had the lowest thermal conductivity of 1.47 W/Km at 923 K, which was 18.4% lower than that of the Ca 3 Co 4 O 9+δ sample. The ZT value of Ca 3 Co 4 O 9+δ + 0.05 wt% SiC can reach 0.218, which is 40.9% higher than the pure Ca 3 Co 4 O 9+δ sample.
研究领域:
材料科学
·
凝聚态物理
·
无机非金属材料
·
能源材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zhimin An,Changshou Ye,Rubing Zhang,Peng Zhou
A novel flexible and recoverable SiC nanofiber aerogel (SiC nf aerogel) was synthesized by electrospinning and freeze-drying methods. The SiC fibers prepared by electrospinning technique, have a fine diameter (~600 nm) and excellent flexibility. On this basis, the fibers are stirred at a high-speed and then subjected to freeze-drying and high-temperature treatment to prepare a SiC nf aerogels. The fabricated SiC nf aerogels possess low density (0.039–0.041 g/cm 3 ), excellent thermal insulation (0.025–0.031 W/(m∙K)), and mechanical properties of recoverable strain (~40%). Meanwhile, the SiC nf aerogels show excellent electromagnetic (EM) wave absorption characteristics, which have the effective absorption bandwidth of 9–11.5 GHz (reflection loss (RL) < −10 dB, more than 90% EM wave was absorbed) and minimum RL value attained −21.41 dB at 10.5 GHz with the thickness of 3 mm. The successful preparation of the novel multifunctional material can be used for high temperature insulation materials and electromagnetic wave absorbing materials in harsh environments.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 30
·12221-12235
·
IF 4.5
Lin Huaizhi,Zhang Biao,Xie Wenqi,Wei Zhilei,He Kai,Xia Hongyan,Shi Zhongqi
SiC-B 4 C ceramic skeleton reinforced graphite composites (MCMB/SiC-B 4 C) with extraordinary mechanical performance were fabricated by SPS method. The influence of sintering temperature and volume ratio of B 4 C/SiC on the microstructure and mechanical performance of the composites was studied. With the introduction of B 4 C in the composites, the B atom diffusion at the B 4 C/graphite interface can be activated when the sintering temperature exceeded 1700 °C, which can significantly improve the interfacial combination of the skeleton reinforcement and graphite matrix. Therefore, the relative density and mechanical properties of the composites can be improved. While the sintering temperature reached 1800 °C and the volume ratio of B 4 C/SiC was 4:6 (the total amount of ceramic reinforcement phase was 40 vol%), the composite exhibited the optimal comprehensive performance with bending strength of 202 MPa and fracture toughness of 3.29 MPa·m 1/2 . These values were 146% and 58% higher, respectively, than those of the composite without B 4 C. The developed graphite matrix composites are expected to be applied to extreme conditions such as high load, high temperature and oxidation environments.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 2
·422
·
IF 3.4
Haoyang Ni,Haiwei Fu,Hongbiao Wang,Hongwen Zhang,Yifan Zhu,Xiuqing Fu
This study aimed to improve the surface hardness and wear resistance of spindle hook teeth with special shapes to reduce the cost of replacing the spindle on cotton pickers. For this goal, a Ni-Co-β-SiC composite coating with different concentrations of β-SiC nanoparticles (0, 1, 2, 3, and 4 g/L) was electrodeposited on the surface of spindle hook teeth. The hardness, elemental composition, and micromorphology of the spindle hook teeth were characterized by microhardness tests, an energy spectrum analyzer, and a scanning electron microscope after cutting with the spindles. The actual wear process of the coating was determined by wear simulation and scratch wear tests, and the effect of the concentration of β-SiC nanoparticles on the properties of the coating was investigated. The results show that Ni-Co-β-SiC composite coating has a typical cellular structure. The hardness first increases and then decreases, and the wear resistance (including friction coefficient, scratch area, and shape of wear area) first decreases and then increases, mainly due to the pinning role and agglomeration of β-SiC nanoparticles. When the concentration of β-SiC was 1 g/L, the hardness reached a maximum of 506.2 HV0.1, the coefficient of friction reached a minimum of 0.13, and the wear area and wear micromorphology reached the most suitable values. Therefore, this Ni-Co-β-SiC composite coating had the best microhardness and wear resistance.Keywords:spindle hook teeth;β-SiC nanoparticles;Ni-Co-β-SiC composite coatings;wear;microhardness;electrodeposition
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Chengmou Deng,Huiyong Yang,Juntong Huang,Ruiying Luo,Lianyi Wang,Zhi Chen,Wei Li,Jintao Qiu,Wenpeng Li
SiC fiber bundles with 1–4 HfSiO 4 sub-layers as the interface coating were successfully obtained with detailed optimized preparation parameters via the non-hydrolyzed sol-gel ( NHSG) and dip-coating method. Subsequently, SiC f /SiC minicomposites reinforced with HfSiO 4 -coated fibers were fabricated through a precursor infiltration pyrolysis ( PIP ) process. The tensile behavior and microstructures of the prepared SiC f /SiC minicomposites treated at room temperature, 800 ℃, and 1000 ℃ in an air atmosphere were investigated. The toughening mechanism of the HfSiO 4 interphase in the SiC f /SiC minicomposites and the corresponding anti-oxidant properties were also thoroughly discussed. Results indicate that SiC f /SiC minicomposites with the HfSiO 4 interphase possessed a nearly pseudo-plastic fracture characteristic and significantly enhanced anti-oxidant properties. It is inspired that the properties of the SiC f /SiC minicomposites could be adjusted by controlling the thickness of the HfSiO 4 interphase to acquire desirable properties such as a higher tensile strength or better oxidation resistance.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 18
·1-13
·
IF 2.8
Li Chaojie,Feng Yonghang,Cui Yi,Zhang Fan,Lv Dongfeng,Liu Pan,Wei Yingna,Wei Hengyong,Bu Jinglong
The NiCo 2 O 4 nanoflakes/SiC fibers composites were prepared by electrospinning, carbon thermal reduction combined with hydrothermal method. The results of SEM, XRD and XPS suggested that the NiCo 2 O 4 nanoflakes/SiC fibers composites were successfully prepared. The NiCo 2 O 4 nanoflakes were generated on the surface of SiC fibers with uniform distribution and loose structure. The NiCo 2 O 4 nanoflakes/SiC fibers composites possess the porous structure and their BET specific surface area is 233.2 m 2 /g. The BJH average pore size and the pore volume are 7.0 nm and 0.4 cm 3 /g, respectively. The structure of fibers and pores can bring the multiple reflections and scatterings, interface polarizations, dipole polarizations and conductivity losses. In addition, there is the synergistic effect of dielectric loss and the magnetic loss in NiCo 2 O 4 nanoflakes/SiC fibers composites. Therefore, the reflection loss of NiCo 2 O 4 nanoflakes/SiC fibers composites could achieve − 56 dB under the thickness of 6 mm at 17.64 GHz, which showed the better microwave absorption behavior than SiC fibers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 6
·3754-3765
·
IF 2.1
Quan Li,Zhicheng Wang,Yang Wang,Jian Yang
High-density Si 3 N 4 -SiC ceramic nanocomposites have exceptional mechanical properties, but little is known about their electromagnetic wave absorption (EMA) capabilities. In this paper, the effects of sintering temperature and starting material compositions on the dielectric and EMA properties of hot-pressed Si 3 N 4 -SiC ceramic nanocomposites were investigated. The real and imaginary permittivities of Si 3 N 4 -SiC ceramic nanocomposites increase with increasing sintering temperature or SiC content, particularly at the sintering temperature of 1850°C and SiC content of 50 wt.%. This is primarily due to the improvement of interfacial and defect polarizations, which is caused by the doping of nitrogen into the SiC nanocrystals during the solution-precipitation process. The real and imaginary permittivities of Si 3 N 4 -SiC ceramic nanocomposites show decreasing trends as sintering aid content increases. Si 3 N 4 -SiC ceramic composites have both good EMA and mechanical properties when they are sintered at 1850°C with 30 wt.% SiC and 5–8 wt.% sintering aids. The minimum reflection loss and maximum flexural strength reach -58 dB and 586 MPa, respectively. Materials with multilayered structural designs have both strong and broad EMA properties.
研究领域:
材料科学
·
电磁学
✓ 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）