Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Han Rao,Weiping Li,Zilu Luo,Huicong Liu,Liqun Zhu,Haining Chen
To study the nucleation and growth mechanism of Ni/SiC composite coatings, electrodeposition was conducted in the Ni bath containing SiC particles with different sizes. Compared to the Ni coating electrodeposited from the bare Ni bath, the Ni/SiC composite coatings exhibited similar grain size but rougher surface morphology due to the incorporation of SiC particles. By means of chronoamperometry (CA) and linear sweep voltammetry (LSV) techniques, it was found that the introduction of SiC particles did not change the nucleation mode of Ni: the Scharifker-Hills three-dimensional instantaneous nucleation mode. However, the nucleation sites on the cathode were reduced due to the inert surface and low conductivity of SiC particles. At a step potential of −0.94 V, Ni presented the maximum nucleation density ( N 0 ) of 3.09 × 10 7 cm −2 , which was reduced by one order of magnitude for the Ni/SiC. Furthermore, SiC particles in the bath would extend the diffusion path of Ni 2+ ions, resulting in the decrease in diffusion coefficient from 1.04 × 10 −7 cm 2 s −1 (Ni) to 9.91 × 10 −9 cm 2 s −1 (Ni/50 nm SiC), 1.83 × 10 −8 cm 2 s −1 (Ni/500 nm SiC) and 2.29 × 10 −8 cm 2 s −1 (Ni/5 μm SiC), suggesting the “Blocking effect”. COMSOL simulation further confirmed the “Blocking effect”. The “Blocking effect” would lead to excessive interface gaps around 5 μm SiC particles due to the uneven electrodeposition of Ni. To address the issue, we proposed that adding non-ionic surfactants into the bath to lower the electrochemical reaction rate of Ni 2+ ions and accordingly gained composite coatings with fine continuity.
研究领域:
材料科学
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电化学
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表面工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Andong Hua,Yishi Su,Yunpeng Cai,Di Zhang,Qiubao Ouyang
Aiming at developing new B 4 C/Al neutron absorbing materials with both high thermal neutron absorption performance and high-temperature strength for neutron shielding applications, B 4 C/SiC/2024Al composites were fabricated by powder metallurgy process. TEM results revealed that SiC nanowires were distributed at Al grain boundaries and bonded tightly with Al matrix . Grain boundary sliding and grain rotation were efficiently restricted and prevented dislocation annihilation at GBs. The thermal stability of composite was improved by adding SiC nanowires and achieved a high-temperature strength of 163.4 ± 1.8 MPa at 573 K, which was increased by 92.2 % compared to the composite without addition of SiC nanowires. By analyzing the strengthening mechanism , dislocation strengthening was the dominant factor in the improvement of high-temperature strength. As for neutron absorption application, B 4 C/SiC/2024Al composite exhibited not only good high-temperature strength but also remarkable neutron absorption performance and matched thermal conductivity and coefficient of thermal expansion .
研究领域:
材料科学
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核工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xinyue Liu,Hongwei Zhao,Shan Jiang,Shuai Wu,Tong Zhao,Lixiang Li,Xin Geng,Haiming Yang,Weimin Zhou,Chengguo Sun,Yiqing Chen,Baigang An
Both SiC and porous carbons have been widely used in the fields of catalysts, ceramics, electrode materials and electromagnetic materials since their advantages of excellent chemical and thermal stability, good conductivity, flexibility and stiffness. However, pore construction of SiC still faces considerable difficulty comparing to carbon materials with a large variety of pores. Herein, by developing a novel method combining the silanization of SBA-15 template, acetylene CVD and magnesiothermic reduction reaction (MRR) technology, a novel porous material of OM-SiC@OMC that the ordered mesoporous SiC interfaces with the ordered mesoporous carbon has been successful synthesized. The silanization enhances the activity of carbon deposition into the pores of SBA-15 template, MRR results in the formation of SiC between the interface of SiO 2 and carbon. After the template removal, a novel mesoporous composite material of OM-SiC@OMC has been successfully obtained. Interestingly, OM-SiC@OMC contains two types of ordered mesopores interfacing with each other by the pore wall of SiC phase and carbon phase, respectively. As electrode materials of supercapacitors , OM-SiC@OMC exhibits a capacitance of 194.8 F g −1 with an excellent retention rate of 97.8% after 10,000 cycles. The present study explores a novel ordered porous materials constructed by the interfaced pores of carbon and carbide , it is promising to find good applications of these multi-interfaced porous materials.
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Advances in Applied Ceramics
·
2025
·
IF 1.6
Maohui Li,Mingjun Zhang,Bo Ma,Wenzhou Sun,Yanmin Wang,Youjun Lu
The brittleness of silicon carbide restricts its wide application. Graphene as a superior second-phase material can improve the toughness and brittleness of silicon carbide. In this article, a graphene/β-SiC ceramic material was prepared with 1–3 wt.% graphene added in β-SiC matrix via pressure-free sintering at 2120°C for 60 min. The effect of the graphene addition on the phase composition, bulk density, porosity, and mechanical properties of ceramic material was investigated. The results show that the bulk density of graphene/β-SiC ceramic material decreases, the porosity of openings increases, and the bending strength, hardness, as well as fracture toughness firstly increase and then decrease as graphene addition increases. Compared with β-SiC ceramic without graphene, the optimum properties of graphene/β-SiC ceramic with graphene addition of 1 wt.% (i.e. a fracture toughness of 5.07 MPa m1/2, bending strength of 410.84 MPa and hardness of 27.72 HV) can be obtained, which are increased by 35.56%, 13.35%, and 3.8%, respectively. The fracture morphology indicates that the crack deflection is the main mechanism of toughening β-SiC ceramic with graphene.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 4
·1147-1150
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IF 2.787
Gaoming Zhu,Xiaohong Wang,Peizhong Feng,Zhangsheng Liu,Jinan Niu,Farid Akhtar
MoB and SiC particulate reinforced MoSi 2 matrix composites were synthesized in situ from Mo, Si, and B 4 C powder mixtures by self-propagating high-temperature synthesis (SHS). The SHS MoSi 2 –MoB–SiC products were vacuum hot-pressed (HPed) at 1400°C for 90 min to fabricate high-density (> 97.5% relative density) bulk composites. Microstructure refinement and improvements in the Vickers hardness and fracture toughness of the HPed composites were observed with increasing B 4 C content in the reaction mixture. The HPed composite of composition MoSi 2 –0.4MoB–0.1SiC exhibited grain size of 1–5 μm, Vickers hardness of 12.5 GPa, bending strength of 537 MPa, and fracture toughness of 3.8 MPa.m 1/2 . These excellent mechanical properties indicate that MoB and SiC particulate reinforced MoSi 2 composites could be promising candidates for structural applications.
研究领域:
材料科学
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陶瓷材料
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Pengju Chen,Peng Xiao,Tian Tian,Yang Li
Ytterbium silicate (Yb 2 Si 2 O 7 ) and lanthanum zirconate (La 2 Zr 2 O 7 ) ceramic powders were synthesized by the sol–gel method. A novel tri-layer La 2 Zr 2 O 7 /Yb 2 Si 2 O 7 /SiC environmental barrier coating was prepared on the surface of C/SiC composites to improve the service temperature of the coating (above the Si melting point, 1683 K). Results show that both Yb 2 Si 2 O 7 and La 2 Zr 2 O 7 ceramic powders had extremely high purity and were accompanied by a large number of nanoparticles. The tri-layer La 2 Zr 2 O 7 /Yb 2 Si 2 O 7 /SiC coating can efficiently prevent the oxidation failure of C/SiC composites in 1773 K air environment for more than 100 h with slight weight loss of 5.71 × 10 −3 g·cm −2 and the matching weight loss rate of 5.71 × 10 −5 g·cm −2 ·h −1 . No significant chemical reaction was observed between Yb 2 Si 2 O 7 middle and La 2 Zr 2 O 7 outer coatings during the oxidation process at 1773 K, indicating that the tri-layer La 2 Zr 2 O 7 /Yb 2 Si 2 O 7 /SiC coating had better oxidation stability in 1773 K air environment.
研究领域:
材料科学
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涂层技术
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 99
·期 6
·2131-2137
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IF 2.787
YeHong Cheng,Yushi Qi,Ping Hu,Shanbao Zhou,Guiqing Chen,Jiadong An,Kunfeng Jin,Wenbo Han
To avoid introduction of milling media during ball-milling process and ensure uniform distribution of SiC and graphite in ZrB 2 matrix, ultrafine ZrB 2 –SiC–C composite powders were in-situ synthesized using inorganic–organic hybrid precursors of Zr(OPr) 4 , Si(OC 2 H 5 ) 4 , H 3 BO 3 , and excessive C 6 H 14 O 6 as source of zirconium, silicon, boron, and carbon, respectively. To inhabit grain growth, the ZrB 2 –SiC–C composite powders were densified by spark plasma sintering (SPS) at 1950°C for 10 min with the heating rate of 100°C/min. The precursor powders were investigated by thermogravimetric analysis–differential scanning calorimetry and Fourier transform infrared spectroscopy. The ceramic powders were analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. The lamellar substance was found and determined as graphite nanosheet by scanning electron microscopy, Raman spectrum, and X-ray diffraction. The SiC grains and graphite nanosheets distributed in ZrB 2 matrix uniformly and the grain sizes of ZrB 2 and SiC were about 5 μm and 2 μm, respectively. The carbon converted into graphite nanosheets under high temperature during the process of SPS. The presence of graphite nanosheets alters the load-displacement curves in the fracture process of ZrB 2 –SiC–G composite. A novel way was explored to prepare ZrB 2 –SiC–G composite by SPS of in-situ synthesized ZrB 2 –SiC–C composite powders.
研究领域:
材料科学
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陶瓷
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Jingsi Wang,Shuang Liu,Guibin Lou,Ya Chen,Haozhe Pang,Yachao Song,Syed Mesum Raza Naqvi,Kai Zhou,Zongjun Tian,Muhammad Ali Nasir,Dongsheng Wang,Lida Shen
High infrared emissivity coatings have important engineering value in aerospace and electronic devices. In this study, a new method for preparing high infrared emissivity coatings using magnetic field-assisted jet electrodeposition was prepared. The magnetic field-assisted jet electrodeposition technique can be used to prepare coatings with rough structures, and the infrared emissivity of nickel particle coatings can reach 0.80 at a magnetic field intensity of 100 mT, which is significantly improved compared with the nickel coatings (0.155) prepared by conventional electrodeposition. A nickel-based SiC composite coating with high infrared emissivity was prepared by combining magnetic field-assisted jet electrodeposition with SiC particles. Compared with the nickel particle coating, the infrared emissivity of the nickel-based SiC composite coating is further improved. At a concentration of 6 g/L SiC particles, the infrared emissivity of the nickel-based SiC composite coating reached 0.94. The synergistic effect of magnetic field-assisted jet electrodeposition and SiC particles can realize the nickel coatings into coatings with high infrared emissivity.
研究领域:
材料科学
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电化学
·
红外技术
·
表面工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Kejie Wang,Rongzhen Liu,Chonggao Bao
In this study, the method and mechanism of the improvement of the curing thickness of SiC by stereolithography (SLA) were investigated, the rheological properties of SiC paste were optimised, and the problem of cracking problem during debinding was solved. The best moulding process for preparing SiC ceramics with the Ceramaker 900 equipment was studied. Oxidation at 1180 °C for 1 h and hydroxylation with 0.6 mol/L H 2 O 2 were the best modification processes for SiC powder. SiC paste with good rheological properties and high curing thickness was prepared using a resin system of BPA, HDDA, TPGDA, TMPTA, DPHA, and A-BPEF (mass ratio = 9:7:5:20:15:6). The best debinding process for SLA SiC was segmented debinding. The bulk density, total porosity, and room temperature bending strength of the SiC ceramics obtained are 2.13 g/cm 3 , 10.2%, 229 MPa, respectively. The nanoindentation elastic modulus and hardness of SLA SiC ceramics were found to be 18.7 and 1.66 GPa, respectively. Through this process, a lattice structure of SiC parts with good surface quality was prepared.
研究领域:
材料科学
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制造工程
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产品关联
DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 3
·329
·
IF 3.236
Rong Tu,Chengyin Liu,Qingfang Xu,Kai Liu,Qizhong Li,Xian Zhang,Marina L. Kosinova,Takashi Goto,Song Zhang
SiC epitaxial wafers offer enormous potential for a wide range of telecom technologies due to their excellent properties. The experimental process was simulated by software, and the contour of gas flow velocity and raw material mass fraction inside the chamber were obtained. SiC films were epitaxially grown on 4H-SiC single crystalline substrates at different temperatures for one batch, using SiCl4, CH4, and H2as precursors. With increasing temperature, the crystal phase changed from 4H-SiC at 1773 K to a mixture of 4H- and 3C-SiC, and then a mixture of 3C-SiC and graphite at higher than 1923 K. The film was mainly (004)-oriented 4H-SiC and (111)-oriented 3C-SiC.Keywords:SiC film;high-frequency induction-heated halide CVD;crystalline phases distribution;microstructure;orientation
研究领域:
材料科学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Li-Xiang Wu,Wei-Ming Guo,Wen-Bin Niu,Rui-Lin Lin,Shi-Kuan Sun,Jia-Xiang Xue,Hua-Tay Lin
Pressureless joining of SiC ceramics at low temperature was developed using Ti powder interlayer. Phase assemblage and microstructure of SiC joint revealed that the products after diffusion bonding mainly consisted of Ti 5 Si 3 and TiC owing to the comparatively low joining temperature. Additionally, Si and C elements were found to be with higher penetration depth in the Ti interlayer. Benefitting from the lower proportion of the brittle Ti 5 Si 3 phase and porosity, shear strength reached a relatively higher value of 41 MPa after joining at 1200 °C for 30 min.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Junjie Wang,Cheng Wang,Haitao Yang,Hui Zhang,Dunyan Jiang,Shikuo Li
Design novel interfacial structure material to achieve highly efficient electromagnetic interference (EMI) shielding is one of the biggest challenges. Herein, the asymmetric C/SiC nanofiber film with conductive-dielectric gradient was precisely in situ prepared through the carbon thermal reduction reaction during the Flash Joule Heating (FJH) process. For the Fick diffusion of SiO 2 vapor, the SiC nanoparticles were gradually anchored on the carbon fibers with a gradient distribution from bottom to top. The electrical conductivity of the asymmetric C/SiC nanofiber film was thus continuously increasing from about 7.97 S cm −1 (bottom) to 0.59 S cm −1 (top). As a result, the asymmetric C/SiC nanofiber film achieved a maximum EMI shielding effectiveness (62.0 dB) in the X-band with a thickness of 1.5 mm, and superior stability in various extreme conditions. Moreover, the EMI shielding effectiveness of the asymmetric C/SiC nanofiber film can be adjusted by altering the incident direction or the film thickness. The effects of gradient structure on the potential distribution and electromagnetic wave loss for the asymmetric film were investigated by the Kelvin probe force microscope and finite element simulation analysis. This work provides a novel insight into designing reasonable interfacial structure to modulate EMI shielding performance.
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）