JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zijian Zhang,Xinbo He,Tao Zhang,Hongda Guan,Xuanhui Qu
The infiltration has the advantages of high efficiency and near net forming, making it the mainstream method for preparing diamond/SiC composite. However, no pressure was applied during the infiltration and the SiC matrix originated from the silicon-carbon reaction, resulting in a low diamond content and a large amount of residual silicon. This makes it difficult to further improve the properties of the composite, especially the thermal conductivity. Therefore, reaction bonded SiC (RB-SiC) was proposed as the matrix to reduce silicon content, and composition design was carried out to obtain high content of diamond. The results showed that in the prepared composite, the diamond content (61.14 vol%) reached the theoretical maximum of 90.43 %, and the silicon is only 4.79 vol%. Therefore, the thermal conductivity of composite can reach up to 665.47 W/mK. In addition, the influence of SiC particle size on phase composition, microstructure, and properties was analyzed.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Kejia Kang,Rong Tu,Guoqiang Luo,Jian Zhang,Jiawen Zhu,Qiang Shen,Lianmeng Zhang
In this study, Re alloying and self-generated hard phase enhancement were used to improve the strength and toughness of W. The arc-melting W-based composite with 10 wt% Re and 1 wt% SiC addition is composed of toughening W-Re matrix and ceramic particles (W 2 C and W 5 Si 3 ). This composite having high strain capacity (37.1%) at room temperature (more than 5 times of W), exhibits the excellent hardness (5.04 GPa), yield strength (0.92 GPa) and fracture strength (1.78 GPa) due to the synergetic mechanism, grain refinement, and good interfaces bonding state. The synergetic mechanism of Re and SiC addition on strength and toughness was proposed.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2015
·
IF 1.845
Muhammad Rashad,Fusheng Pan,Wei Guo,Han Lin,Muhammad Asif,Muhammad Irfan
Powder metallurgy method was used to synthesize Mg–3Al–1Zn-(1.5Al 2 O 3 –xSiC) composites, to investigate the influence of Al 2 O 3 and SiC hybrid particles on mechanical properties of magnesium alloy. The mechanical characterization of as-extruded composites demonstrated enhanced 0.2% yield strength, and ultimate strength, and reduced fracture strain (Strain at fracture) values both in tension and compression loading. The micro hardness (Vickers hardness, Hv) of composites was increased with increasing reinforcement particle contents. The mechanical characterization of heat treated samples indicated the enhanced fracture strains and reduced microhardness, 0.2% tensile yield strength, ultimate tensile strength. The enhanced fracture strains of heat treated sample are attributed to the dissolved Mg 17 Al 12 intermetallic phases in the matrix. An attempt is made to narrate the effect of heat treatment, presence of Al 2 O 3 and SiC hybrid particles, and their increasing amount on microstructural and mechanical properties of magnesium alloy.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Anzhe Wang,Shuai Wang,Peng Zhou,Zhen Zhang,Yajie Dai,Dongyang Zhang
The fatigue behavior of a ZrB 2 -based ceramic containing SiC and graphite was compared to a ZrB 2 -SiC reference material based on bending testing, quantitative calculations as well as crack growth and fracture characterization. The addition of graphite flake makes ZrB 2 -SiC-Graphite ceramics exhibit fatigue failure behavior at very high stress level (93% of the characteristic strength , σ 0 ), owing to the increased K Ic promoted by crack deflection, bridging, bifurcation and pull-out of graphite, while the fatigue behavior of ZrB 2 -SiC appears when the maximum stress is below ~86% σ 0 . However, both the slow crack growth exponents of the graphite containing ceramic, n and nc values, which reflect the fatigue resistance in static and cyclic fatigue conditions, respectively, are only 1/4 as compared to the reference graphite-free ceramic. This may be due to the weak boride/graphite interfaces, which lead to the decrease of the initial critical stress intensity factor ( K c-initial ) value from 2.6 to 2.0 MPa m 1/2 .
研究领域:
材料科学
·
工程力学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2024
·
IF 4.2
Peihong He,Yulei He,Wenjia Liang,Haidong Long,Ling Ran,Peng Yang,Fang Peng
Silicon carbide (SiC) is an important structural ceramic material, exhibiting exceptional comprehensive properties that are unmatched by metals and other structural materials. In this study, a combination of α-SiC micron powder and β-SiC nanopowder was utilized as precursor materials for high pressure and high temperature (HPHT) sintering. Under a pressure of 5.0 GPa, polycrystalline SiC samples with mixed grain size were sintered within a temperature range from 1000 to 1700 °C, and compared with SiC samples sintered from single micron powder under identical temperature and pressure conditions. The microstructures of the two sets of SiC samples were observed using scanning electron microscopy. Additionally, the stress states and strengthening mechanisms among SiC grains with mixed grain size under HPHT were further analyzed in conjunction with X-ray diffraction results. The polycrystalline SiC composite ceramics sintered at 1700 °C exhibited superior mechanical and thermal properties, achieving a Vickers hardness of 35.2 GPa that is 23.5 % higher than that obtained by conventional spark plasma sintering and even surpassing the hardness of single crystal SiC, demonstrating thermal stability up to 1405 °C in air environment. Transmission electron microscopy was employed to analyze defects and plastic deformation in these samples. The study suggests that the primary strengthening mechanisms of the sintered polycrystalline SiC composite ceramics under HPHT include the increase in micro defects induced by in-situ plastic deformation at elevated temperatures and the effects of high-temperature creep. This study provides new insights into the HPHT sintering of hard materials.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2017
·
IF 3.094
Kejia Kang,Lianmeng Zhang,Guoqiang Luo,Jian Zhang,Rong Tu,Chuandong Wu,Qiang Shen
In this work, to improve the strain capacity of tungsten , β-SiC was added to form W-Si-C multi-phase composites composed of W, W 2 C, and W 5 Si 3 using the arc-melting method. The relationship between microstructure and mechanical behavior was investigated, and a microstructural evolution mechanism was proposed. The grain size of the W was refined significantly from 1071.8 to 5.4 µm as the SiC content increased. The micro-hardness (3.67–12.79 GPa) and ultimate compressive strength (UCS) (0.90–2.29 GPa) of the W-Si-C multi-phase composite obviously increased as the β-SiC content increased to 4 wt% due to the grain refinement and segregation of the W 2 C and W 5 Si 3 at the grain boundaries. The highest strain of UCS (21.9%) was obtained at 1 wt% SiC, which is three times of that of pure W (7.4%) and is a result of the refined W grain size and the potentiation of W 5 Si 3.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Run Yang,Jiaqing Yuan,Cuihong Yu,Kun Yan,Yao Fu,Hangqing Xie,Jian Chen,Paul K. Chu,Xinglong Wu
Multi-component composites consisting of SiC, Ni, NiO, and C nanoparticles (NPs) are fabricated by annealing SiC NPs and the Ni-based metal organic framework (Ni-MOF) in argon. The SiC/Ni/NiO/C nanocomposites exhibit efficient electromagnetic wave absorption (EWA) in comparison with the individual SiC NPs and Ni-MOF component. The minimal reflection loss (RL) is −50.52 dB at 13 GHz for a film thickness of 4.0 mm and the maximum bandwidth is 2.96 dB for RL < −10 dB and thickness of 2.5 mm. The outstanding absorption ability is attributed to the improved conductive paths rendered by the SiC NPs and multiple interfaces rendered by the SiC, Ni, NiO, and C NPs. As a result, interfacial polarization and multiple reflections are enhanced subsequently. This work reveals a new strategy to design and fabricate high-performance EWA materials by incorporating SiC NPs into magnetic 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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Le Lu,Zhaofeng Chen,Yaotong Song,Yue Wang,Qiankang Zheng,Lixia Yang,Zhiyuan Ma,Yiran Lin,Shuangquan Guo,Yuming Xing,Xingpu Wang,Junling Liu,Mengan Cao
The rapid and efficient repair of ceramic matrix composite damaged by foreign objects is a significant technical challenge for extending the service life of aerospace components. In this study, a localized repair method combining gel casting and flash sintering technologies is proposed for repairing SiC f /SiC with penetration damage. The repair process involves the regularization of the damaged area using high-pressure water jet treatment, the construction of a scaffold via gel casting, and the achievement of localized densification and reinforcement through flash sintering. Experimental data demonstrate that the porosity of the repaired region is reduced from an initial 62.25–8.57 %, while the density is increased from 2.09 g/cm³ to 2.28 g/cm³. Additionally, the flexural strength of the repaired samples reaches 112.83 MPa, equivalent to 51 % of the original material's strength. This technique minimizes thermal damage, enhances precision, and provides a practical pathway for extreme remanufacturing of damaged ceramic matrix composites.
研究领域:
材料科学
·
航空航天工程
·
陶瓷基复合材料修复技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2019
·
IF 2.846
Kang Xi,Yong Wang,Kang Jiang,Jing Xie,Ying Zhou,Hanfeng Lu
The interaction between Pt and its various supports can regulate the intrinsic electronic structure of Pt particles and their catalytic performance. Herein, Pt/CeO 2 and Pt/SiC catalysts were successfully prepared via a facile Pt colloidal particle deposition method, and their catalytic performance in CO oxidation was investigated. XRD , TEM, XPS and H 2 -TPR were used to identify the states of Pt particles on the support surface, as well as their effect on the performance of the catalysts. Formation of the Pt–O–Ce interaction is one of the factors controlling catalyst activity. Under the oxidative treatment at low temperature, the Pt–O–Ce interaction plays an important role in improving the catalytic activity. After calcining at high temperature, enhanced Pt–O–Ce interaction results in the absence of metallic Pt 0 on the support surface, as evidenced by the appearance of Pt 2+ species. It is consistent with the XPS data of Pt/CeO 2 , and is the main reason behind the deactivation of the catalyst. By contrast, either no interaction is formed between Pt and SiC or Pt nanoparticles remain in the metallic Pt 0 state on the SiC surface even after aging at 800 °C in an oxidizing atmosphere. Thus, the Pt/SiC shows better thermal stability than Pt/CeO 2 . The interaction between Pt and the active support may be concluded to be essential for CO oxidation at low temperature, but strong interactions may induce serious deactivation of catalytic activity.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·
IF 3.2
Jincheng Zhu,Mengqing Ren,Ming Chen,Lili Wu
High thermally conductive polymer composites have garnered significant attention due to their exceptional performance, given the ever-decreasing size of electronic devices and the rise in power densities. Herein, a new three-dimensional (3D) thermal conductivity network structure has been successfully prepared using double fillers of nickel foam (NF) and modified silicon carbide particles (KSiC). The study compared the effect of different filler contents on the thermal conductivity of composites. Compared to conventional composites, those based on 3D filling networks have significantly improved thermal conductivity. The thermal conductivity of the NF/KSiC/PU composite containing 50 wt% KSiC was 1.18 Wm −1 K −1 , exceeding the cumulative thermal conductivity of the NF/PU and KSiC/PU 50 wt% composites, and 637.5% greater than that of neat PU. Meanwhile, the synthesized NF/KSiC/PU composite maintained a high electrical resistivity above 10 12 Ω·cm and good mechanical properties. This approach might offer novel solutions for developing high-quality packaging materials for advanced electronic devices with exceptional thermal and mechanical properties. Highlights Using SiC and NF Constructs a dual filler network. The dual filler thermal conductivity network can generate synergistic effects. Improving thermal conductivity compared to original polyurethane. Maintaining a high electrical resistivity and good mechanical properties.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jiayi Wang,Shuhang Hu,Qi Tang,Jian Xu,Nianxi Xu,Shansheng Yu,Xiaoyi Wang,Hongwei Tian
Currently, to solve the problem of electromagnetic radiation, it is imperative to develop a thin, lightweight absorber, with a wide bandwidth and an excellent absorption ability. In this study, SiC and CoFe 2 O 4 were combined on reduced graphene oxide (rGO) with immobilized rGO and SiC nanoparticles and varying amounts of CoFe 2 O 4 nanoparticles . A facile one-pot hydrothermal technique was employed to prepare four rGO/SiC/CoFe 2 O 4 composite samples with varied CoFe 2 O 4 concentrations. The electromagnetic properties of rGO/SiC/CoFe 2 O 4 composites were affected by CoFe 2 O 4 content, and CoFe 2 O 4 content was varied to change the electromagnetic properties of composites. The rGO/SiC/CoFe 2 O 4 composite samples were prepared at a graphene oxide (GO) mass of 0.5 g, SiC mass of 0.25 g, and CoFe 2 O 4 mass of 1.5 g, and this composite sample exhibited the best microwave absorption consumption. At 60 wt% of rGO/SiC/CoFe 2 O 4 composite sample, the RL min at 7.4 GHz with a thickness of 2.43 mm was −62.39 dB, and efficient absorption of broadband (EAB) was 1.4 GHz (6.8–8.2 GHz). The EAB was 3.2 GHz (11.8–15 GHz), and the RL min was −59.77 dB at 13.2 GHz with a thickness of 1.39 mm. The RL min at 17.2 GHz was −65.49 dB, and the EAB was 2.3 GHz (15.7–18 GHz), despite a thickness of only 1.06 mm. The rGO/SiC/CoFe 2 O 4 composite comprised carbon materials, magnetic metals, and semiconductors. High-performance microwave absorption was achieved by the introduction of more than one loss mechanism and coordination and supplementation of multicomponent functions. The proposed carbon/semiconductor/magnetic composite material provides a feasible solution for the preparation of excellent microwave absorbing materials in the future.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Yigang Chen,Fang Wang,Yingjie Jia,Nan Yang,Xianming Zhang
Catalytic depolymerization of lignin for preparation of aromatic hydrocarbons without external hydrogen was first carried out over nano-SiC catalyst in supercritical ethanol. Mixture of the catalyst and lignin was innovatively suspended in a closed reactor and small-molecular aromatic hydrocarbons were successfully achieved at 500 °C. Results revealed that not only did conversion of lignin increase sharply under the nano-SiC catalyst, but also phenols were not detected. The increase of residence time under the Fe-SiC catalyst did not change distribution of the liquid products besides the yield improvement, suggesting that the catalyst was suitable and selective towards formation of small-molecular benzenes, especially C 6 –C 8 benzenes. Preliminary studies found that lignin depolymerization and deoxygenation were successfully fulfilled during the reactions, which provided a very effective route to conversion of lignin into high added-value molecules as transportation fuel additives.
研究领域:
生物化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）