INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2023
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IF 3.6
Xiangyu Tian,Yilong Liang,Guanyu He,Liangliang Zeng
Graphene oxide (GO) was used to adsorb submicron alumina (Al 2 O 3 ) as a composite reinforcing phase, and after sintering, the reduced GO and Al 2 O 3 synergistically enhanced the performance of WC-8Co cemented carbide . It was worth noting that the enhanced phase existed at the grain boundary in the form of RGO/Al 2 O 3 adsorption structure or partial alumina alone, which wraped the WC grain and hindered its growth. The results showed that the strengthening mechanism of the alloy was grain refinement, dispersion, solid solution , etc., and it was calculated that grain refinement was the main mechanism of alloy hardness enhancement. When 0.1 wt% RGO/Al 2 O 3 was added, the average grain size of the alloy was reduced to 0.65 μm, and the density reached 99.46%. Additionally, the mechanical properties of the alloy were optimized in this study. For WC-8Co-0.1RGO/Al 2 O 3 alloy, the hardness was increased by 18.05%, and the fracture toughness was increased by 27.24% relative to the control sample. In addition, the RGO/Al 2 O 3 significantly enhanced the thermal conductivity of the alloy, promoted densification, and reduced the degree of oxidative wear caused by friction. RGO/Al 2 O 3 in the alloy protected the matrix and improved its frictional resistance by adhering to the surfaces of the wear tracks and combining with the wear debris to form a stable friction layer.
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
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2025
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IF 6.9
Weihua Cao,Xiaolong Ma,Xiao Yang,Yiwei Guo,Changxin Liu,Yu Dong,Xiaowen Qi
Three-phase coupled composites were manufactured to holistically evaluate their load-response mechanisms. Tribological properties in ball-on-disk tests were correlated with GF content and different applied loads. Tribological properties of embedded semirings were better than polymer semirings in semiring tests, resulting in the decrease of COF by 44 %, and the reduction in wear depth by 98.8 %. Embedded semiring with the inclusion of 3 wt% GF possessed remarkable tribological properties, as evidenced by COF of 0.071 and wear rate of 22.7 × 10 −4 mm/h. Stress and strain distributions, as well as associated coupling mechanism among all three phases are revealed with the aid of FEA and MD simulation. Overall, this study offers a fundamental theoretical of polymer composites for self-lubricating bearings applications.
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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2024
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IF 5
Le Lyu,Guanqiu Hao,Yuhao Wang,Yingying Chen,Yongping Chen,Xiangdong Liu
This study presents a microfluidic approach for fabrication of compound phase change fibers (CPCFs) encapsulating nano-enhanced phase change material (PCM), RT25, for thermal regulation. The produced fibers are flexible and have strong compatibility and durable stability, with their size and the proportion of PCM can be precisely controlled by the microfluidic approach. Especially, a hydroxy surface modification method was used to uniformly disperse SiO 2 nanoparticles into the RT25, aiming to enhance the thermal regulation performance of the CPCFs. Thermal performance test was conducted and it indicated that, compared with the compound phase change fiber (CPCF) with pure RT25, the CPCF incorporated with 2 wt% SiO 2 nanoparticles presented a notable increase in thermal conductivity by 46.52 % and 45.51 % for solid-state and liquid-state enclosed PCM with a limited reduction in both melting and solidification enthalpies by 9.21 % and 10.1 %, respectively. Moreover, an experiment simulating the heat dissipation scenario of the electronic cabinet under intermittent running with short operation and long rest was conducted by using the CPCFs. It showed that adding SiO 2 nanoparticles can improve the heat absorption process (solid-to-liquid phase) via the CPCFs with a smaller temperature increase (i.e., the maximum temperature of simulated inner electronic device in the cabinet for the repeated intermittent running) and it is also able to make the CPCFs renew (liquid-to-solid phase) more quickly and ready for heat absorption process in the next cycle. These CPCFs offer a promising alternative for more efficient and sustainable thermal management of the electrical/electronic equipment.
研究领域:
材料科学
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热能工程
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纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2020
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IF 4.495
Qinghua Feng,Panpan Lin,Tiesong Lin,Peng He,Yan Liu,Weimin Long,Jian Li
A novel design of a multi-layered joint architecture, characterized by the controllable spatial distribution of ceramic reinforcements, was obtained, when brazing ZrB 2 -SiC ceramics and Ti-6Al-4 V reinforced by TiB whiskers with AgCu filler. To induce SiC reinforcements to cluster together, within the center of the filler and especially away from the ZrB 2 -SiC, SiC was added into joint, in the form of a SiC interlayer featuring a 3D-bridged network structure with continuous micro-channels infiltrated by capillary force by liquid filler during brazing. Different SiC particles were connected together, by micro-bridges being not destroyed during brazing. The layer rich in SiC could reduce thermal expansion mismatch between different substrates, the AgCu next to the ZrB 2 -SiC could relax the strain energy by high plastic deformation. Compared to joint brazed with single AgCu, joint strain energy decreased from 10.8 × 10 −6 J to 8.6 × 10 −6 J, accordingly joint shear strength increased from ∼5.4 MPa to ∼41.2 MPa.
研究领域:
材料科学
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焊接工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2014
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IF 2.726
Chuandong Wu,Pan Fang,Guoqiang Luo,Fei Chen,Qiang Shen,Lianmeng Zhang,Enrique J. Lavernia
We report on a study on the influence of Plasma activated sintering (PAS) parameters on the microstructure and mechanical properties of aluminum matrix composites (AMCs). In this paper a commercial Al alloy (7075) reinforced with 7.5 wt.% B 4 C were synthesized using PAS. Specifically, we studied the influence of temperature, in the range of 450 °C to 540 °C, and holding time on the densification behavior of Al-7075/B 4 C composites. Moreover, the influence of residual porosity on mechanical properties of Al-7075/B 4 C composites was established via measurements of Vickers hardness, bending and compressive strength. High mechanical properties including Vickers hardness 181.6 HV, bending strength 1100.3 MPa, high compression yield strength 878.0 MPa and fracture strength 469.3 MPa of the consolidated Al-7075/B 4 C composite sintered at 530 °C for 3 min were achieved and attributed to a fully dense microstructure and a strong interface between matrix and reinforcement.
研究领域:
材料科学
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金属基复合材料
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粉末冶金
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固态加工
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力学性能表征
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
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2021
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IF 5.467
Fuxing Zhao,Jundong Zhu,Tangping Peng,Hao Liu,Shengzhuo Ge,Huasheng Xie,Le Xie,Chongwen Jiang
Excellent thermal insulating aerogels have broad application prospects in pipeline transportation, aerospace, construction and other fields. However, defects in thermal stability and mechanical are the main factors limiting their use to special environments. In this work, a novel polyimide composite aerogel is successfully synthesized through 3-Aminopropyltriethoxysilane (APTES) functionalized clay halloysite nanotubes (FHal) as inorganic enhancement phase and uniformly embedded in polyimide (PI) aerogels. Functionalization can increase the interfacial compatibility between clay inorganic phase and polyimide acid. The results indicated that FHal with high aspect ratio interacts with PI to form a three-dimensional network structure. The FHal/PI composite aerogels had low shrinkage (21.9%–30.79%), low bulk densities (65.285–71.464 mg/cm 3 ), low thermal conductivities (39.18–42.57 mW/(m·K)), high thermal stability (onset of decomposition above 520 °C) and excellent mechanical property (1.14 MPa, 2.62 times of pure PI aerogel). Therefore, FHal/PI composite aerogels can be used as a promising thermal management material for practical and complex insulation applications.
研究领域:
材料科学
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化学工程
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热管理
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复合材料
✓ 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）