Journal of Advanced Ceramics
·
2020
·Vol. 9
·期 3
·320-328
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IF 2.889
Yu Zhaoju,Yang Yujing,Mao Kangwei,Feng Yao,Wen Qingbo,Riedel Ralf
A novel single-source-precursor for SiC-TaC-C nanocomposites was successfully synthesized by the chemical reaction between a polycarbosilane (allylhydridopolycarbosilane, AHPCS) and tantalum(V) chloride (TaCl 5 ), which was confirmed by Fourier transform infrared spectra (FTIR) measurement. After pyrolysis of the resultant single-source-precursors at 900 °C, amorphous ceramic powders were obtained. The 900 °C ceramics were annealed at different temperatures in the range of 1200–1600 °C to gain SiC-TaC-C nanocomposites. The phase evolution of ceramic nanocomposites was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results indicate that the TaC starts to crystallize at lower temperature than the β-SiC. It is particularly worth pointing out that the unique core-shell structured TaC@C nanoparticles were in-situ formed and homogeneously distributed in the ceramic matrix after annealing at 1400 °C. Even at a high temperature of 1600 °C, the grain sizes of β-SiC and TaC are smaller than 30 nm, fulfilling the definition of nanocomposites. The present study related to SiC-TaC-C nanocomposites paves a new road for enriching ultra-high temperature ceramic family suitable for structural/functional applications in harsh environment.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Mingde Tong,Xinhao Shi,Tao Feng,Ying Dai,Pengfei He
To achieve the repeatability of aerospace thermal components, C/TaC‒SiC composites were fabricated. Cycle ablation and bending tests were carried out. After 3 × 60 s of ablation beyond 2100°C, the mechanical property retention rate was 80.9%. Interestingly, a reaction similar to “ouroboros ring,” in which the cyclic reactions of “TaC being oxidized to Ta 2 O 5 and Ta 2 O 5 being reduced to TaC,” occurred in the central ablation region of C/TaC‒SiC composites. On the one hand, the continuous generation of TaC could prevent liquid state Ta 2 O 5 from being blown off central ablation region, playing a similar role in “water and soil conservation.” On the other hand, liquid Ta 2 O 5 covered the surface of C/TaC‒SiC composites during ablation process, contributing to block the inward permeation of oxidized gases. In addition, novel “Grotto” structures were detected in the transitional ablation region of C/TaC‒SiC composites. The formation reason of the “Grotto” structure has also been discussed.
研究领域:
材料科学
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航空航天工程
✓ 已验证
DOI
高影响因子
International Journal of Metalcasting
·
2025
·
IF 2.5
Du Danfeng,Nie Xinfeng,Sun Chaowei,Liu Zexin,Guo Xiurong
Aluminum foam often collapses during the foaming process, adversely affecting its pore structure and resulting in suboptimal compression and energy absorption performance. To address this issue and enhance the mechanical properties of aluminum foam for broader applications in the automotive industry and other fields, this study developed an Al/TaC foam composite (AT-FC) using powder metallurgy. The composite incorporates tantalum carbide (TaC) as reinforcement particles, titanium powder as a combustion aid, titanium hydride as a foaming agent, and wood fiber as a space-holder material. The effects of varying TaC content on the pore structure and distribution of the aluminum foam composite were systematically investigated, alongside axial quasi-static compression tests. The results reveal that TaC content significantly influences the porosity and pore distribution of aluminum foam, while the inclusion of wood fiber as a spatial support material effectively prevents collapse. Compression tests showed that the mechanical properties were optimized with 10% TaC content, achieving a compressive strength of 10.223 MPa and an energy absorption capacity of 3.977 MJ/m 3 before reaching the densification strain. Graphical
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
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Zhuang Lu,Limeng Liu,Zhaoping Hou,Guihong Geng,Yujing Wang,Wenzhou Sun,Wanxiu Hai,Yuhong Chen
Tantalum carbide (TaC)-based composites containing 0.1–30 mol% lanthanum hexaboride (LaB 6 ) were prepared by hot pressing at 1900 °C for 30 min under 30 MPa pressure. Effects of LaB 6 content on densification, microstructure and mechanical properties of the consolidated TaC-LaB 6 composites were investigated. Sinter-forge was performed to test creep resistance of the TaC-LaB 6 composites at temperatures up to 1950 °C. Addition of LaB 6 increased densification of the TaC-LaB 6 composites and the compositions with ≥1 mol% LaB 6 almost reached full densities. LaB 6 reacted with TaC and the Ta 2 O 3 impurity to form minor phases of TaB 2 , B 2 O 3 and C. Average size of the TaC grains in the consolidated composites showed a decrease trend with increase in the LaB 6 content. The TaC-LaB 6 composites with 1–2 mol% LaB 6 addition had relatively good flexural strength , Vickers hardness and fracture toughness with a value of 530 MPa, 15.6 GPa and 5.29 MPa m 1/2 , respectively. Addition of LaB 6 modified interfacial bonding strength of the TaC grains, hence increase in creep resistance under sinter-forge up to 1950 °C.
研究领域:
材料科学
·
机械工程
·
陶瓷
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Zhuang Lu,Limeng Liu,Guihong Geng,Alexander M. Laptev,Zhaoping Hou,Yujin Wang
TaC ceramics with 0.03–0.60 wt% of boron additions were prepared by hot pressing at 2100 °C for 1 h under a pressure of 40 MPa. Effects of boron content on densification, phase composition, microstructure, mechanical properties and oxidation resistance of the TaC ceramics were investigated. When the boron content was 0.12 wt% and above, full density was obtained due to reactions between boron and oxygen impurity at presence of TaC. Minor phases of TaB 2 and C were formed in the 0.24 and 0.60 wt% B compositions after gas-out of the oxygen impurity. Microstructure of the TaC ceramics was refined with increasing in boron content. The TaC ceramic with 0.24 wt% of boron showed the best mechanical properties with a Vickers hardness , flexural strength and fracture toughness of 17.7 GPa, 534 MPa and 4.6 MPa m 1/2 , respectively. When more boron was added, interfacial bonding of the TaC grains was strengthened causing a decrease in fracture toughness. Oxidation resistance of the TaC ceramics increased with boron content. Particularly, the 0.60 wt% B composition showed a weight gain of 0.0018 g/cm 2 after oxidization at 800 °C in air for 3 h.
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
Results in Physics
·
2017
·
IF 0.946
Haihua Chen,Hao Liang,Lingxiao Liu,Huishan Li,Kui Liu,Fang Peng
The Vickers hardness of the bulk TaB and nano-TaC ceramics sintered at high pressure and high temperature were measured by using a diamond indentation method. Our tests gave a maximum Vickers hardness of 13.9 GPa for TaB, and 19.2 GPa for nano-TaC ceramics under a load of 29.4 N. The hardness of nano-TaC-5 wt% Co composites was also measured under the same load for comparison, which was found to be much lower than that of TaB and nano-TaC. The relative densities calculated by the Archimedes method are 13.5 g/cm 3 for TaB and 13.6 g/cm 3 for nano-TaC. The averaged fracture toughness is 6.8 ± 0.3 MPa m 1/2 for TaB and 5.0 ± 0.2 MPa m 1/2 for nano-TaC. Our results show that the hardness of the TaB may not be as high as previous reports.
研究领域:
材料科学
·
陶瓷学
·
凝聚态物理
·
高温材料
·
超硬材料
✓ 已验证
DOI
高影响因子
Heliyon
·
2024
·
IF 3.4
Ruisha Li,Keyin Zhang,Zhenjun Xu,Yanrong Yu,Dongjin Wang,Kai Li,Wenxue Liu,Jun Pan
Recent studies have underscored the cardioprotective properties of liraglutide. This research explores its impact on cardiac hypertrophy and heart failure following transverse aortic constriction (TAC). We found that liraglutide administration markedly ameliorated cardiac hypertrophy, fibrosis, and function. These benefits correlated with increased ANP expression and reduced activity in the calcineurin A/NFATc3 signaling pathway. Moreover, liraglutide mitigated ER stress and cardiomyocyte apoptosis, and enhanced autophagy. Notably, the positive effects of liraglutide diminished when co-administered with A71915, an ANP inhibitor, suggesting that ANP upregulation is critical to its cardioprotective mechanism.
研究领域:
心血管病学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Kai Zheng,Fanghai Lu,Qiong Long,Cuilian Shi,Xingli Zou,Zhanling Zhang,Xiaoling Zuo,Chaoyi Chen,Xiangdong Su
The direct electrolytic production of TaC nanoparticles from a Ta 2 O 5 /C precursor in molten CaCl 2 by using solid oxide membrane (SOM) technology was investigated in this work. A Ta 2 O 5 /C pellet pressed under 6 MPa was used as the cathode, and a yttria-stabilized zirconia (YSZ) tube filled with carbon-saturated liquid tin served as the anode to control the electrolysis process. The phase composition and morphology characteristics of the electrolysis products were investigated. The results show that TaC nanoparticles could be obtained directly from a Ta 2 O 5 /C mixture in molten CaCl 2 at 1000 °C and 4.0 V within 4 h.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Limeng Liu,Jozef Vleugels,Shuigen Huang,Jie Wei,Yujin Wang
TaC ceramics with 0-0.237 wt% B addition were prepared by hot pressing. The effect of B addition on the phase constitution, interfacial chemistry/bonding and mechanical properties of the TaC ceramics were investigated. Upon B addition, the elimination of O impurity and segregation of B at grain boundaries were evidenced, accompanied by an increase in bonding strength of the TaC grains, to result in a fracture mode change from intergranular to transgranular and a reduced fracture toughness. Addition of excessive B resulted in the formation of TaB 2 and C within TaC ceramics. Further, TaC-TaB 2 -SiC composites were prepared by Si addition. Coherent bonding between TaB 2 and TaC was preserved in the TaC-TaB 2 -SiC composites, and residual stresses due to thermal expansion mismatch of the different phases increased flexural strength and fracture toughness of the composites.
研究领域:
材料科学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Ruxia Liu,Wei Zhao,Ye Tian,Jian Zhang,Guoqiang Luo,Qiang Shen
TaC enhancement particles and Re alloy were used to improve the strength and ductility of the tungsten alloy. The synergetic effect of TaC addition and Re alloying on relative density, microstructure, and mechanical properties of tungsten alloy were investigated. The results indicated that a W-based composite with 2.5 wt% TaC addition and 25 wt% Re alloying exhibited yield stress of 1.23 GPa, the ultimate compressive stress of 2.86 GPa, bending strength of 1.30 GPa and strain capacity of 42 %, which was increased by 114 %, 140 %, 226 %, and 133 % than those of pure W. Further analysis revealed that the grain boundary purification, grain refinement, and kinematic strain gradient contribution because of the addition of TaC, lattice distortion, and the generation of dislocations because of the addition of Re alloying are the main strengthening mechanisms in W–TaC-Re composite.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yanzi Tang,Jincui Ren,Weixiang Yang,Yunuo Yang
TaC whiskers were prepared using the molten salt method with Ta 2 O 5 , activated carbon, NaCl/NaF, and nano Ni powders as raw materials. The study examined the effects of the ratios of these raw materials, reaction temperature, and reaction time on the phase composition and microstructure of the TaC whiskers, as well as their growth mechanisms. The results indicated that production and length-diameter ratio of the TaC whiskers initially increased with higher carbon content until a certain point, after which they began to decrease. The prepared TaC whiskers using NaCl as molten salt were acicular and had a low length-diameter ratio. The TaC whiskers prepared by NaF were quadrangular prism-shaped and had a high ratio of length to diameter. Insufficient molten salt resulted in poor diffusion and uneven distribution of the reactants, while an excessive amount led to increased whisker diameters and agglomeration of the TaC whiskers. When the content of Ni was low, there were not enough nucleation points for whisker growth, resulting in only a small quantity of TaC whiskers. Conversely, a high Ni concentration caused a decrease in the length-to-diameter ratio of the whiskers. As reaction temperature rose, both the production and length-diameter ratio of the TaC whiskers first rose and then fell. Prolonging reaction time could increase production and length-diameter ratio of the TaC whiskers. When the molar ratio of Ta:C:F:Ni was 1:4:1:25:0.10, with a reaction temperature of 1300 °C and a reaction time of 2 h, the TaC whiskers exhibited the highest production, purity and length-to-diameter ratio. These whiskers had with an average diameter of 0.8 μm and lengths spanning several microns. The TaC whiskers had a single crystal structure, with their growth direction aligned along the [001] crystal direction. The growth mechanisms of the TaC whiskers were controlled by both the vapor-liquid-solid and solid-liquid-solid mechanisms.
研究领域:
材料科学
·
晶体生长
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2018
·
IF 2.606
Zhuang Lu,Limeng Liu,Zhaoping Hou,Biao Zhang,Guihong Geng,Yujin Wang,Feng Ye
TaC-Al 2 O 3 composites were prepared by hot pressing. Influence of Al 2 O 3 content ranging from 10 to 40 vol. % on densification, phase composition, microstructure, mechanical properties and oxidation behavior of the TaC-Al 2 O 3 composites was investigated. With 30 and 40 vol. % Al 2 O 3 addition a closed porosity was achieved. The Al 2 O 3 particles were uniformly distributed among TaC grains retarding grain growth and resulting in refined microstructures with grains below 2 μm in size. The most densified composite with 40 vol. % Al 2 O 3 addition exhibited good mechanical properties with a Vickers’ hardness of 17.8 GPa, a flexural strength of 485 MPa and a fracture toughness of 5.4 MPa·m 1/2 . After holding at 700°C for 3 h in air, the dense 30 and 40 vol. % Al 2 O 3 compositions showed hardly noticeable and mainly surface oxidation, whereas less densified TaC-Al 2 O 3 composites with 10 and 20 vol. % Al 2 O 3 content and with open porosity were disintegrated to powders.
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
危险品化学品经营许可证（带存储）