MATERIALS CHARACTERIZATION
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2024
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IF 4.8
Shuai Ma,Di Dong,Mengyao Zhang,Ye Gao,Zhuangzhi Wu,Dezhi Wang
W-Re-HfC alloys have been extensively applied in the field of high-temperature structural parts. To ensure high temperature reliability, it is essential to enhance creep resistance ability. In this study, the microstructures of forged W-Re-HfC alloys were adjusted using different heat treatment processes . The corresponding tensile creep properties were also measured at 2000 °C with 40 MPa. Furthermore, a possible creep fracture mechanism was also explored. The forged W-Re-HfC sample annealed for 2 h exhibited the best creep performances with a steady-state creep rate of 3.28 × 10 −6 and a creep life of 5.6 h. Generally, a larger grain size indicates a lower steady-state creep rate; however, the precipitation of carbides at the grain boundaries (GBs) deteriorates the bonding strength of interfaces, thus reversing the former trend. The dominant creep mechanism is diffusion creep , in which the voids nucleate perpendicular to the GBs, grow and connect into cracks, ultimately leading to fractures.
研究领域:
材料科学
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金属学与热处理
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高温结构材料
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固态物理
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力学性能
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
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2024
·
IF 5.7
Wenhao Du,Fanhao Zeng,Yafang Gao,Ziwei Wang,Meiyan Chen,Zhi Li
Increasing the high-temperature anti-oxidation time of Carbon/carbon(C/C) composites faces significant challenges for conventional coatings. Herein, a unique bi-layer coating of HfC-TaC-B 4 C-SiC(HTBS)/ZrSiO 4 -glass(ZA) was proposed and prepared through slurry sintering method, and their oxidation behavior and mechanism were investigated. The results show that after oxidation at 1673 K in air for 750.5 h, the mass loss of the coated C/C was only 3.48% with about 720 h of weight gain oxidation, indicating that the anti-oxidation time has increased by two or three times compared to traditional coatings. The improved oxygen resistance performance was mainly attributed to the hinder layer of Si/Hf-Ta-Si-O during oxidation, which grew with the simultaneous carbothermal reduction reaction of SiO near matrix and oxidation reaction of HTBS. This is beneficial to lowering the thermal mismatch of coating system, reducing the connected thermal stress cracks as oxygen permeation channels. Our findings provide a new insight on improving the long-time thermal protection performance of C/C composites.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wanhong Yu,Guifang Li,Changwan Sun,Jianquan Zhang,Li Yang,Yichun Zhou
In this paper, we propose an effective method for doping WC into Ta-Hf-C ceramics to significantly enhance their densification and mechanical properties. An increasing WC doping amount from 0 to 20 at.%, enhances the densification of Ta-Hf-C ceramics from 92.4 % to 99.1 %. This is mainly due to the fact that the doping of WC effectively removes the harmful oxygen impurities from the ceramics, thereby increasing their sintering activity. Furthermore, the doping of WC plays an active role in the mechanical properties of the ceramics. The Ta-Hf-C doped with 15 at.% WC has the highest value of 36.41 GPa for nano-hardness due to the solid solution strengthening mechanism, while the highest Vickers hardness (38.75 GPa) and fracture toughness (3.76 MPa m 1/2 ) appear in Ta-Hf-C doped with 20 at.% WC. The main toughness mechanism is W segregation at the grain boundary, enhancing grain boundary strength .
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics B
·
2025
·
IF 1.5
Xiaoci Ma,Yutong Hou,Keyu Shi,Jiaqi Zhang,Gaoping Yue,Qiang Tao,Yufei Ge,Pinwen Zhu
Electrically conductive carbide ceramics with high hardness and fracture toughness are promising for advanced applications. However, enhancing both electrical conductivity and fracture toughness simultaneous is challenging. This study reports the synthesis of (Ti0.2W0.2Ta0.2Hf0.2Mo0.2)C-diamond composites with varying densities using high-pressure and high-temperature (HPHT) method. The carbides are uniformly dispersed in a titanium carbide matrix, forming conductive channels that reduce resistivity to 4.6×10-7 Ω·m. These composite materials exhibit metallic conductivity with a superconducting transition at 8.5 K. Superconducting behavior may result from d-p orbital hybridization and electron-phonon coupling in transition metal carbides, such as TaC, Mo2C, and MoC. Optimizing intergranular bonding improves the fracture toughness without compromising hardness. The highest indentation toughness value is 10.1 ± 0.4 MPa·m1/2, a 130 % increase compare to pure TiC. Enhanced toughness arises from transgranular and intergranular fracture modes, multiple crack bridging, and large- angle crack deflection, which dissipate fracture energy and inhibit crack propagation. This study introduces a novel microstructure engineering strategy for carbide ceramics to achieve superior mechanical and electrical properties.
研究领域:
材料科学
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固体力学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMPHYSCHEM
·
2025
·
IF 2.2
Jie Wang,Yubin Liu,Haikuo Lei,Wenbin Sun,Xiaoyu Huang,Yanli Ruan
Graphical A low-temperature localized high concentration electrolyte (LHCE) for lithium metal batteries is prepared using 2H,3H-decafluoropentane (HFC) as the diluent. The addition of the HFC diluent forms an anion-dominated solvation structure, enhances ion migration and desolvation kinetics at low temperatures, promotes the formation of an inorganic-rich solid electrolyte interface (SEI), and significantly improves the electrochemical performance of lithium metal batteries under low temperatures. A lithium-metal battery's electrochemical performance is affected by the kinetics of desolvation and ion transport at low temperatures. Here, we propose a low-temperature lithium-metal battery electrolyte. 1,2-Dimethoxyethane (DME) is used as the solvent, 2H,3H-decafluoropentane (HFC) as the diluent, and a high concentration of lithium bis(fluorosulfonyl)imide (LiFSI) as the solute. The addition of HFC diluent increases the number of anions bound to lithium ions and decreases the number of solvents in the solvation structure, which is conducive to the desolvation process at low temperatures. In addition, the anion-dominated solvation structure is conducive to the formation of an inorganic rich solid electrolyte interface (SEI), which effectively enhances the compatibility of LHCE-HFC electrolyte with lithium metal. The LHCE-HFC achieves ultra-high coulombic efficiency of lithium metal anode in Li||Cu batteries (99.31 %) and Li||Li batteries (1080 h) that have strong fluorine content in the interface. The Li||LiFePO 4 (LFP) cells provide a discharge-specific capacity of 92.1 mAh g −1 at 0.2 C at −20 °C and capacity retention of 89.6 % after 200 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
·
IF 3.582
Xue Li,Sining Yun,Chen Zhang,Wen Fang,Xinlei Huang,Tingting Du
Four types of nano-scale transition metal carbides (HfC, SiC, TiC, and WC), used as accelerants in anaerobic digestion (AD) with cattle manure, were investigated through batch experiments under mesophilic conditions (37 ± 1 °C). The AD system with four carbide accelerants showed a higher biogas yield (463–499 mL/g TS), chemical oxygen demand (COD) degradation rate (58.62–78.90%) and total Kjeldahl nitrogen (TKN) concentrations (905.0–1077.0 mg/L) as compared with control check (CK, 294 mL/g TS, 46.99%, 290 mg/L). All of the digestate samples from the AD systems using four carbide accelerants showed not only higher degradation of organic compounds during thermal analysis, but also stronger fertilizer values. The use of transition metal compounds (TMCs) as accelerants in AD can efficiently improve the conversion of waste resources into biogas and fertilizers, which can potentially open new avenues for the use of TMCs in upcoming research on biomass energy .
研究领域:
环境科学
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能源生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yan Ma,Haitao Wu,Qinglong Guo,Xingliang Dai,Peisan Wang,Wei Zhang,Dongdong Liu,Xulin Chen,Haisheng Qian,Xianwen Wang
Photothermal therapy (PTT) effectively suppresses tumor growth with high selectivity . Nevertheless, PTT may cause an inflammatory response that leads to tumor recurrence and treatment resistance, which are the main disadvantages of PTT. Herein, monodisperse hafnium carbide nanoparticles (HfC NPs) were successfully prepared for noninflammatory PTT of cancer. HfC NPs possessed satisfactory near-infrared (NIR) absorption, good photothermal conversion efficiency (PTCE, 36.8 %) and photothermal stability. Furthermore, holding large surface areas and intrinsic redox-active sites, HfC NPs exhibited excellent anti-inflammatory properties due to their antioxidant and superoxide dismutase (SOD) enzymatic activities . In vitro and in vivo experiments confirmed that HfC NPs converted light energy into heat energy upon NIR laser irradiation to kill cancer cells through PTT and achieved a better therapeutic effect by anti-inflammatory effects after PTT. This work highlights that multifunctional HfC NPs can be applied in noninflammatory PTT with outstanding safety and efficacy.
研究领域:
纳米技术
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癌症治疗
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光热疗法
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材料科学
·
生物医学工程
✓ 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）