TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2022
·
IF 3.752
Zhao-wang DONG,Yang XIA,Xue-yi GUO,Qing-hua TIAN,Han-ning LIU,Pei-dong LIU,Yu-bing CHEN
A direct production method of high-strength titanium alloy from upgraded titania slag (UGS) was developed. First, UGS was reduced into alloy powder with 1.3 wt.% oxygen using magnesium powder. Subsequently, the alloy powder was compacted at 600 MPa to produce a pellet. Lastly, the pellet was sintered to produce titanium alloy. The reduced powder was characterized, and the effect arising from the sintering temperature on the sintered density, compressive strength, microstructure, and hardness of the alloys was studied. The results showed that the density tended to increase with the temperature increasing from 900 to 1200 °C, whereas the porosity decreased. A significant sintering densification was achieved at the temperature above 1100 °C (98.65% at 1100 °C and 99.41% at 1200 °C). At 1100 °C, the hardness and compressive strength reached the maximal values of the alloy, HV 655.7 and 1563 MPa, respectively.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2017
·Vol. 4
·期 10
·1700008
·
IF 9.034
Xin Yao,Junhui Liang,Yuelong Li,Jingshan Luo,Biao Shi,Changchun Wei,Dekun Zhang,Baozhang Li,Yi Ding,Ying Zhao,Xiaodan Zhang
Intensive studies on low-temperature deposited electron transport materials have been performed to improve the efficiency of n-i-p type planar perovskite solar cells to extend their application on plastic and multijunction device architectures. Here, a TiO 2 film with enhanced conductivity and tailored band edge is prepared by magnetron sputtering at room temperature by hydrogen doping (HTO), which accelerates the electron extraction from perovskite photoabsorber and reduces charge transfer resistance, resulting in an improved short circuit current density and fill factor. The HTO film with upward shifted Fermi level guarantees a smaller loss on V OC and facilitates the growth of high-quality absorber with much larger grains and more uniform size, leading to devices with negligible hysteresis. In comparison with the pristine TiO 2 prepared without hydrogen doping, the HTO-based device exhibits a substantial performance enhancement leading to an efficiency of 19.30% and more stabilized photovoltaic performance maintaining 93% of its initial value after 300 min continuous illumination in the glove box. These properties permit the room-temperature magnetron sputtered HTO film as a promising electron transport material for flexible and tandem perovskite solar cell in the future.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Yating Huang,Qi Li,Shuai Wang,Zhenfei Cai,Yangzhou Ma,Guangsheng Song,Weidong Yang,Cuie Wen,Yingchun Xie
As a promising anode material for the next generation of lithium-ion batteries, silicon (Si) suffers from the main problems of severe volume expansion and poor electrical conductivity. Compounding Si-based materials with metal hydrides is one of the ways to overcome these problems. Herein, we proposed TiH 2 decorated Si composites prepared by ball milling and subsequent high-temperature calcination to restrain the volume expansion of Si and enhance the electrical conductivity. The resulting Si-0.05TiH 2 anode delivered a reversible discharge capacity of 766.1 mAh/g after 100 cycles at a current density of 100 mA/g and better rate capability than the Si anode. Additionally, the impedance measurements and the density functional theory (DFT) calculation demonstrated that the insertion of Ti after dehydrogenation of TiH 2 enhanced the conductivity of the composite anode. The charge transfer resistance (R ct ) of Si-0.05TiH 2 and Si anodes were 43.03 Ω and 609.6 Ω, respectively, indicated that the charge transfer process of Si/TiH 2 electrodes was faster. This study provides a new strategy for compounding metal hydrides with Si, and a further attempt to enhance the electrochemical properties of Si.
研究领域:
材料科学
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电化学
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能源存储
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纳米材料
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固态物理
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhuanghe Ren,Xin Zhang,Zhenguo Huang,Jianjiang Hu,Yangzhong Li,Shiyou Zheng,Mingxia Gao,Hongge Pan,Yongfeng Liu
Nanosized titanium compounds are particularly effective in catalyzing hydrogen cycling by NaAlH 4 . Titanium hydride (TiH 2 ), as a catalyst, is highly interesting since it contributes hydrogen in addition to active Ti. However, it has been challenging to fabricate nanosized TiH 2 due to the strong affinity of Ti with oxygen. Herein, TiH 2 nanoflakes with a lateral size of ~10 nm and thickness of ~1 nm are successfully synthesized through a novel facile one-pot solvothermal process. In an anhydrous THF solution, LiH reacts with TiCl 4 rapidly at 100 °C forming TiH 2 and LiCl. The newly formed TiH 2 nucleates and grows epitaxially on the graphene surface due to the well-matched lattice parameters, giving rise to the formation of TiH 2 nanoflakes. Both theoretical calculations and experiments reveal the generation of Cl· radicals and unsaturated C C bonds when TiCl 4 reacts with THF, which promotes the formation of TiH 2 . The nanoflake-like TiH 2 on graphene enables an outstanding hydrogen storage performance of NaAlH 4 , i.e., full dehydrogenation at 80 °C and hydrogenation at 30 °C and under 100 bar H 2 , with a practical hydrogen capacity of 4.9 wt%, which has been never reported before.
研究领域:
材料科学
·
纳米化学
·
能源化学
·
固态储氢
·
催化化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yingjie Shi,Weixing Li,Xiaorong Zhang,Wenjie Yang,Jingbo Mu,Yu Dong,Hongwei Che,Yanming Wang,Yafeng Wang,Zhixiao Zhang
Core–shell structural B 4 C@TiB 2 composite powders were synthesized via the molten salt method using micron-sized B 4 C and TiH 2 powders as raw materials. Furthermore, a SiC composite ceramic with B 4 C@TiB 2 core–shell structural units as the toughening phase was prepared by spark plasma sintering using SiC powder and the obtained B 4 C@TiB 2 composite powder as starting powders. The effects of calcination temperature and raw material ratio on the phase compositions and microstructure of the B 4 C@TiB 2 composite powders were studied, and the synthesis mechanism of the B 4 C@TiB 2 composite powder was explored. The formation mechanism of B 4 C@TiB 2 core–shell toughening units inside the SiC matrix was investigated, and the toughening mechanism of the SiC–B 4 C@TiB 2 composite ceramic was discussed. Results show that the B 4 C@TiB 2 core–shell units in the SiC matrix can induce a complex crack propagation mode and consume abundant crack propagation energy. Therefore, a high fracture toughness of 6.47 ± 0.32 MPa m 1/2 is realized for the SiC–B 4 C@TiB 2 composite ceramics.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 10
·6911-6920
·
IF 3.5
Ruixue Bai,Mian Li,Lingyan Feng,Qing Huang
The family of MAX phases and their two-dimensional derivative MXenes attract significant attention due to their unparalleled properties. Synthesis of MAX phases and MXene from biomass sources is important to expand their biology-related applications, while it remains a challenge. The present work explores the possibility to synthesize MAX phases and subsequently derive MXenes by using biomass precursor. Ti 3 AlC 2 MAX phase was synthesized by using glucose as the carbon source in molten salt. The conversion behavior from glucose to Ti 3 AlC 2 was investigated, and the conversion rate of carbon from glucose reached to 70.4% by optimizing the reaction conditions. The as-obtained Ti 3 AlC 2 can be derived into Ti 3 C 2 T x MXene and MXene quantum dots by common chemical treatments, which provides possibility for biomass-derived nanolaminates applying in biological applications such as biological catalysis, bioinstrumentation, and biological tracking.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2024
·
IF 4.2
Dezhi Wang,Ningyuan Xing,Kai Li,Ye Gao,Yanzhen Lu,Zhuangzhi Wu
To meet the high demand of tungsten alloy matrix wires for photovoltaic slicing, new high performance tungsten composites are explored and the effect of various Ti-based additives on the mechanical properties of tungsten is systematically discussed as well as the corresponding strength improvement mechanism. It is found that the W-TiB 2 exhibits the best mechanical properties with an ultimate tensile strength of 292.3 MPa and a compressive strength of 2370 MPa (a strain of 35%), approximately 96.1% and 28.5% higher than those of pure tungsten, respectively. Besides, the TiB 2 additive also triggers a slight toughening with a transgranular fracture . The enhanced strength should be attributed to the reaction between TiB 2 and adsorbed/dissolved oxygen, in which a new second phase of TiO 2 is generated with a small amount of Ti elements solidly dissolved into the W matrix, resulting in enhanced binding ability among grain boundaries and distorted lattices.
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 SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2024
·
IF 6.1
Siran Wang,Kunming Yang,Mingrui Xie,Junwei Sha,Xudong Yang,Naiqin Zhao
The incorporation of nano carbon reinforcement is a useful strategy to broaden the engineering applications of metal foams . In this work, carbon nanotubes (CNTs) reinforced aluminum (Al) matrix composite foams (CNTs/Al composite foams) with different CNTs content are prepared by combining ball-milling technique with powder metallurgy method. The result shows that the appropriate content of CNTs can reduce the pore size, improve the circularity, and enhance the compressive properties. Especially, the 1.0 wt% CNTs/Al composite foams possess the optimal compressive properties of yield stress (7.90 MPa), plateau stress (8.75 MPa) and energy absorption capacity (5.19 MJ/m 3 ), which have an enhancement of 23.24%, 98.41% and 84.70%, respectively. Composite foams undergo shear deformation throughout the quasi-static compression process, and the failure mode performs as the brittle mode combined with ductile mode. Meanwhile, the incorporation of CNTs can contribute to the inhomogeneous distribution of the Si phase, provide more nucleation sites, and significantly refine the pore size. It is confirmed that the CNTs in composite foams contribute the grain refinement and the formation of micro stacking faults, making the mechanical properties of CNTs/Al composite foams outperform the counterpart of Al-Si foams. Moreover, due to the weak interfacial reaction, the low content of aluminum carbide is formed, which can promote the load transfer between CNTs and Al. The present finding provides a theoretical and practical design strategy to the future preparation of CNTs/Al composite foams.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Liangliang Tang,Dongxu Yao,Yongfeng Xia,Jun Zhao,Ming Zhu,Yu-Ping Zeng
Gas-pressure-sintered silicon nitride (Si 3 N 4 ) ceramics were increased in density and mechanical properties without impairing the thermal conductivity by the addition of TiH 2 . After annealing treatment of the sintered ceramics, the inherent properties were further improved, the grain boundary phases on the surface were evaporated, and the rugged surface microstructure was formed. Si 3 N 4 ceramics before and after the annealing treatment were then joined with oxygen-free copper (OFC) foil using Ag-Cu-TiH 2 filler. Two interfacial structures, planar and rugged, were formed in the Si 3 N 4 ceramic/OFC foil joints, respectively. The peeling strength of the joints brazed with annealed Si 3 N 4 ceramics was improved, attributed to the increased inherent strength of the ceramics and rugged interface of the joints. The joint reached a maximum peeling strength of 25.08 N/mm, in which the fracture occurred mainly in the surface layer of the Si 3 N 4 ceramic as well as between the brazing alloy and the OFC foil.
研究领域:
材料科学
·
焊接工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Penglin Kang,Changgui Song,Jinbo Guo,Yuan Lai,Xiangru Li,Leixin Hou,Wenjie Liu,Xiaodong Li
To achieve a synergistic enhancement of both energy output and safety performance in metal powder-based high-energy materials, this study employed coaxial focusing droplet technology to fabricate HMX/TiH 2 /F composite microspheres. The influence of dispersed phase concentration on microsphere morphology and particle size was systematically investigated. HMX/F and HMX/Ti/F microspheres, prepared using the same method, served as control groups for analyzing crystal structure and functional group composition. Results indicated that all three types of microspheres retained their original chemical structures. Performance tests revealed that HMX/TiH 2 /F microspheres achieved a favorable balance between thermal stability and reactivity, with thermal safety significantly improved compared to the control samples. Specifically, its impact sensitivity increased by 8 J and 13 J compared to HMX/F and HMX/Ti/F, respectively; friction sensitivity increased by 164 N and 228 N; and electrostatic accumulation was reduced by 1.46 and 16.40 nC, respectively, demonstrating superior mechanical and electrostatic safety. Combustion and detonation tests further demonstrated that HMX/TiH 2 /F microspheres exhibited the most intense combustion flame. The ignition delay time was reduced by 67.48 ms and 26.20 ms compared to HMX/F and HMX/Ti/F, respectively, and the combustion duration was shortened by 0.51 s and 0.42 s. Meanwhile, HMX/TiH 2 /F composite microspheres still maintained a high energy output, and the measured detonation velocity was 7685.7 m/s, which was 149.99 m/s higher than that of HMX/Ti/F. These findings indicate that the incorporation of TiH 2 facilitates the coordinated optimization of high-energy materials with respect to both safety and energetic performance, demonstrating promising application potential.
研究领域:
材料科学
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含能材料
·
热力学
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燃烧学
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安全工程
·
颗粒工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Leyao Xiong,Gaoming Mo,Ke Chen,Qing Huang
Ti 3 SiC 2 is a representative MAX phase that uniquely combines the merits of metals and ceramics. However, polymer-derived Ti 3 SiC 2 has been less extensively studied, especially in terms of its reaction mechanism and structural evolution. In this study, Ti 3 SiC 2 is synthesized by pressureless pyrolysis of PCS and TiH 2 , the structural evolution and chemical reactions occurring during the organic-inorganic conversion and synthesis process are investigated. The results show that Ti 3 SiC 2 with a mass fraction of 79.2 % can be achieved by pressureless pyrolysis of PCS and TiH 2 powders, with a Ti-to-Si atomic ratio of 3:1.7, at 1350 ℃. The presence of TiH 2 enhances the ceramic yield of PCS at 1000 ℃ compared to pure PCS, as some branched and crosslinking structures form between 100 ℃ and 300 ℃. By 800 ℃, the organic-inorganic conversion of PCS and the decomposition of TiH 2 are complete, resulting in the formation of amorphous SiC, free C and porous Ti. Concurrently, some SiC may transform into amorphous Si and C in the presence of porous Ti. At 1000 ℃, T 5 Si 3 forms within the porous Ti matrix, while TiC is generated on the periphery. Between 1200℃ and 1350 ℃, a reaction between these two phases and free C leads to the synthesis of Ti 3 SiC 2 . The formed Ti 3 SiC 2 phase begins to decompose at 1450 ℃ and completely breaks down into TiC, SiC, and TiSi 2 at 1600 ℃.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
·
2024
·Vol. 47
·期 8
·2905-2921
·
IF 3.1
Siran Wang,Zhangcheng Yin,Xudong Rong,Haipeng Song,Xudong Yang,Naiqin Zhao
The unsatisfactory fatigue performance of Al foams significantly limits their engineering applications. Meanwhile, the unique pore structure of metal foams makes it still challenging to assess its fatigue. Herein, we report an innovative strategy for preparing carbon nanotubes reinforced Al-Cu-Mg (CNTs/Al-Cu-Mg) composite foams, which exhibit superior compressive strength (16.17 MPa) and fatigue strength (11.17 MPa). Statistics analysis confirms that the fatigue life ( N f ) follows Weibull distribution, and P-S-N curves were obtained to calculate the theoretical stress level required to achieve the expected N f . Moreover, computer vision is utilized to monitor the fatigue deformation process and effectively detect fatigue crack initiation sites. Notably, the accuracy of predicted N f obtained by this method is exceptionally high (98.32%). This work provides a theoretical and practical basis for designing metal foams with superior fatigue properties and offers a promising bottom-up tactic for predicting the N f of metal foams to prevent fatigue failure. Highlights The CNTs/Al-Cu-Mg composite foams possess the superior fatigue strength of 11.17 MPa. The application of computer vision enables the accurate monitoring of FCIS. A novel exploration into the fatigue assessment of metal foams is developed.
研究领域:
材料科学
·
工程学
✓ 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）