Materials
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2020
·Vol. 13
·期 23
·5356
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IF 3.057
Weihua Chen,Jiancheng Tang,Xinghao Lin,Yunlong Ai,Nan Ye
In the present study, high-purity ternary-phase nitride (Ti2AlN) powders were synthesized through microwave sintering using TiH2, Al, and TiN powders as raw materials. X-ray diffraction (XRD), differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were adopted to characterize the as-prepared powders. It was found that the Ti2AlN powder prepared by the microwave sintering of the 1TiH2/1.15Al/1TiN mixture at 1250 °C for 30 min manifested great purity (96.68%) with uniform grain size distribution. The formation mechanism of Ti2AlN occurred in four stages. The solid-phase reaction of Ti/Al and Ti/TiN took place below the melting point of aluminum and formed Ti2Al and TiN0.5phases, which were the main intermediates in Ti2AlN formation. Therefore, the present work puts forward a favorable method for the preparation of high-purity Ti2AlN powders.Keywords:MAX-phase Ti2AlN;microwave;synthesis;high-purity powder
研究领域:
材料科学
·
化学工程
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DOI
PubMed
高影响因子
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
·
2018
·Vol. 126
·期 11
·900-905
·
IF 0.887
Shuai LU,Xiaoqiang LI,Youfu ZHOU,Wentao XU,Junrong LING,Wei PAN
TiB2/Ti2AlN composites with different proportions were successfully fabricated through solid state reaction of Ti/Al/AlN/BN powders and subsequent hot pressing sintering. The reaction mechanism, microstructures and mechanical properties of the composites were investigated. The Vickers hardness of the samples ascended with increases in the TiB2 content and reached the highest value of 11.32 ± 0.12 GPa at a TiB2/Ti2AlN mole ratio of 1:2 (M2T1). TiB2/Ti2AlN composites with a mole ratio of 1:3 (M3T1) and 1:4 (M4T1) exhibited the maximum flexural strength of 497 ± 15 MPa and the highest fracture toughness of 9.52 ± 0.14 MPa·m1/2, respectively, which are 1.3 times and 1.8 times that of pure Ti2AlN (MT0) ceramic.
研究领域:
材料科学
·
机械工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zonglong Gao,Zhuan Li,Guoyuan Wen,Jiaqi Wu,Ye Li,Hongying Nie,Mengting Wei
In braking materials field, MAX phase has been introduced into Cu-based composite materials to address issues such as inadequate wetting between ceramic particles and the metal matrix. This study focuses on preparing Ti 2 AlN-ZrO 2 -B 4 C reinforced Cu-based materials via the powder metallurgy method, and investigates the effects and mechanisms of different Ti 2 AlN/ZrO 2 ratios on the mechanical, thermal, and tribological properties of these materials. The addition of an appropriate amount of Ti 2 AlN (3 wt%) can enhance the densification and mechanical properties of Cu-based materials, as the diffusion of Al atoms promotes the sintering process. Similarly, the diffusion of Al also improves the thermal conductivity at grain boundaries, resulting in samples with higher Ti 2 AlN content exhibiting superior thermal diffusivity. When the Ti 2 AlN content reached 7 wt%, the material exhibited optimal hardness (43.35 ± 1.05 HBW), moderate shear strength (19.84 ± 1.86 MPa), as well as excellent high initial braking speed friction coefficient and stability. The reinforcement primarily arises from the diffusion bonding between Ti 2 AlN and Cu, leading to the formation of Cu-Ti compounds at the interface, which facilitates Ti 2 AlN in providing frictional force during the friction process and promotes the formation of a friction film due to the “pinning effect”. Additionally, the layered structure of Ti 2 AlN and the subsequent formation of amorphous Al 2 O 3 after oxidation contributed to the enhancement of friction stability.
研究领域:
材料科学
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机械工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
·
IF 5.302
Zetan Liu,Jingkun Xu,Xiaoqing Xi,Ji Zhou
Ti 2 AlN powders were synthesized through molten salt method and re-calcination process using TiH 2 , Al and TiN powders as raw materials at 1100 ℃. The composition of final composite was directly influenced by the initial Al and TiH 2 content in the starting mixture. The purity of the synthesized Ti 2 AlN powder could reach 97.1 wt% when the Al molar ratio was 1.05. Then high strength Ti 2 AlN ceramics were successfully prepared in different modes, including two forms of pulse electric current sintering (PECS/SPS) and hot-pressing sintering (HP). A record-high flexural strength of 719 MPa was obtained for the PECS/SPS with an electrical insulating die (PECS/SPS II) sintered sample, based on the synthesized powder in which the initial molar ratio of Al was 1.1. The sintering behaviors in various modes were analyzed, confirming the shrinkage of particles starting at lower temperature in PECS/SPS II. The density, microstructure, Vickers hardness and elastic modulus of sintered ceramics were also investigated. Therefore, the present work provided the new methods about powder preparation and ceramic sintering of Ti 2 AlN, making it possible to be used as high strength structural ceramics .
研究领域:
材料科学
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陶瓷工程
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粉末冶金
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DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
·
IF 6.76
Zhimin Xu,Yingxin Zhang,Huanyan Dai,Yu Wang,Yujie Ma,Shuang Tan,Bing Han
Obtaining a safe and reliable scaffold that can be rapidly fabricated and used for clinical bone defect repair has always been a challenge. In this study, polycaprolactone (PCL) composite scaffolds with various MXene (Ti 2 AlN) contents were prepared using 3D printing technology. The effects of different contents of Ti 2 AlN on the mechanical properties, hydrophilicity, cytocompatibility, and osteogenic differentiation ability were systematically studied and analysed. In vitro experiments showed that scaffolds containing 5% Ti 2 AlN ( [email protected] #Ti 2 AlN) obtained the best cell adhesion and proliferation ability and significantly upregulated the alkaline phosphatase (ALP) level. In vivo experiments of tibial defect repair in rats showed that the PCL scaffold containing 5% Ti 2 AlN ( [email protected] #Ti 2 AlN) could significantly promote the formation of new bone, and the experimental results of rabbit maxillofacial bone defect repair further proved that the [email protected] #Ti 2 AlN scaffold could effectively promote the repair of bone defects. Transcriptome analysis indicated that Ti 2 AlN may promote osteogenic differentiation by the Wnt/β-catenin signaling pathway and calcium-binding proteins. These findings suggest that Ti 2 AlN/PCL composite scaffolds with improved in situ bone repair ability represent an intelligent strategy for bone defect repair.
研究领域:
生物医学工程
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材料科学
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组织工程
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骨科
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DOI
高影响因子
Journal of Advanced Dielectrics
·
2019
·
IF 0
Muhammad Faraz Ud Din,Chenhui Yang,Yi Tang,Yapeng Tian,Yangyang Luo,Yutao Wu,Wenxiu Que
Nitrides MAX have attracted ever-growing interest owing to its unique metallic and ceramic characteristics and properties. Here, we report on the synthesis of highly purified Ti 2 AlN and Ti 4 AlN 3 powders from Ti, Al and TiN powders by a facile atmosphere sintering method. The obtained nitrides show highly pure phase and excellent layered structure. Except for the composition difference of raw materials, both the nitrides can be sintered and obtained by same sintering temperature and holding time, which thus makes less processing time and less usage of synthesis parameters as compared to previously synthesis methods. To our knowledge, present work is one of the few reports on synthesis of Ti 4 AlN 3 and Ti 2 AlN using atmosphere sintering method. Furthermore, the lattice changes of the layered structure of Ti 2 Al X ( X = C ∕ N ) were studied by changing the composition of X position from the synthesis of Ti 2 AlCN and Ti 2 AlC, and the optimal formulation and synthesis mechanism of Ti 4 AlN 3 were also studied.
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DOI
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Chen Jin,Lingfeng Wang,Zhenke Chen,Hang Che,Shuzhong Wang,Zhiheng Liu,Tao Chen,Li Wang,Yuyuan Zhao,Xinhua Wang,Haoyuan Zheng,Haizhen Liu,Mi Yan
This study presents the preparation of a partially etched Ti 2 AlN-derived composite with a combination of Ti 2 N, residual Ti 2 AlN, and in-situ TiN nanoparticles. The resultant two-dimensional ternary composite was used as a catalyst to enhance the hydrogen storage capacity of NaAlH 4 .Although NaAlH 4 possesses a high theoretical hydrogen storage capacity of 7.4 wt%, its practical application is plagued by several problems: high temperature (~180 °C) to release hydrogen, slow kinetics, and poor reversibility. Herein, Ti 2 N was prepared by etching the Ti 2 AlN MAX phase. The results show that the catalytic effect is optimal when the Ti 2 N content is 7.5 wt%, with the starting temperatures of the two-step hydrogen release from NaAlH₄ decreasing from 180 °C and 260 °C to 98.4 °C and 163.3 °C, respectively. Meanwhile, the apparent activation energies of the two-step reactions decrease from 128 kJ/mol and 160 kJ/mol to 66.0 kJ/mol and 91.6 kJ/mol, respectively, with the kinetic performance significantly improved. Importantly, Ti 2 N/NaAlH 4 composites retain more than 95% of their hydrogen storage capacity after 10 cycles. Detailed characterizations using XRD, XPS, and TEM disclosed that the coexistence of multi-phases in Ti 2 N/NaAlH 4 composites induces synergistic catalytic effects: stable Ti 2 AlN provides electrically conductive pathways, while the reversible phase transformation between TiAl and TiAlH x occurs at the interface and nano-sized TiN transformed into TiAl 3 , enabling improved hydrogen gas dissociation. Collectively, these results provide new fundamental insights into optimizing the properties of Ti 2 N MXenes as catalysts in complex hydride hydrogen storage materials and establish key design principles to inspire the development of various composite materials for efficient and practical solid-state hydrogen storage systems.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Helong Zhang,Chuxiong Qiu,Rong Zhang,Hao Zhang,Yunxia Chen,Tao Zeng,Fen Qiao,Lee Li,Ghafar Ali,Xiujian Zhao,Yi Xie
We develop layered MAX (e.g., Ti 3 AlC 2 , Ti 3 AlCN, Ti 2 AlC, Ti 2 AlN) into novel photothermal silica-deposited MAX (MAX@SiO 2 ) composites and coatings for efficient seawater desalination and anti-/de-icing, by combining their strong optical absorbance capacity covering UV-Vis-NIR regions with unique surface wettability. The water evaporator with a unique gradient superhydrophilicity-hydrophilicity-hydrophobicity-superhydrophobicity is achieved by incorporating the as-synthesized hydroxyl- and methyl-modified MAX@SiO 2 composites into porous melamine foam (MF). By combining the unique gradient wettability with porous structure and strong optical absorbance, the proposed MAX@SiO 2 evaporator displays excellent seawater desalination performance with high water evaporation rates of ∼2.19 and 3.45 kg m −2 h −1 under 1.0 and 2.0 sun irradiation, respectively. The photothermal water evaporation efficiency can reach to 91.2 % under 1.0 sun illumination. Besides, by sequential spray-depositing resin-based primer and MAX@SiO 2 top-coat on glass slides and insulators, the as-achieved superhydrophobic (SH) photothermal coatings displayed excellent anti-icing and de-icing performances. The procedures described here enable a convenient and novel strategy to develop micro-nanocomposites and multifunctional coatings with strong photothermal conversion ability, which would shed light on promising potentials in energy conversion and photo-thermal applications including solar freshwater generation, sewage purification, and anti-/de-icing.
研究领域:
材料科学
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环境工程
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能源转换
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光热应用
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）