CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yunlong Liu,Degui Zhu,Salvatore Grasso,Chunfeng Hu
Dense Ti 3 AlC 2 components with a complex shape were fabricated using gel casting followed by pressure-less sintering. Low viscosity slurry was prepared using an aqueous based acrylamide (AM) monomer with a 50% solid loading. Homogeneous and crack free Ti 3 AlC 2 green bodies were obtained. The sintering temperatures were set at 1500, 1550 and 1600 °C, highest relative density of 93% was achieved at 1550 °C. Surprisingly, samples sintered at 1600 °C resulted in a drop of relative density because of the abnormal grain growth and entrapped porosity. The pressure-less sintered samples had mechanical properties comparable to hot pressed counterparts with Vickers hardness of 3.1 ± 0.2 GPa, fracture toughness of 4.2 ± 0.2 MPa m 1/2 and flexural strength of 302.3 ± 25.0 MPa. Final machining was still required to obtain a net shape components free from surface defects .
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Zhihua Liu,Dan Han,Lulu Liu,Donghui Li,Xiaomei Han,Yi Chen,Xiaoru Liu,Kai Zhuo,Yongqiang Cheng,Shengbo Sang
Two-dimensional (2D) transition metal carbides (MXene) have attracted great attention for device applications due to their unique structures and excellent properties, such as high electrical conductivity and abundant functional groups on the surface. However, gas sensors based on Ti 3 C 2 T x MXene have the problems of high detection limit and poor long-term stability. Herein, we report a simple method to prepare Ti 3 C 2 T x /Ti 3 AlC 2 planar composite gas sensing materials using high molar ratio of HCl and LiF with Ti 3 AlC 2 as a framework. The Ti 3 C 2 T x /Ti 3 AlC 2 planar composite gas sensor has a high sensitivity, good selectivity and low detection limit for NH 3 , which can detect 50 ppb (1.2%) at room temperature ((25 ± 2) ℃). Furthermore, the gas sensor has good repeatability and long-term stability. After 120 days, the response of the gas sensor to 500 ppb of NH 3 fluctuated little due to the Ti 3 AlC 2 as a framework. The superior performances can be attributed to the special heterojunction between Ti 3 C 2 T x and Ti 3 AlC 2 and the high proportion of -O and -OH functional groups on the surface of Ti 3 C 2 T x /Ti 3 AlC 2 composite. This study provides an important reference for the realization of high performance NH 3 sensing by Ti 3 C 2 T x .
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
JOM
·
2020
·Vol. 72
·期 11
·3887-3894
·
IF 2.054
Pang Zhongya,Zou Xingli,Tang Wei,Shi Tianyu,Wang Shujuan,Ji Li,Hsu Hsien-Yi,Xu Qian,Lu Xionggang
Carbide-derived carbon (CDC) as an unconventional porous carbon material has been widely used for various applications. In this work, Ti 3 AlC 2 -derived porous carbon (Ti 3 AlC 2 -CDC) was electrochemically synthesized at 900°C and 3.0 V in molten CaCl 2 -NaCl. The obtained Ti 3 AlC 2 -CDC with abundant slit-like mesopores showed a high specific surface area of 425 m 2 /g. The variation of the morphology from the Ti 3 AlC 2 precursor to Ti 3 AlC 2 -CDC was investigated, with the Ti 3 AlC 2 -CDC demonstrating a typical loose layered morphology and amorphous carbon structure. The intermediate products were also systematically analyzed to investigate the molten salt electrochemical etching process. It was found that Ti 3 AlC 2 can be oxidized by residual O 2− in the molten salt to form tiny Al 2 O 3 particles on the anodic Ti 3 AlC 2 surface during the etching process, then Ti 3 AlC 2 -CDC can be obtained by successively removing these Al 2 O 3 , Al, and Ti from the Ti 3 AlC 2 precursor.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源材料
·
表面工程
✓ 已验证
DOI
高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 9
·1491-1497
·
IF 11.534
Liu Yi,Wang Chuangye,Luo Wei,Bai Liang,Xu Yang,Hao Xiaodong,Zhu Jianfeng,Guo Shouwu
The microstructure and morphology of Ti 3 AlC 2 powders not only affect the preparation of Ti 3 C 2 MXene but also have a great influence on their potential applications, such as microwave absorbers, alloy additives, or catalytic supports. However, the synthesis of Ti 3 AlC 2 powders with desired microstructure and morphology remains a challenge. Herein, hollow Ti 3 AlC 2 microrods were prepared for the first time in NaCl/KCl molten salts by using titanium, aluminum, and short carbon fibers as starting materials. It was found that the short carbon fibers not only performed as carbon source but also acted as sacrificial template. Furthermore, it was revealed that TiC and Ti 2 AlC were initially formed on the surface of carbon fibers. The subsequent reactions between the outer Ti, Al and the inner carbon were dominated by the Kirkendall effect which gave rise to the formation of a hollow structure. Based on this mechanism, hollow Ti 3 AlC 2 microspheres and a series of hollow TiC, Ti 2 AlC, and V 2 AlC powders were also successfully fabricated. This work provides a facile route to synthesize hollow MAX phases and may give enlightenment on preparing other hollow carbide powders via the Kirkendall effect in the molten salts.
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
DESALINATION
·
2024
·
IF 8.3
Lei Huang,Lei Sheng,Kuilin Wan,Meicong Wang,Hongguo Zhang,Jia Yan,Yonghui Liu,Sikpaam Issaka Alhassan,Yongsheng Chen,Samuel Raj Babu Arulmani
Fluoride is a common pollutant from nature, normal life, and production. Adsorption, electro-adsorption, and precipitation are dominant mechanisms corresponding to the adsorption and electro-adsorption technologies for removing fluoride. This paper presents Ti 3 AlC 2 as an effective reagent for removing fluoride under acidic conditions. The adsorption mechanisms of adsorption and electro-adsorption were compared to sedimentation at pH 2 and 1, leading to a higher removal rate of adsorption by pH 2 than at pH 1. The adsorptive behavior of Ti 3 AlC 2 with fluoride includes both multilayer sorption and chemisorption. Furthermore, the precipitation reaction induced a partial change of Ti 3 AlC 2 to MXene. Notably, electro-adsorption was more effective rather than sedimentation at pH 1 in capacitive deionization technology. The Al adsorption sites made it easier to combine fluoride than Ti, and aluminum fluoride was easier to produce than titanium (III) fluoride. These adsorption and electro-adsorption experiments were carried out to elucidate and delineate the performance of Ti 3 AlC 2 for removing fluoride. A molecular model of Ti 3 AlC 2 was also built to calculate adsorption using the density functional theory. Hence, the Ti 3 AlC 2 molecular model combined with XPS and other characterizations of materials provided an effective, easy-to-understand combinative mechanism for removing fluoride.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2013
·Vol. 28
·期 5
·882-887
·
IF 0.484
Li Liang,Zhou Aiguo,Xu Lin,Li Zhengyang,Wang Libo
Titanium aluminum carbide (Ti 3 AlC 2 and Ti 2 AlC) powders were synthesized from TiH 2 powders instead of Ti powders as Ti source by a tube furnace under argon atmosphere without preliminary dehydrogenation. 95 wt% pure Ti 3 AlC 2 powders were synthesized from TiH 2 /1.1Al/2TiC at 1 450 °C for 120 min. High-purity Ti 2 AlC powders were also prepared from 3TiH 2 /1.5Al/C and 2TiH 2 /1.5Al/TiC powders at 1 400 °C for 120 min. The as-synthesized samples were porous and easy to be ground into powders. Sn or Si additives in starting materials increased the purity of synthesized Ti 3 AlC 2 obviously and expanded the temperature range for the synthesis of Ti 3 AlC 2 . With Si or Sn as additives, high pure Ti 3 AlC 2 was synthesized at 1 200 °C for 60 min from TiH 2 / x Si/Al/2TiC and TiH 2 / x Sn/Al/2TiC ( x = 0.1, 0.2), respectively.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2019
·Vol. 17
·期 2
·778-789
·
IF 1.074
Weihua Chen,Jiancheng Tang,Xingwang Shi,Nan Ye,Zhihao Yue,Xinghao Lin
High-purity titanium aluminum carbide (Ti 3 AlC 2 ) powders were synthesized by a microwave sintering method using different titanium sources as raw materials. The prepared products were characterized by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicated that the synthesized Ti 3 AlC 2 powders have high purity (97.5%) and even distribution of the grain size when using a 3TiH 2 /1.2Al/2C mixture as raw materials when the microwave sintering temperature and time were 1300°C and 30 minutes, respectively. The formation mechanism of the Ti 3 AlC 2 is described as proceeding via four stages. The solid-phase reaction between titanium and aluminum occurs below the melting point of aluminum and the main product is a Ti 3 Al phase, which is an observed intermediate compound for the formation of Ti 2 AlC and Ti 3 AlC 2 . Thus, this study provides a beneficial approach to low-temperature synthesis of high-purity Ti 3 AlC 2 materials.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Keke Guan,Wen Lei,Honghong Wang,Xuefeng Liu,Jin Luo,Jianghao liu,Quanli Jia,Haijun Zhang,Shaowei Zhang
In this work, Ti 3 AlC 2 powders with high purity were prepared by microwave-assisted molten salt method (MA-MS). The synthesis parameters (such as raw materials ratio, heating temperature and reactant materials) and the formation mechanisms were systematically investigated. The results indicate that Ti 3 AlC 2 powders with a high purity up to 98.5% are prepared using TiH 2 /Al/1.8TiC mixture as reactant materials, and NaCl–KCl as molten salt by microwave-assisted heating at 1050 °C for 30 min. Compared with traditional heating methods, both the synthesis temperature and holding time of highly pure Ti 3 AlC 2 powders synthesized in this work are much milder. This high-efficiency synthesis approach could be ascribed to the synergistic effect of molten salt and microwave heating. Moreover, the TiH 2 –Al–TiC starting material is more suitable for the rapid synthesis of Ti 3 AlC 2 powders with high purity via present microwave-assisted molten salt method than that TiH 2 –Al–C.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOM
·
2024
·
IF 2.1
Jiang Zhenqiang,Pang Zhongya,Chen Shun,Tian Feng,Zhang Xueqiang,Wang Fei,Xia Xuewen,Chen Chaoyi,Li Guangshi,Xu Qian,Lu Xionggang,Zou Xingli
MAX phases and their derived materials (MXenes and CDCs) have received widespread attention because of their unique functional properties. However, the controllable synthesis of MAX phases and their derived powder materials remains challenging, and conventional preparation usually involves high-temperature sintering, mechanical crushing, and acid etching processes. Herein, this paper reports a facile electrochemical strategy for the synthesis of Ti 3 AlC 2 powder and its derived carbon (Ti 3 AlC 2 -CDC) from TiO 2 /Al 2 O 3 /C precursors. In this strategy, the synthesis of Ti 3 AlC 2 is achieved through molten salt electrolysis of a TiO 2 /Al 2 O 3 /C cathode directly, and the Ti 3 AlC 2 -CDC is then prepared through a subsequent molten salt electrochemical etching process. Systematical characterization and analysis of the synthesized Ti 3 AlC 2 and Ti 3 AlC 2 -CDC were conducted, and the results indicate that the Ti 3 AlC 2 synthesized by molten salt electrolysis is a micro-size powder, exhibiting a distinct lamellar structure with uniform element distribution. The synthesized Ti 3 AlC 2 -CDC powder exhibits a high specific surface area of 1268 m 2 g −1 and excellent hierarchical porosity. As a conceptual demonstration, the energy storage properties of Ti 3 AlC 2 -CDC as electrode materials for lithium-ion battery (showing a specific capacity of 330 mAh g −1 ) and sodium-ion battery (showing a specific capacity of 100 mAh g −1 ) were preliminarily investigated, demonstrating excellent cycle stability in both cases. In summary, this work demonstrates the controllable synthesis of Ti 3 AlC 2 and Ti 3 AlC 2 -CDC, offering advanced technological insights into the advancement of MAX phases and their derived powder materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2012
·
IF 1.913
Liang Li,Aiguo Zhou,Libo Wang,Shangsheng Li,Dongxu Wu,Chengqi Yan
In this paper, titanium aluminum carbide (Ti 3 AlC 2 ) was studied as the binder of polycrystalline cubic boron nitride (PCBN) to overcome the weaknesses of traditional metal binders and ceramic binders. The composites of cubic boron nitride (cBN) and Ti 3 AlC 2 were in situ synthesized from the mixtures of Ti, Al, TiC and cBN powders at high temperature (1050 °C–1250 °C) and under high pressure (4.5 GPa) (HTHP). The Ti 3 AlC 2 proportion in as-prepared composites increased as the processing temperature increased from 1050 °C to 1150 °C. At 1200 °C, part of Ti 3 AlC 2 decomposed to form new TiC. At 1250 °C, cBN transformed to hBN and reacted with other materials. The composites processed at 1200 °C had the optimal mechanical properties , including friction coefficient , hardness and mass loss of worn Si 3 N 4 ball. From the microstructure of as-prepared composites, agglomeration of cBN particles existed; however, the cBN particles, in general, were evenly distributed in the matrix of Ti 3 AlC 2 . The cBN particles strongly bonded with the matrix with a clear interface.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Kai Su,Xuekun Tian,Xinmei Hou,Zhenyi Zhao,Xusheng Liu,Deze Ouyang,Huiyu Yuan,Xinhong Liu
Ti 3 AlC 2 powder was prepared via an efficient solid-liquid reaction in flowing argon using coconut shell charcoal as novel carbon source, and phase evolution, microstructure and oxidation behavior of Ti 3 AlC 2 powder were investigated. The results show that coconut shell charcoal is dominated by amorphous carbon after carbonization with some turbostratic graphite-like structure, and large specific surface area of coconut shell charcoal gives its excellent reactivity. Ti 3 AlC 2 powder prepared at 1400 °C for 1.5 h exhibits good crystallinity and typical nanolayered structure. Ti 3 AlC 2 powder remains thermally stable in air below 552 °C, while oxidizing occurs rapidly between 900 and 1100 °C. The isothermal oxidation curves show a parabolic-like, indicating that the oxidation process is primarily controlled by a diffusion mechanism. The good oxidation resistance of Ti 3 AlC 2 powder is attributed to the oxidized products of TiO 2 and Al 2 O 3 grains formed a connected and dense protective layer on the particle surface at elevated temperatures.
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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Junyi Lv,Houbo Xie,Jingzhe Zhang,Guodong Yang,Tao Li,Jinbo Wu,Faliang Li,Haijun Zhang
Ti 3 AlC 2 , notable for its distinctive combination of metallic and ceramic properties, has attracted significant attention. The rapid synthesis of Ti 3 AlC 2 powders is crucial for mass production. In this study, Ti 3 AlC 2 powders with 85 wt% purity were synthesized efficiently using selective laser melting method, utilizing titanium powder, aluminum powder and titanium carbide particles as starting materials. This innovative method reduces synthesis time by a factor of approximately 30–240 compared to traditional heating techniques. Moreover, the apparent oxidation activation energy ( E ) and the pre-exponential factor of the synthesized Ti 3 AlC 2 were calculated as 53.86 kJ/mol and 12.74, respectively. Additionally, a powder composition containing 45 wt% Ti 3 AlC 2 exhibited a maximum reflection loss of −21.5 dB at 8.2 GHz with a thickness of 2.5 mm, achieving effective electromagnetic wave absorption in the frequency range of 7.4 GHz–9.4 GHz.
研究领域:
材料科学
·
物理学
✓ 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）