MATERIALS CHARACTERIZATION
·
2022
·
IF 4.537
Qian Ma,Qingliang Shan,Changrong Chen,Qiankun Xu,Yewei Wang,Yuqian Zhou,Anze Shui
To obtain aluminum titanate (AT, Al 2 TiO 5 ) ceramics with excellent mechanical properties , the ZrO 2 was introduced into AT flexible ceramic to modify the microstructure of it. Results show that ZrO 2 can significantly improve the mechanical properties of AT flexible ceramics. When the addition of ZrO 2 is 8 wt% and 12 wt%, the optimal strain and strength increase by ~52% and ~ 46%, respectively. The statistical results show that ZrO 2 can not only refine the AT grains but also improve the aspect ratio, which leads to more events of grain pull-out and transgranular fracture . Since the generated ZrTiO 4 is pinned in the AT grain boundary microcracks , the phenomenon of branching and deflection of main crack will increase, rising the resistance of main crack propagation . It is expectable that the discovery of this work is benefitted to solve the brittle limitation of ceramics.
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
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jialiang Zhao,Jinlian Li,Xiaofang Zhang,Xudong Luo,JiJia Li,Xin Qi,Yiran Man,Rui Lin,Zhipeng Xie
Currently, porous Al 2 O 3 ceramics have attracted extensive attention because of their unique properties. However, the low strength of porous Al 2 O 3 ceramics constrains their practical application. Herein, the porous Al 2 TiO 5 –Al 2 O 3 ceramics with higher strength were prepared through the Al 2 O 3 hollow spheres (HSs) coated with TiO 2 sol using co-precipitation method. The present work is to study the effects of Al 2 TiO 5 solution content on the sintering behavior and mechanical properties of porous Al 2 O 3 ceramics. Then, the enhancement mechanism was analyzed by comparison of the bulk density, porous, shrinkage, compressive strength , and the resultant microstructure. With Ti(SO 4 ) 2 solution content as the primary parameter to control the Al 2 TiO 5 content, it was found that when Ti(SO 4 ) 2 solution content was 15 mL, the minimum value of porosity reached 30.4%, while the maximum values of bulk density and shrinkage reached 2.52 g/cm 3 and 9.4%, respectively. Furthermore, the compressive strength of porous Al 2 O 3 ceramics containing 15 mL Ti(SO 4 ) 2 solution reached a maximum of 53.1 MPa, which is attributed to the formation of the liquid phase and the presence of elongated Al 2 TiO 5 grains. This results from the improvement of bonding strength between Al 2 O 3 HSs.
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 Environmental Chemical Engineering
·
2018
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IF 0
Changchang Ma,Xin Yao,Lu Wang,Zihao Cai,Hai Huang,Xin Gao,Rongru Chen,Yang Liu,Pengwei Huo,Yongsheng Yan
A novel plasmonic photocatalysts of Ag@CdSe/Al 2 TiO 5 was successfully prepared via a simple and mild wet-chemical process. The physical and photophysical properties of the as-prepared Ag@CdSe/Al 2 TiO 5 samples were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Ultraviolet–visible diffuse reflection spectroscopy (DRS), photoluminescence emission spectra (PL) and electrochemical impedance spectroscopy (EIS). The interaction between Ag@CdSe and Al 2 TiO 5 has been characterized by X-ray photoelectron spectroscopy (XPS) analysis, and which is facile to the electron transfer between Ag@CdSe and Al 2 TiO 5 and enhancing photocatalytic performance of Ag@CdSe/Al 2 TiO 5 composite photocatalyst. The photocatalytic experiments demonstrat that the Ag@CdSe species can efficiently improve the separation efficiency of photoinducing electrons and holes and consequently improve the methylene blue (MB) photodegradation activity. The 20 wt% Ag@CdSe/Al 2 TiO 5 sample exhibit the most superior photocatalytic activity. A possible photocatalytic mechanism of MB over Ag@CdSe/Al 2 TiO 5 is proposed, which can be attributed the success to the surface plasmon resonance (SPR) effect from Ag/AgCl species.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 6
·922-934
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IF 11.534
Liu Wei,Xie Yongshuai,Deng Zhezhe,Peng Ying,Dong Jianhong,Zhu Ze,Ma Dehua,Zhu Luyi,Zhang Guanghui,Wang Xinqiang
Yttria-stabilized zirconia (YSZ) fiber composites are highly efficient thermal insulating materials; however, the poor thermal shock resistance limits their versatile applications. In the present study, YSZ fiber was mixed directly with Al2TiO5 fiber, which had an extremely low thermal expansion coefficient, to prepare YSZ−Al 2 TiO 5 (ZAT) fiber composites by compression molding and heat treatment. The minimum thermal expansion coefficient of the prepared ZAT fiber composites was measured to be 7.74×10 −6 K −1 , which was 26% lower than that of the YSZ fiber composites (10.42×10 −6 K −1 ). It was shown that the prepared ZAT fiber composites maintain the integrity after undergoing 51 thermal shock cycles between 1100 °C and room temperature. Whereas, YSZ fiber composites burst immediately after only one thermal shock cycle under the same condition. In addition, the ZAT fiber composites also exhibit considerable mechanical and thermal insulating performance.
研究领域:
材料科学
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热力学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
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IF 3.133
Changchang Ma,Dan Wu,Xin Yao,Xinlin Liu,Maobin Wei,Yang Liu,Zhongfei Ma,Pengwei Huo,Yongsheng Yan
Heterojunction with nano-level interfacial contact has an advantage in improving the transfer capacity of photongenerated carriers. In consequence, a heterojunction composite with nano-level interfacial contact was developed by establishing CdSe/Al 2 TiO 5 heterojunction composites. The heterojunction composite was established by combining Al 2 TiO 5 and CdSe nanocrystals . They provided superior nano-level interfacial contact. The photocatalytic activity of heterojunction composites were illustrated to be significantly improved compared to that of pure Al 2 TiO 5 and CdSe nanocrystals. Moreover, the photocurrent intensity of heterojunction composites displays a several times enhancement, implying the promotion of photocatalytic activity was owned to the nano-level interfacial contact with ideal photogenerated electron-hole pairs transfer behavior.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 4
·2449-2465
·
IF 2.1
Qingliang Shan,Qian Ma,Yudong Xue,Haolin Li,Xiaoyan Yang,Anze Shui
The damage modes of Al 2 TiO 5 flexible ceramics (AT) with microcracks strengthened were studied by machine leaning for damage mode identification. Results show that the optimal number of clusters increases from 3 to 4 with the increase of ZrO 2 content. Meanwhile, the concentrated region of cluster with the same label gradually shifts to the direction of low amplitude with increase of ZrO 2 . In addition, the quantity of cluster is easy saturated since the AT grain boundary microcracks are strengthened by the formation of ZrTiO 4 . For achieving the automatic identification of different damage modes, support vector machine based on Kennard-stone training set selection was used to distinguish the damage modes of other samples in the same sample set. Almost the same evolution trend of corresponding clusters in new samples and training samples proves high efficiencies of this method.
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 48
·期 3
·3875-3883
·
IF 4.527
Qingliang Shan,Qian Ma,Changrong Chen,Qiankun Xu,Yudong Xue,Hao Xiong,Yewei Wang,Yuqian Zhou,Anze Shui
In this study, the effect of microcrcaks strengthening on damage evolution of Al 2 TiO 5 (AT) flexible ceramics was investigated by acoustic emission (AE). Results reveal that with increasing content of ZrO 2 , the strength of AT flexible ceramics improves gradually and the strain increases at first then decreases. When the content of ZrO 2 is 12% and 8%, the strength and strain at maximum stress are increased by 154.92% and 38.27%, respectively. In addition, thanks to the “strengthening effect” of ZrTiO 4 on grain boundary microcracks, the damage development thresholds ( σ min and σ onset ), elastic modulus and fracture toughness of AT flexible ceramics modified with ZrO 2 are significantly improved. Moreover, the visible transverse cracks and matrix shedding in ATZ-0 are the most, but the cumulative AE damage events in ATZ-8 and ATZ-4 are more than ATZ-0 at late stage, for which the fracture of ZrTiO 4 glass phase and crack branching induced by ZrTiO 4 should be responsible.
研究领域:
材料科学
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陶瓷学
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固态物理
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力学性能
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结构表征
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断裂力学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2022
·
IF 3.752
Yi Wang,Peng Jiang,M.A. Subramanian,Wenbin Cao
Single phase Al 2-2 x Ni x Ti 1+ x O 5 (0 ≤ x ≤ 0.4) solid solutions were successfully synthesized by solid-phase reaction. The color of the compounds varied from yellow ( x = 0.1) to turmeric ( x = 0.4) with increasing nickel content. X-ray photoelectron spectroscopy analysis confirmed that the oxidation state of Ni is +2. The UV–Vis absorption spectrum showed that the color of the sample comes from the d-d transition of Ni 2+ in octahedral coordination. Owing to excellent high temperature stability, the as-prepared oxide powders (10 wt%) were mechanically mixing with Al 2 O 3 by conventional ball milling to prepare colored alumina ceramics. When Al 2 O 3 is in excess, the blue NiAl 2 O 4 impurity phase appeared, contributing to an intense green color of the Al 2 O 3 ceramics composite. The Vickers micro hardness value of green alumina was higher than that of pure white alumina. The as-prepared samples were also dispersed in PMMA and bright yellow polymer composites were obtained, indicating great potential in polymer colorant.
研究领域:
材料科学
·
陶瓷
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颜料化学
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qian Ma,Anze Shui,Hulei Yu
The thermal shock behaviors of the multiple crack system based on aluminum titanate (Al 2 TiO 5 , AT) flexible ceramics are investigated. Two (fine/coarse-grained) systems are employed in this study to observe the influence of the grain size and microcrack size on the thermal shock behaviors of AT flexible ceramics. The findings reveal that these two systems exhibit markedly different adversarial strategies against high-temperature thermal shock. The coarse-grained system disperses the thermal stress by introducing new cracks and making stress evenly dispersed, while the fine-grained one can only concentrate thermal stress on limited microcracks. This is because almost all the grain boundaries in the coarse-grained system could serve as crack source sites, while that was only approximately 1/3 in the fine-grained one. Consequently, as the thermal shock temperature increases, the strain of the coarse-grained system first increases and then decreases, while its strength shows double peaks and double valleys. As for the fine-grained one, the strain decreases with the temperature increase, while its strength first increases and then decreases. Therefore, it can be concluded that the mechanical properties of AT flexible ceramics are closely related to microcracks' size and stress state. And, the conclusion that there exists a favorable state of internal stress and a favorable influence of microcracks that is beneficial to the mechanical performance of AT flexible ceramics could be drawn.
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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Mengting Jiang,Chenying Shi,Yuling Liu,Xiaopeng Li,Tengfei Deng
The mechanism of Mg 2+ introduction on the thermal expansion properties of Al 2 TiO 5 ceramics was elucidated through experimental characterization and theoretical calculation for Mg x Al 2(1-x) Ti 1+x O 5 (x = 0, 0.25, 0.50, 0.75). Results showed that as x increased from 0 to 0.75, the calculated thermal expansion coefficient (single-crystal) exhibited minimal variation, while the apparent thermal expansion coefficient (polycrystalline) increased from 0.09 × 10 -6 K -1 to 3.85 × 10 -6 K -1 (1000 °C). The low apparent thermal expansion of Al 2 TiO 5 (x = 0) was attributed to microcrack healing and pore compensation effects. For x = 0.75, the enhanced apparent thermal expansion was correlated with reduced microcrack formation and improved densification. The incorporation of Mg 2+ reduced octahedral distortion and lattice stiffness, thereby suppressing transverse vibrations of bridging oxygen atoms and contraction along the c-axis. This reduced thermal expansion anisotropy and minimized microcrack formation. Additionally, as Mg 2+ content increased from x = 0 to x = 0.75, the porosity reduced from (11.23 ± 0.13) % to (3.96 ± 0.24) %, thereby weakening the pore compensation effect. These findings provide valuable insights for designing Al 2 TiO 5 -based ceramics with low thermal expansion.
研究领域:
材料科学
·
无机非金属材料
·
热物理性能
✓ 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）