JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Ying Zhang,Pei Sun,Zak Fang,Shili Zheng,Xiaofang Zhu
Deoxygenation is in high demand in the titanium industry. This research was carried out to experimentally determine the oxygen removal limits by the novel hydrogen-assisted Mg deoxygenation method. Spherical Ti and Ti-6Al-4V (or TC4, Ti64) powders with around 2.2 wt% oxygen were prepared for the deoxygenation research. The deoxygenation kinetics were modeled based on a non-steady-state radial diffusion. The results show that in the β phase region, the time to reach the equilibrium is slightly affected by the initial oxygen content in titanium, but is strongly influenced by the particle size. The reliance of the equilibrium duration on the diffusion coefficient is stronger when the particle size is larger. Guided by the kinetic prediction, deoxygenation experiments were carried out. Under a 1 atm pure H 2 atmosphere, the deoxygenation limits by Mg for pure Ti are 252 ppm at 700 °C, 289 ppm at 750 °C, and 554 ppm at 800 °C, and for TC4 are 296 ppm at 750 °C, 371 ppm at 800 °C, and 743 ppm at 850 °C, consistent with the thermodynamics that a lower temperature possesses a more potent driving force for deoxygenation. These data have clearly demonstrated the strong deoxygenation capability of the hydrogen-assisted Mg deoxygenation method.
研究领域:
材料科学
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冶金工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 29
·23187-23195
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IF 2.779
Yi Junhui,Li Minghao,Xie Runkun,Liao Xiaoying,You Jinfeng,Chen Beifang,Liu Qiqi,Huang Weili
CuBi 2 O 4 is widely used in photocatalytic degradation for pollutants in water due to its strong visible light response characteristics, excellent chemical stability, non-toxic, and low cost. Here, stone-shaped CuBi 2 O 4 was prepared with CuO and Bi 2 O 3 as raw materials by high temperature solid phase. The effect of calcined temperature and time on the product was discussed. This material was analyzed and discussed by XRD, SEM, XPS, and DRS, and the visible light activity of degradation for Orange II was explored. The results showed that the absorption edge of prepared CuBi 2 O 4 expands to the visible region, and the band gap was about 1.77 eV. The photocatalytic degradation rate of Orange II was 42.6% under the optimal conditions. After H 2 O 2 assisted, the degradation rate was more than 2 times, and repeated experiments verified that the prepared catalysts had high stability. Finally, a reasonable mechanism of H 2 O 2 assisted degradation enhancement is proposed. This work gives new ideas for the preparation of new and efficient catalytic materials.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2025
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IF 8.2
Wenqing Liang,Shengqiang Ren,Xia Hao,Cong Chen,Chao Ding,Jingquan Zhang,Shuyu Zhang,Dewei Zhao
Low-dimensional lead-free perovskite single crystals (SCs) have exhibited great potential in high-energy ionizing radiation detections owing to their outstanding sensitivity and charge transport properties. However, the preparation of chlorine-based SCs is more challenging due to their low solubility in organic solvents and acidic solutions. In this work, we report a universal growth strategy of hydrochloric acid-assisted temperature lowering for low-dimensional layered perovskite CsMnCl3·2H2O SCs. Compared with SCs prepared by solution evaporation crystallization, centimeter-sized SCs were achieved with ultrahigh crystal quality, showing a very small full width at half-maximum of 0.02° at the plane (002). Our layered perovskite CsMnCl3 2H2O X-ray detector shows unique anisotropic X-ray detecting performance at parallel and perpendicular to the (002) crystal plane. An ultralow detection limit of 9.3 nGyair s–1 has been obtained, which is significantly lower than the 5.5 μGyair s–1 required for regular medical diagnostics. Furthermore, the device shows enhanced stability with a slight degradation of 8% after storage in air ambient for 6 months. Our work suggests a promising approach to fabricate high-quality SCs for sensitive and stable X-ray detection applications.
研究领域:
材料科学
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辐射探测技术
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产品关联
DOI
PubMed
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
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IF 4.217
Yun Wei,Yupeng Shi,Xuefeng Zhang,Dan Li,Lei Zhang,Chunhong Gong,Jingwei Zhang
In this work, black titanium monoxide (TiO) nanoparticles were synthesized by hydrogen assisted magnesium thermal reduction method from nanotube titanic acid (NTA) and their electromagnetic properties were investigated. The black TiO nanoparticles exhibited the optimal reflection loss of −37.7 dB at a thin absorbance layer of 1.2 mm in thickness, which showing a promising candidate in electromagnetic wave absorbing (EA). To explore the mechanism of EA, TiO nanoparticles prepared from the other two initiators (commercial grade TiO and P25 titanium dioxide) was used as a comparison. The results show that the crystalline structure and microscopic defects, which arouse from the formation of TiO in the hydrogen assisted process, affect the electromagnetic performance of Ti-O binary system significantly in addition to their intrinsic effects. We hope this study help to open a new way for the designing of high-performance EA materials.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Mingyuan Zhang,Taotao Cai,Weiliang Lu,Shili Zheng,Ying Zhang,Yi Zhang
Given the high cost of fabricating the Ti-6Al-4V alloy powder by the traditional hydriding-dehydriding and atomization methods, a novel sintering-deoxygenation process was proposed and studied in this research. With the help of the developed deoxygenation treatment, value-added raw materials such as Ti sponge can be substituted by low-cost and low-grade materials with high oxygen content. In addition, sintering in a solid state saves a significant amount of processing energy compared to alloying above the melting point of Ti in the conventional alloy production process. This paper prepared six sintering precursors with different initial compositions and oxygen contents using the low-valued raw materials of crude titanium, crude vanadium, V 2 O 3 , Al powder, and Al 2 O 3 powder. These precursors' sintering performances on shrinkage, phase composition, microstructure, and porosity were investigated. The results show that the sintering shrinkage is positively correlated with the sintering temperature and holding time and is also affected by the raw materials. The pellet made by mixed crude titanium and AlV master alloy showed the largest shrinkage and the densest bulk. The various combinations of the raw materials led to the changes in the oxygen contents in the precursors, the alpha-beta phase ratio, and the shift of the diffraction peaks of the α-phase. The dissolving of the AlV master alloy and the formation of the Ti 3 Al intermediate phase took place during sintering due to diffusion. Sintering at 900–1000 °C is critical for elemental diffusion and densification, and sintering at higher temperatures is decisive for microstructure homogenization and further densification. Using the hydrogen-assisted Mg deoxygenation method, all the sintered samples could be treated to an oxygen level of around 0.4 wt% regardless of oxygen content in precursors. The contents of Ti, Al, V, and Fe in the obtained Ti-6Al-4V powders met the requirements of GB/T 34486-2017. This research has demonstrated the feasibility of fabricating Ti-6Al-4V alloy powder by the novel sintering-deoxygenation process.
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
危险品化学品经营许可证（带存储）