JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Xiaoyu Wang,Dewei Ni,Bowen Chen,Feiyan Cai,Yang Hu,Yanmein Kan,Yusheng Ding,Shaoming Dong
In this work, a novel multi-anion ultra-high temperature ceramic (UHTCs) powder—Hf 0.8 Zr 0.2 B 0.1 C 0.5 N 0.4 , was designed and synthesized by carbothermal and borothermal reduction above 1400°C using B 4 C, carbon black, and N 2 as boron, carbon, and nitrogen sources, respectively. The as-synthesized Hf 0.8 Zr 0.2 B 0.1 C 0.5 N 0.4 powder has a rock-salt crystal structure and high compositional homogeneity, with lattice constant of 4.602 Å. It has an average particle size of ∼0.13 µm and low oxygen content of ∼0.43 wt%. This work not only expands the category of UHTCs but also opens a new insight to develop and design UHTCs with multi-anion and cation structures for performance optimization.
研究领域:
材料科学
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陶瓷
·
无机合成
✓ 已验证
产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·
IF 2.4
Zhu Liguo,Zhang Zuqing,Kong Lingxin,Wang Chengyuan,Yang Bin,Xu Baoqiang
Ti is produced by the Kroll method, mainly by carbothermic chlorination, magnesiothermic reduction, and vacuum distillation, which result in complex processes, low efficiency, and high cost. Although Ti has many excellent properties, its high production costs limit its widespread applications. There is an urgent need to develop new Ti extraction processes to reduce the cost of Ti production. In this study, we propose a new method for the direct preparation of low-oxygen Ti powder from TiO 2 using Mg as a reducing agent and the formation of CeOCl (2Mg ( l ) + TiO 2 ( s ) + 2CeCl 3 ( l ) = Ti ( s ) + 2CeOCl ( s ) + 2MgCl 2 ( l )). First, a deoxidization experiment of Ti with Mg as a deoxidizer was conducted, and the ability of Mg to deoxidize Ti was demonstrated. At 1273 K, when the activity of CeCl 3 was 1, the oxygen concentrations of Ti-A and Ti-B were 380 and 270 ppm, respectively. Subsequently, the TiO 2 reduction experiment was conducted using Mg as the reducing agent. The results showed that MgO activity was effectively reduced by the formation of CeOCl (MgO( s ) + CeCl 3 ( l ) = MgCl 2 ( l ) + CeOCl( s )). When the system reached the Mg/MgCl 2 /CeOCl/CeCl 3 equilibrium, low-oxygen Ti powder below 1000 ppm was directly produced from TiO 2 .
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
Metals
·
2023
·Vol. 13
·期 8
·1436
·
IF 2.9
Jialong Kang,Yaoran Cui,Dapeng Zhong,Guibao Qiu,Xuewei Lv
Due to TiAl alloys’ excellent properties, TiAl alloys have received widespread attention from researchers. However, the high energy consumption and lengthy process of traditional preparation methods have always limited the large-scale application of TiAl alloys. This article develops a new method for preparing TiAl-based alloy powder via the magnesium thermal reduction of TiO2in AlCl3-KCl molten salt. In this study, the proportion of AlCl3&KCl molten salts was determined. We conducted phase analysis on the final product by studying the changes in temperature and time. It was found that the TiAl3alloy powder could be obtained by being kept at 750 °C for 2 h, with an oxygen content of 3.91 wt%. The reaction process for the entire experiment was determined through thermodynamic calculations and experimental analysis, and the principles of the reduction process are discussed.Keywords:TiAl alloy;magnesium reduction;AlCl3-KCl;TiO2
研究领域:
材料科学
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Wenju Tao,Jiaxin Yang,Zhibo Liu,Yifan Zhang,Liyu Chen,Shaohua Wu,Jinbo Qiao,Zhengduo Xue,Zhaowen Wang
The recovery and utilization of by-product coal fly ash (CFA) in high-value-added thermal power plants is of great significance. This research focused on producing high-value-added Al–Si master alloy by aluminothermic reduction with coal fly ash as the raw material. The effects of reduction time and reducing agent amount on thermal reduction products were investigated using the single factor method. X-ray diffraction (XRD) and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) results showed that Al, Si, and a small amount of Fe were the main components of the alloy. With an increase in reaction time, the mass fraction of Si in the product increased from 4.41% to 9.93%. Besides, the molten salt after thermal reduction was recovered by the electrochemical reduction process. The results showed that a longer electrolysis time is more conducive to improving the recovery of Si and Al. The results of cyclic voltammetry and electrodeposition showed that Si would be reduced in a multi-step process. Combined with thermal reduction and electrochemical secondary recovery process , the comprehensive recovery of Al and Si in fly ash could reach 87.33% and 84.02%, respectively.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2022
·Vol. 53
·期 4
·2753-2762
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IF 2.872
Zhao Zhuqing,Cai Muya,Zhao Haijia,Ma Qiang,Li Xianyang,Xie Hongwei,Xing Pengfei,Zhuang Yanxin,Yin Huayi
Suppressing the formation of SiC during the magnesiothermic reduction of SiO 2 –C composite is still challenging. In this paper, the formation of SiC can be tentatively controlled by tuning the reactivity of reductants that can be modulated by alloying with Si at different atomic ratios. The reduction product is SiC when using Mg as the reductant, while the C–Si composites are formed when using the reductants with relatively low reactivity ( e.g. , Mg–Si alloy, Ca–Si alloy). The obtained C–Si composites reduced from C–SiO 2 show excellent electrochemical performance, delivering a specific discharge capacity of 925 mAh g −1 at 1 A g −1 after 200 cycles and 825 mAh g −1 at 2 A g −1 after 300 cycles. In addition, when bio-silica is used as Si resource, the C–Si composites prepared from the rice husks also exhibit excellent electrochemical performance, delivering a specific discharge capacity of 687 mAh g −1 at 2 A g −1 after 300 cycles. Overall, the revealed reactivity–composition relationship can be extended to selectively prepare carbon- or carbide-based target materials as well as to harvest both C and Si from Si-containing waste biomasses.
研究领域:
材料科学
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化学工程
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电化学
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生物质废物利用
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2024
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IF 4.7
Li-guo ZHU,Chong-lin BAI,Ling-xin KONG,Bin YANG,Bao-qiang XU
To reduce the production cost of titanium, a new method for direct preparation of low-oxygen titanium powder by the magnesiothermic reduction of TiO 2 with the assistance of a MgCl 2 -HoCl 3 molten salt was proposed. Thermodynamic calculations showed that the magnesiothermic reduction of TiO 2 was feasible. However, hindrance of the reduction reaction by the reduction by-product of MgO resulted in a considerably high O concentration in the titanium powder. The addition of HoCl 3 to the system significantly reduces the activity of MgO to produce low-oxygen titanium powder. Thermochemical deoxidation and reduction experiments were conducted with MgCl 2 -HoCl 3 molten salt in the temperature range of 1023-1273 K. The results showed that titanium powder with oxygen concentration (mass fraction) below 5.00×10 -4 can be prepared at the Mg-MgCl 2 -HoOCl-HoCl 3 equilibrium.
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
Catalysis Science & Technology
·
2024
·Vol. 14
·期 22
·6621-6640
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IF 4.4
Bin Guan,Junyan Chen,Zhongqi Zhuang,Zhan Gao,Zeren Ma,Xuehan Hu,Chenyu Zhu,Sikai Zhao,Kaiyou Shu,Hongtao Dang,Tiankui Zhu,Zhen Huang
As a promising future energy material, g-C3N4 as a CO2 photo-thermal-reduction catalyst can effectively convert CO2 to renewable fuel, but the low yield and low product selectivity significantly limit its further development and application. Herein, Ag and Bi2MoO6 were loaded separately or together on g-C3N4 catalysts by photo-deposition and solvothermal synthesis methods, wherein the conversion efficiency of the g-C3N4 catalyst co-loaded with 0.5% Ag and 10% Bi2MoO6 was the highest (CO yield = 50.77 μmol g−1 h−1, CO selectivity = 96.98%). Characterization shows that the co-loading of Ag and Bi2MoO6 reduces the band gap of g-C3N4, improves the light absorption performance, and promotes the photoelectron transfer and CO2 adsorption, which may be attributed to the LSPR of Ag and the Z-scheme heterojunction between g-C3N4 and Bi2MoO6. The results of in situ DRIFTS and DFT calculations are consistent with the above conclusion and show that Ag loading effectively reduces the energy barrier of each intermediate state. This thesis aims to provide data support and theoretical guidance for optimal design of g-C3N4 catalysts.
研究领域:
材料科学
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催化化学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Pengran Gao,Yi Liu,Weixin Lv,Rui Zhang,Wei Liu,Xianfu Bu,Guanghua Li,Lixu Lei
Three artificial mixtures of PbSO 4 and PbO 2 as well as the active materials obtained directly from the positive plates of spent batteries have been solvothermally treated in methanol at 140 °C for 24 h, which produce mainly PbO·PbSO 4 . The PbO·PbSO 4 can be easily desulphated with ammonium carbonate to produce PbCO 3 , which can be calcined to form α-PbO to be used as positive active material of lead acid batteries . The α-PbO powders are irregular particles and highly electrochemically active, which discharges around 165 mAh g −1 at 5 mA g −1 , 80 mAh g −1 at 200 mA g −1 and 60 mAh g −1 at 400 mA g −1 with excellent cyclic stability in 50 cycles. SEM investigations show that the as-formed PbO·PbSO 4 may inherit and enhance the morphological characteristics of PbSO 4 , and carbonation of PbO·PbSO 4 does not destroy the rod-like characteristics. For the active material from the positive plates of spent lead acid batteries, the discharge capacities are 170 mAh g −1 at the current density of 5 mA g −1 , and 60 mAh g −1 at 400 mA g −1 , which is also similar. In 50 cycles, its capacity loss is only 5%.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Qinglin Zeng,Bochao Xu,Zepeng Lv,Shaolong Li,Jilin He,Jianxun Song
This study demonstrates the synthesis of a NbC x O y solid solution through carbothermic reduction and the subsequent extraction of metallic niobium through molten salt electrolysis. Thermodynamic analysis and carbothermic reduction were conducted to determine the optimal conditions for synthesizing the NbC x O y solid solution at different compositions, enabling precise control over their composition. Furthermore, metallic niobium was produced via the molten salt electrolysis of the selected NbC x O y solid solution for 16 h at 2.9 V in the NaCl–KCl eutectic molten salt at 750 °C.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Lei Yang,Yangyang Zhang,Hua Li,Hezhou Liu
Metallic bismuth crystal is one important and interesting semimetal that has attracted great attention owing to its unique thermal and electrical properties. Herein, we report a facile, green, cost-effective and sustainable solvothermal process using ethanol, glycol, isopropanol, phenylcarbinol as solvent and commercial Bi 2 O 3 as the starting material to produce high-purity metallic Bi with tunable morphologies on large scale. It is found that all alcohols are capable of reducing Bi 2 O 3 to Bi and the reducibility of glycol is proved to be the strongest. The highest purity of the resultant Bi is calculated to be 99.74%. What's more, the morphology of final Bi particles is controllable by adding various types and concentrations of additives. As a consequence, our work lays the root for the large scale solvothermal production of high-purity Bi particles with various regular morphologies.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Central South University
·
2023
·Vol. 30
·期 5
·1512-1522
·
IF 4.4
Dong Zhao-wang,Duan Liang-hong,Liu Han-ning,Guo Xue-yi,Xia Yang
High-purity zirconium metal has been of rising significance to the nuclear and energy industry. However, zirconium exhibits a strong chemical affinity to oxygen, which causes high-purity zirconium metal to be difficult to produce cost-effectively. Powder metallurgy for preparing zirconium metal can achieve near net forming of zirconium metal. Zirconium powder can be prepared by deoxidation of zirconium hydride powder. In this study, an efficient process was proposed to prepare high-purity ZrH 2 using magnesium powder as reducing agent in hydrogen atmosphere. A specific investigation was conducted on the effect of hydrogen on the magnesiothermic reduction and deoxidation of ZrO 2 . As indicated from the results, the oxygen content of the reduced powder in Ar was over three times that in H 2 atmosphere at 750 °C for 240 min. Moreover, a passive oxide layer, with a thickness of ~2.76 nm in H 2 and of ~8.51 nm in argon, was formed on the edge of the reduced powder. In accordance with thermodynamic calculation, hydrogen was found to be capable of destabilizing Zr-O solution. An ultra-high pure zirconium hydride powder containing <350×10 −6 oxygen and particle size of <100 µm was prepared as assisted by hydrogen.
研究领域:
材料科学
·
核能工程
·
粉末冶金
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2018
·Vol. 8
·期 9
·698
·
IF 1.704
Guobo Yang,Baoqiang Xu,Heli Wan,Fengkang Wang,Bin Yang,Zhijun Wang
The compound CaCl2plays a significant role in the process of direct calciothermic reduction of Ti2O3to prepare porous titanium. In this paper, the effect of CaCl2on reduction products by calciothermic reduction of Ti2O3was investigated. Results show that the distribution of CaCl2in reduction preform influences particle size and morphology differences in reduction products both on the surface and the inside. The CaCl2is transferred to the surface of the Ti2O3preform due to its volatilization before and throughout reduction. The content of CaCl2in the surface zone of Ti2O3preform is significantly higher than that in the interior during the reduction process, contributing to the formation of large Ti particles with a smooth shape on the surface, and small Ti particles with inherited morphology of Ti2O3inside. More CaCl2causes the aggregation of Ti particles to form large Ti particles which are advantageous as they connect and form a more solid porous titanium structure. The presence of a small amount of CaCl2in the interior also results in the coexistence of small Ti and CaO particles, forming a loose structure with uniform distribution.Keywords:CaCl2;calciothermic reduction;Ti2O3;microstructure;morphology;Ti particles
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）