International Journal of Applied Ceramic Technology
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2022
·Vol. 19
·期 4
·1916-1928
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IF 2.328
Xiao-Chun Deng,Kai-Fei Wang,Guo-Hua Zhang
Combining spray drying and in situ synthesized technology, WC–10Co cemented carbide with uniform composition was prepared by vacuum sintering. The effects of Al 2 O 3 and additions of different rare-earth oxides (La 2 O 3 , Y 2 O 3 and CeO 2 ) on the microstructure and mechanical properties of WC–10Co were investigated. As the Al 2 O 3 content increased from .5 to 2 wt%, the hardness of the sintered sample increased, whereas the relative density and fracture toughness decreased. Compared with the addition of .5 wt% Al 2 O 3 , the WC–10Co alloy with .5 wt% rare-earth oxides had higher hardness. In addition, compared with the alloy without an inhibitor (.80 μm), after adding .5 wt% Al 2 O 3 , La 2 O 3 , Y 2 O 3 and CeO 2 , the WC grain sizes were reduced to .73, .65, .71 and .62 μm, respectively, which indicated that the addition of Al 2 O 3 and rare-earth oxides could refine WC grain during sintering. Among these additives, CeO 2 had the best effect. With the addition of .5 wt% CeO 2 , the hardness and the fracture toughness increased from 1299 to 1710 HV 30 and from 16.18 to 18.90 MPa m 1/2 , respectively.
研究领域:
材料科学
·
机械工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yunhua Bai,Jiali Ma,Xiong-Fei Zhang,Mengjiao Yu,Xiaoli Gu,Jianfeng Yao
Frequent oil spills have caused severe damage to marine ecosystems, necessitating the development of effective and sustainable methods for oil/water separation. This study utilized green-sourced bacterial cellulose and chitin as raw materials without the need of additional additives. Through freeze-drying and carbonization at 500 °C, a hydrophobic, oleophilic cellulose-based carbon aerogel (CBC) was synthesized. The results indicate that the optimal sample has a high specific surface area (489 m 2 /g), excellent oil absorption capacity (∼138 g/g), and remarkable hydrophobicity (with a water contact angle of 135°). Additionally, the carbon aerogel demonstrates good thermal stability, can be reused multiple times, and can effectively separate immiscible oil/water mixtures and stable water-in-oil emulsions. These findings suggest that CBC, as a scalable and eco-friendly material, holds great potential for marine oil spill remediation, offering new possibilities for advancing sustainable environmental restoration.
研究领域:
环境科学
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材料科学
·
化学工程
·
海洋生态学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2021
·
IF 5.234
Siqi Xiang,Xingjian Du,Yihan Liang,Mengcheng Zhou,Xinfang Zhang
Full density TiC reinforced Cu matrix composites are fabricated by electropulsing-assisted flash sintering within 40 s. The addition of TiC significantly increases the hardness of the sintered sample. However, liquid Cu does not wet stoichiometric TiC, leading to a poor interface bonding strength between TiC and Cu, thus the tensile strength of the sintered sample is destroyed. By adding a small amount of Ti, the bonding strength of the interface between TiC and Cu can be effectively optimized, thereby the mechanical strength of the samples is improved, showing an increased hardness and tensile strength . Skillfully use the relationship between hardness and tensile strength curve to intuitively show the bonding strength of the micro interface from the macro characteristics. The reaction between dissolved Ti and stoichiometric TiC and the decomposition of stoichiometric TiC cause the formation of near-surface non-stoichiometric TiC x ( x < 1) with a marked metal-like electronic structure, which is the fundamental reason for the optimization of the interface bonding between TiC particles and Cu matrix. In the process of powder metallurgy , it is a promising strategy to enhance the composite materials by adjusting the stoichiometry of ceramic to form metal-like electronic structure and alter the bonding strength of ceramic/metal interface.
研究领域:
材料科学
·
粉末冶金
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金属基复合材料
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界面工程
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固态加工
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
He Sun,Jiaming Chen,Yusheng Yang,Min Qiu,Milin Zhang
A low-grade ore containing 4 % niobium and 7 % titanium has been extracted from Bayan Obo tailing, but its potential has not been fully utilized. This study aims to recover the niobium and titanium elements from this low-grade ores in the form of their carbides. The process involves reducing niobium and titanium to (Nb,Ti)C through a carbothermal process. During this process, iron and silicon are also reduced to Fe-Si intermetallic compounds, allowing (Nb,Ti)C to diffuse into them. Subsequently, selective electrochemical oxidation is used to separate (Nb,Ti)C from the Fe-Si intermetallic compounds in an aqueous ferrous sulfate solution. The Fe-Si intermetallic compounds are first oxidized to the Fe 3 Si phase, and then to the Fe 5 Si 3 phase in the solution with pH 0.35. The (Nb,Ti)C/matrix interfaces are identified as the preferred site of electrochemical pitting corrosion. By exploiting the electrochemical oxidation reaction of iron in the matrix, (Nb,Ti)C powders are separated along these interfaces. The by-products of this process are FeSi alloys, which are evaluated for their electrocatalytic properties in oxygen evolution reactions. It is found that the Fe 5 Si 3 alloy by-product exhibits good electrocatalytic activity and kinetics in the oxygen evolution reaction, demonstrating its potential for practical applications.
研究领域:
冶金学
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材料科学
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电化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Lilin Fang,Peng Cui,Dongni Liu,Xiaosi Sun,Hao Ren,Hanyu Zhang,Yan Huang,Wenshuai Zhu,Zhichang Liu
The polycyclic aromatic hydrocarbons (PAHs) are serious organic contaminants that are produced naturally and anthropogenically. The separation of PAHs by adsorption approach provides an efficient method to avoid the negative effects of PAHs pollution. In this study, cyclodextrin (CD) was grafted to chitosan (CS) by using glutaraldehyde as crosslinking agent to construct shaped CD-CS polymers and carbonization was executed subsequently. The carbonized β-CD-CS-1000 exhibited a significant increasement of BET surface area (CD-CS polymer: 1 m 2 ·g −1 ; β-CD-CS-1000: 1083 m 2 ·g −1 ) and great PAHs adsorption performance (anthracene: 106.34 mg/g; acenaphthylene: 41.02 mg/g). The adsorption kinetic behavior and the equilibrium adsorption process were further explored. β-CD-CS-1000 showed good cyclic adsorption capacity and anti-interference stability with the xylenes as interferon. Furthermore, the adsorbents based CD-CS can be synthesized at the gram-level in the lab and exhibited great adsorption capacity in real diesel. The large-scale preparation of shaped CD-CS adsorbents made it possible to be applied to the petrochemical industry.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 11
·9338-9343
·
IF 3.289
X. W. Chen,S. M. Dong,Y. M. Kan,H. J. Zhou,J. B. Hu,Y. S. Ding
Boron carbide (B4C) powder was synthesized by heating a gel precursor with pyrolysis and carbothermal processes. The gel precursor was prepared by the condensation reaction of boric acid (H3BO3) and polyvinyl alcohol (PVA) at a weight ratio of 1/2 with the addition of various amounts of glycerine. The effects of glycerine addition on the synthesis of B4C powder were studied. It was observed that glycerine could promote the condensation reaction and resulted in a pyrolyzed precursor with a much finer distribution of B2O3 in the carbon matrix. This led to a significant reduction of residual free carbon in the B4C powder. Moreover, the morphology of the B4C powder was also found to be closely related to the glycerine addition.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 10
·2232
·
IF 3.2
Binbin Fu,Chaoran Wang,Dan Wang
This study investigates the impact of different temperatures and initial Mg2+/Ca2+molar ratios in the solution on the wet-accelerated carbonation of β-dicalcium silicate (β-C2S). The x-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), thermogravimetric analyzer (TGA), and field emission scanning electron microscopy (FE-SEM) analysis results indicated that temperature and the Mg2+/Ca2+molar ratio are key factors in the nucleation of aragonite. Aragonite formed at a temperature above 60 °C, and the high temperature promoted the crystallinity of needle-like aragonite with a length of 1–6 μm and a diameter of ~1 μm. Moreover, 80 °C was the most favorable temperature for the formation of aragonite with a large aspect ratio in the carbonation system of β-C2S. Mg2+had a significant effect on inhibiting the transformation of aragonite to calcite and promoting the stability of aragonite. Aragonite became the dominant CaCO3polymorph instead of calcite when the Mg2+/Ca2+molar ratio was above 1.0, and pure aragonite-style calcium carbonate was formed at a Mg2+/Ca2+molar ratio of 1.5.
研究领域:
材料科学
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无机化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-15
·
IF 3.9
Feng Liujun,Chen Zhiqiang,Wang Haiyan,Chen Zhibiao,Chen Zuliang,Liu Jianhua,Zeng Yuee
Phytoremediation is currently a very popular remediation method for salvaging rare earth mining sites. However, there is still a challenge concerning how to use secondary resources such as plant biomass following the extraction of rare earth elements (REEs). Herein, Dicranopteris pedata (Houtt.) Nakaike, a REEs hyperaccumulator, served to fabricate REEs-rich carbonisation materials (REEs/C) at different temperatures. The results showed that the percentages of Pb(II) removed using REEs/C prepared at 400 °C (REEs/C-4) and 800 °C (REEs/C-8) were 85.1% and 84.0%, respectively. These amounts were better than that of REEs-C prepared at 600 °C (REEs/C-6 (67.0%)). Characterisation analysis confirmed that rich functional groups like aromatic, hydroxyl and C = C/C-C in REEs/C-4 provided more chelation sites to effectively complex with Pb(II), while the superior removal capacity of REEs/C-8 resulted from the enrichment of more REEs and abundant pore structure. Chemisorption, such as ion exchange and chelation, plays a significant role in adsorption. During the carbonisation process of REEs/C, the REEs enriched in Dicranopteris pedata contributed to the formation of rare earth oxides and oxygen vacancies in the material, and these properties enhanced the Pb removal ability of REEs/C. Moreover, the REEs contained in the material did not cause a leaching phenomenon during Pb removal, which is a safe and environmentally friendly material. Finally, the REEs/C was applied to wastewater, and it was found that this material could effectively adsorb Pb from wastewater. Overall, this study generates a new insight into: firstly, how to use phytoextracted biomass containing REEs as valuable REEs/C materials; and secondly, how to save the environment by using technology that promotes recycling of used materials.
研究领域:
环境科学
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材料科学
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植物学
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产品关联
DOI
PubMed
高影响因子
WASTE MANAGEMENT
·
2018
·
IF 4.723
Junqiang Zhang,Zhishuai Wang,Tong Li,Zhi Wang,Shu Zhang,Mei Zhong,Yue'e Liu,Xuzhong Gong
CaO-containing carbon pellets (CCCP) was prepared by mixing carbide slag (Ca(OH) 2 ) and powdered char to produce CaC 2 , achieving the recycling of carbide slag during CaC 2 production process. The thermal strength of CCCP was the focus of most attention when employing arc furnaces as reactors for CaC 2 production in industry. To improve the thermal strength of CCCP, H 3 PO 4 was used as a binder in this study. The results indicated that Ca 3 (PO 4 ) 2 reacted by H 3 PO 4 and Ca(OH) 2 could help refine the average particle sizes of CaO, resulted in a relatively uniform pore diameter distribution of CCCP with low porosity, therefore improving the thermal strength of CCCP. When H 3 PO 4 content was more than 8 wt%, some over-sintering and melting structure for CaO particles appear, and thus resulting in the decrease in thermal strength of CCCP. The experimental results show that CCCP with 3% H 3 PO 4 has the best thermal strength at 1100 °C. The non-isothermal shrinkage kinetics of CCCP indicated that the addition of 3% H 3 PO 4 reduced the apparent activation energy of sintering reactions and accelerated the sintering of CaO particles in CCCP. Furthermore, the addition of H 3 PO 4 has a positive effect on the formation of CaO sintered necks, enhancing the strength of CCCP.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 4
·2399-2406
·
IF 3.094
Yu Wang,He Zhang,Shuqiang Jiao,Kuo-Chih Chou,Guo-Hua Zhang
Molybdenum boride is an ideal hard and wear-resistant material. In this study, a new method is proposed for preparing molybdenum boride, by which Mo first reacts with B 4 C to generate the mixture of molybdenum boride and C, and then the product is decarburized by molten Ca to generate CaC 2 . Pure molybdenum boride could be obtained after acid leaching to remove the by-product CaC 2 . According to the experimental and thermodynamic calculation results, it is concluded that the single-phase MoB could be successfully prepared, while Mo 2 B, Mo 2 B 5 , and MoB 4 could not be synthesized by this method. Moreover, it was found that the particle size of finally prepared MoB is determined by particle size of raw Mo powder. The residual carbon content of the product could be decreased to 0.10 wt% after first reaction at 1673 K for 6 hours and then decarburization reaction at 1673 K for 6 hours.
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
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Zhao Liu,Yuxuan Liu,Huawei He,Hongbo Shao,Yi Zhang,Jing Li,Weiwei Cai
Hydrogen production by water splitting has the characteristics of clean, efficient, and strong operability. However, it is limited by the low activity and insufficient stability of cathode and anode catalysts. Therefore, cost-effective catalysts for efficient cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER) have to be developed. In this work, Ru/Mo 2 C heterojunctions are constructed to regulate the valence of Ru and Mo in the catalyst to simultaneously boost HER and OER in acidic conditions. Consequently, the overpotentials providing 10 mA/cm 2 HER and OER in the acidic electrolyte are reduced to 40 mV and 215 mV, respectively. Finally, only 1.51 V applied voltage is required to achieve 10 mA/cm 2 acidic overall water splitting. Taking stability into consideration, the Ru/Mo 2 C catalyst shows good application prospects in practical acid water electrolysis devices.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Tian Momang,Meng Ke-Juan,Xiong Kunyu,Hussain Iftikhar,Ma Xinwen,Zhang Kaili
Nanothermite has gained significant attention for its exceptional energy release rate and reactivity, making it a promising material for energetic applications. However, nanoparticle agglomeration significantly hinders its energy release efficiency. To overcome this challenge, we developed an innovative bottom-up strategy and a straightforward preparation method to construct a hierarchical Al/CuO/V 2 C nanocomposite. This is achieved through the ordered self-assembly of Al and CuO nanoparticles in an ethanol suspension, using V 2 C MXene as a template. Our findings show that the Al/CuO/V 2 C nanocomposite exhibits distinct morphologies based on V 2 C concentration: nanosheets at lower concentrations and microspheres at higher concentrations. CuO and Al nanoparticles form the first and second layers outside the V 2 C, respectively, due to the interplay between electrostatic forces and covalent Cu-O-V bonds. This unique structure, along with high reactivity of V 2 C, enables complete Al oxidation, achieving a heat release of 3156.2 J g -1 with a 10 wt% V 2 C addition—seven times greater than the Al/CuO control group. The concentration-dependent structure allows for tunable energetic performance, from a rapid 3-ms deflagration to a prolonged 16-ms combustion. Reduced gas release enhances safety, paving the way for applications in microinitiators and advancing nanothermite technology.
研究领域:
纳米材料
·
高能材料
·
自组装
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燃烧技术
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微型点火器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）