CHEMOSPHERE
·
2015
·
IF 3.34
Yunfei Zhang,Bo Yang,Yanni Han,Chaojin Jiang,Deli Wu,Jinhong Fan,Luming Ma
In this work, we tested a novel iron metal matrix composite (MMC) synthesized by mechanically introducing quartz sand (SiO 2 ) into an iron matrix (denoted as SiO 2 –Fe MMC). The pseudo-first-order reaction rate constant of the SiO 2 –Fe MMC (initial pH 5.0) for 20 mg/L of 2-chlorophenol (2-CP) was 0.051 × 10 −3 L/m 2 /min, which was even higher than that of some reported Pd/Fe bimetals. This extraordinary high activity was promoted by the quick iron dissolution rate, which was caused by the formation of Fe–C internal electrolysis from carbonization of process control agent (PCA) and the active reinforcement/metal interfaces during the milling process. In addition, pH has slight effect on the dechlorination rate. The SiO 2 –Fe MMC retained relatively stable activity, still achieving 71% removal efficiency for 2-CP after six consecutive cycles. The decrease in dechlorination efficiency can be attributed to the rapid consumption of Fe 0 . A dechlorination mechanism using the SiO 2 –Fe MMC was proposed by a direct electron transfer from Fe 0 to 2-CP at the quartz sand/iron interface.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Sciences-Basel
·
2020
·Vol. 10
·期 7
·2487
·
IF 2.474
Cijun Shuai,Yulong Li,Fang Deng,Youwen Yang,Shuping Peng,Fangwei Qi,Lida Shen
Iron (Fe) has attracted intensive attention as a bone implant material because of its inherent biodegradability, favorable biocompatibility and mechanical properties. Nevertheless, it degrades too slowly in a physiological environment, which limits its further clinical application. In this work, mesoporous carbon (MC) was introduced into Fe bone implant manufactured via a laser-additive manufacturing process. Particularly, MC possesses a noble standard corrosion potential and excellent electrical conductivity, thus acting as an effective cathode and activating micro-galvanic corrosion in the Fe matrix. More importantly, its high specific surface area enhanced the area ratio between cathode and anode, which further enhanced the galvanic corrosion effect. As a consequence, the corrosion rate was enhanced from 0.09 to 0.24 mm/year based on immersion tests. Besides, Fe/MC composite exhibited good cytocompatibility, as well as excellent mechanical properties. The positive results proved that the Fe/MC composite shows great potential as a bone implant.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Cong Li,Yefei Li,Juan Wang,Bo Li,Dawei Yi,Jing Shi,Qiaoling Zheng,Yimin Gao,Siyong Zhao
The preparation, microstructure and mechanical properties of ZTA particles reinforced Fe matrix composites (ZTA P /Fe composites) were systematically investigated. The X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) were used to analyze the microstructure and phase constituents, the hardness ( H) , Young's modulus ( E ) and plasticity factor ( δ A ) were determined as well. The nickel-chromium double-layer coated ZTA P of core-shell structure was prepared by electroless plating and multi-arc ion plating technologies. The modified ZTA P is consisted of the α -Al 2 O 3 , t -ZrO 2 , α -Cr and γ -Ni phases. In addition, the compressive strength of ceramic preforms is high due to a compact sintering neck formed among ZTA P during high temperature sintering . The preferred sintering process for ZTA ceramic preforms is determined as 1350 °C + 1 h, in this case the preforms show the remarkable porosity and highest compressive strength which are 27.8% and 35.0 MPa, respectively. The interfacial metallurgical chemical reactions occurred during infiltration casting process, which ensure the excellent metallurgical interfacial bonding of the ZTA P /Fe composites. The interface contains double transition layers, which refer to silicate and CrFe phases, respectively. The H , E and δ A of interfacial double transition layers were measured by the nano-indentation method, the values of which are situated between the ZTA P and iron matrix.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2025
·
IF 2
Yang Xia,Zhou Mojin,Sui Yudong,Li Pengfei,Jiang Yehua
ZTA (ZrO 2 toughened Al 2 O 3 ) ceramics are characterized by high wear resistance and high toughness, and are usually incorporated into metal matrix to enhance the wear resistance of the materials. In order to increase the wear resistance of iron, in this study, micrometer-scale ZTA reinforced iron matrix composites were prepared by hot-pressing sintering, and the effect of ZTA content on the wear resistance of the composites was investigated. The microstructure, microhardness and abrasive wear properties of the composites were investigated by scanning electron microscopy, microhardness tester, x-ray diffractometer and three-body abrasive wear tester as test methods, and the wear failure mechanism was also studied. The results showed that ZTA was uniformly distributed in the composites without obvious defects. The hardness and wear resistance of the composites were best when 12 wt.% ZTA was added. The maximum hardness of the composite was 296.62 HV, which was enhanced by 104% with respect to the matrix. And its relative wear resistance is 2.43 times higher than that of the iron matrix. The wear mechanism of the composites is mainly dominated by fatigue wear of the matrix and exfoliation of spalling pits and some ZTA particles, fatigue wear is the main wear mechanism of the composites.
研究领域:
材料科学
·
机械工程
·
复合材料
·
陶瓷材料
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Yupeng Wang,Xiangyuan Yu,Shulong Wen,Yihu Sun,Huibin Wei
The effective and economical removal of heavy metal-organic complexes remain an urgent challenge in the field of industrial wastewater treatment. In this study, Ca-doped ferrihydrite composites and Ca/Al co-doped ferrihydrite composites were synthesized via a simple one-step co-precipitation method and applied for the oxidative removal of EDTA-Cu in a hypochlorite system. The incorporation of Al significantly enhanced the material's stability. The Fe-Ca-Al composite exhibited a catalytic degradation efficiency of 97 % after 4 reaction cycles, representing a 32 % improvement compared to the Ca-doped ferrihydrite (Fe-Ca). Mechanistic studies revealed that the Fe-Ca-Al composite demonstrated strong selective adsorption of the organic moieties in EDTA-Cu over a broad pH range. Moreover, the oxygen vacancies (Ov) induced by Ca and Al co-doping played a crucial role in the enhanced catalytic performance and efficient removal of EDTA-Cu. These abundant Ov promoted electron transfer and provided numerous surface adsorption sites, facilitating the conversion of O 2 · - to 1 O 2 . Given that 1 O 2 can rapidly degrade organic compounds containing amino and carboxyl groups, it shows excellent potential for the treatment of EDTA-Cu. This study presents a highly active and reusable catalyst based on a Ca-Al doping strategy, offering a promising approach for the removal of organic-heavy metal complexes.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水污染控制
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IEEE TRANSACTIONS ON MAGNETICS
·
2019
·Vol. 55
·期 12
·1-7
·
IF 1.651
Wentao Hu,Xi’an Fan,Zigui Luo,Fan Luo,Guangqiang Li,Yawei Li,Jian Wang
Fe/ZrSiO4 composite compacts with high thermal stability and excellent soft magnetic performance were prepared successfully by mechanical milling and spark plasma sintering. The effect of ZrSiO4 content on microstructure and magnetic properties of the Fe/ZrSiO4 composite compacts was investigated in detail. ZrSiO4 could be coated uniformly on the surface of Fe particles. With the increasing ZrSiO4 content, the core losses are effectively reduced, but the effective permeability and the saturation magnetic magnetization gradually decrease, while the coercivity has shown the opposite trend accordingly. The composite compact with 7.5 wt% ZrSiO4 has shown the superior structure and soft magnetic properties such as high saturation magnetic magnetization (202.20 emu/g), stable effective magnetic permeability (29.39), and lower core loss (4.53 W . kg-1 at 5 kHz). The results indicated that the Fe/ZrSiO4 composite compacts had potential application prospects in electromagnetic conversion equipment at medium and high frequencies.
研究领域:
材料科学
·
磁性材料
·
粉末冶金
·
复合材料
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）