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Lu X.-W.,Changzhou University | Lu X.-W.,Key Laboratory of Advanced Metallic Materials of Changzhou City | Qian J.-C.,Jiangsu University | Chen F.,Jiangsu University | And 2 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012

Mesoporous CeO 2 with high specific surface area was synthesized using a modified evaporation-induced self-assembly (EISA) method, and a series of different amounts of Ag were loaded to this mesoporous CeO 2 by a modified ethylene glycol reduction route. The samples were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive spectrometry (EDS), nitrogen adsorption-desorption, Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH) methods. The mesoporous CeO 2 structure with different proportions of silver nanoparticles and its antibacterial activity were adequately studied, confirming that obtained novel materials show a good antibacterial effect. © 2012 The Nonferrous Metals Society of China.


Lu X.,Changzhou University | Lu X.,Key laboratory of advanced metallic materials of Changzhou city | Li X.,Changzhou University | Qian J.,Jiangsu University | Chen Z.,Suzhou University of Science and Technology
Powder Technology | Year: 2013

CeO2 nanowires were synthesized via a facile synthesis method using PEO-PPO-PEO (P123) as the surfactant. Thermo gravimetric analysis and differential scanning calorimetry (TG-DSC), Fourier transform infrared (FT-IR), X-ray diffraction (XRD), transmission election microscopy(TEM), selected election diffraction (SAED), energy-dispersive spectrometry (EDS), and Barrett-Joyner-Halenda (BJH), were employed to characterize the samples. The obtained CeO2 nanowires have the diameters of 10-50nm, the lengths of up to several micrometers, and some mesopores on the surface. CO conversion was used as a catalytic test reaction revealing that the activity of the nanowires was substantially higher than that of the commercial CeO2. © 2013 Elsevier B.V.


Lu X.,Changzhou University | Lu X.,Key Laboratory of Advanced Metallic Materials of Changzhou City | Li X.,Changzhou University | Qian J.,Jiangsu University | Chen Z.,Suzhou University of Science and Technology
Journal of Alloys and Compounds | Year: 2012

Ce 1-xLa xO 2-δ nanoparticles supported on the attapulgite nanocomposites were prepared by using hydrothermal synthesis method. The nanocomposites were characterized by powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive spectrometry (EDS), scanning electron microscope (SEM), and nitrogen adsorption-desorption. The results showed that the Ce 1-xLa xO 2- δ nanoparticles were attached to the surface of the attapulgite. The ATP/Ce 1-xLa xO 2-δ nanocomposites displayed the excellent catalytic activity for decomposing methylene blue. When La addition reaches x = 0.2, the decolorization ratio of methylene blue using ATP/Ce 0.8La 0.2O 1.9 as catalyst reached over 99%. © 2012 Elsevier B.V. All rights reserved.


Lu X.,Jiangsu University | Lu X.,Changzhou University | Lu X.,Key Laboratory of Advanced Metallic Materials of Changzhou City | Li X.,Changzhou University | And 5 more authors.
Journal of Alloys and Compounds | Year: 2016

Well-aligned CeO2/TiO2 nanotube arrays photocatalyst was successfully prepared by anodization and microwave homogeneous synthesis technique. The nanocomposites were characterized by X-ray diffraction(XRD), Raman spectroscopy(RS), scanning electron microscopy(SEM), energy-dispersive spectrometry(EDS), transmission electron microscopy(TEM), UV-vis diffuse reflection spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), photocurrent-time measurements, and electrochemical impedance spectroscopy(EIS). The TiO2 nanotube arrays showed enhanced optical properties with significant red shift after the introduction of CeO2 nanoparticles. Photocatalytic activities of the prepared samples were examined by the photocatalytic oxidation of benzothiphene (BT) under visible light irradiation. The CeO2/TiO2 nanotube arrays photocatalyst showed higher photocatalytic activity than that of TiO2 nanotube arrays. It was found that more than 90% of sulfur compounds in model oil were photocatalytic oxidized and removed by using CeO2/TiO2 nanotube arrays as photocatalyst. © 2015 Elsevier B.V. All rights reserved.


Wang Z.,Changzhou University | Wang Z.,Key Laboratory of Advanced Metallic Materials of Changzhou City | Wang Z.,Central South University | Li H.,Changzhou University | And 8 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2014

Isothermal hot compression tests of annealed Al-14Cu-7Ce alloy were carried out on Gleeble-3500 system in the temperature range from 573 K to 823 K and the stain rate range from 0.001 s-1 to 1 s-1. The resulted true stress-true strain data were employed to establish a constitutive equation for predicting high temperature flow stress. The results show that the flow stress follow well the rate equation ε̇=A DL Gb/κT[sinh(αLσ/G)]n. The effect of strain was taken into account by fitting of polynomials into the material parameters A, αL and n. The proposed constitutive equation can predict precisely high temperature flow stress of Al-14Cu-7Ce alloy. The control mechanism of hot deformation is dislocation climb. Copyright © 2014, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


Pan T.,Changzhou University | Pan T.,Key Laboratory of Advanced Metallic Materials of Changzhou City | He Y.,Changzhou University | Li J.,Changzhou University | Zhang B.,Changzhou University
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2014

The ability to form external chromia scales on binary Cu-Cr alloys with very small mutual solubility of the two components is strongly increased either by increasing Cr content or by preparing alloys with a very small grain size. The purpose of the present work is to mainly examine the effect of Cr content and especially the influence of the size of the second phase. Equal channel angular pressing (ECAP) was carried out for the grain refinement because it can often provide significant inner deformation and very fine grains. The oxidation behavior of binary Cu-Cr alloys with different nominal Cr contents (Cu-0.5Cr, Cu-7.0Cr and Cu-15.0Cr, atomic fraction, %) was investigated in air at 700 and 800°C. At the same time, the oxidation of grain-refined Cu-7.0Cr alloy was compared with the same casting alloy with a normal grain size in order to further reveal the effect of the grain refinement on the oxidation. The oxidation kinetics of all alloys followed the parabolic law. Oxidation of Cu-0.5Cr alloy was basically similar to that of pure Cu and its scales are mainly composed of copper oxides containing a small amount of chromia particles dispersed in the inner layer, even close to the scale/alloy interface. The oxide scales formed on the Cu-7.0Cr and Cu-15.0Cr alloys were complex and were consisted in most cases of the outer layer of CuO and Cu2O plus inner layer of mixed oxides of chromia and double Cu-Cr oxide of Cu2O · Cr2O3, leaving unoxidized Cr particles surrounded by chromia in the scales. Cr depletion was also observed in the alloy. The grain-refined Cu-Cr alloy easily formed more chromia with much lower oxidation rate. The oxidation rate of Cu-Cr alloys decreased considerably with increasing Cr content and reduction in size of b phase is favorable for improvement of anti-oxidation of Cu-Cr alloys. The result indicates that the alloy microstructure affects the oxidation behavior because microcrystalline structures provide numerous diffusion path for reactive Cr component, shorter diffusion distance and rapid dissolution of Cr-riched second phase. All of these favor the formation of the stable chromia. Therefore, it can be deduced that the growth law and microstructure of the oxide scales for the binary alloy are closely related to the reactive component contents, original microstructure, the size and spatial distribution of b phase in Cu-Cr alloys. © Copyright.


Li W.,Changzhou University | Li W.,Key Laboratory of Advanced Metallic Materials of Changzhou City | Li H.,Changzhou University | Li H.,Key Laboratory of Advanced Metallic Materials of Changzhou City | And 3 more authors.
Materials Science and Engineering A | Year: 2011

In order to find material parameters of established Zener-Hollomon constitutive equations and predict high-temperature flow stress of Al-14Cu-7Ce alloy, isothermal hot compression tests were conducted using a Gleeble 3500 thermomechanical simulator at constant stain rates of 0.001, 0.01, 0.1 and 1s-1 and at temperatures ranging from 300 to 550°C at intervals of 50°C. The effects of strain rate and temperature on hot deformation behavior were represented by Zener-Hollomon parameter including Arrhenius term. Four material constants α, n, A and activation energy Q in the equations were calculated by compensation of strain. The results show that the proposed constitutive equations give a precise estimate for high temperature flow stress of Al-14Cu-7Ce alloy, which means it can be used for numerical simulation of hot deformation process and for choosing proper deformation parameter in engineering practice accurately. © 2011 Elsevier B.V.


Shen J.,Changzhou University | Pan T.J.,Changzhou University | Pan T.J.,Key Laboratory of Advanced Metallic Materials of Changzhou City | Pan T.J.,Jiangsu Collaborative Innovation Center for Photovolatic Science and Engineering | And 3 more authors.
Corrosion Science and Protection Technology | Year: 2016

The corrosion of three Fe-xCr-5Al alloys containing 10%, 15% and 20%Cr(atomic fraction) is investigated beneath KCl-ZnCl2 deposits in air at 600 °C. Compared to their oxidation in air without salt films, all the alloys suffer from accelerated oxidation in the presence of salt deposits due to the dissolution of chromia in the chlorides. The corrosion resistance of the alloys could not be effectively improved by the additions of high Cr content. The accelerated corrosion of Fe-xCr- 5Al alloys induced by ZnCl2-KCl salts is attributed to the dissolution of the protective chromia in the melt, leading to the formation of loose and non-adherent scales on the surface of these alloys. The effect of Cr in Fe-Cr-Al alloys is clarified, and the accelerated degradation mechanism is also discussed in terms of the relevant thermodynamical phase stability diagrams. © 2016, Chinese Academy of Sciences. All rights reserved.

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