检索结果-南通市图书馆

Synchrotron radiation-based materials characterization techniques shed light on molten salt reactor alloys

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2020年第1期31卷 57-71页

作者： li Jiang Xiang-Xi Ye De-jun Wang zhi-jun li Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Ministry of Ecology and Environment Beijing 100135China

From a safety point of view, it is important to study the damages and reliability of molten salt reactor structural alloy materials, which are subjected to extreme environments due to neutron irradiation, molten salt corrosion, fission product attacks, thermal stress, and even combinations of these. In the past few years, synchrotron radiation-based materials characterization techniques have proven to be effective in revealing the microstructural evolution and failure mechanisms of the alloys under surrogating operation conditions. Here, we review the recent progress in the investigations of molten salt corrosion,tellurium(Te) corrosion, and alloy design. The valence states and distribution of chromium(Cr) atoms, and the diffusion and local atomic structure of Te atoms near the surface of corroded alloys have been investigated using synchrotron radiation techniques, which considerably deepen the understandings on the molten salt and Te corrosion behaviors. Furthermore, the structure and size distribution of the second phases in the alloys have been obtained, which are helpful for the future development of new alloy materials.

关键词： Molten salt reactor Alloy materials Synchrotron radiation Shanghai Synchrotron Radiation Facility Molten salt corrosion Tellurium corrosion

Effect of SiO2 substitution with Al2O3 during high-Al TRIP steel casting on crystallization and structure of low-basicity CaO–SiO2-based mold flux

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2020年第1期27卷 33-41页

作者： Ding-li Zheng Cheng-bin Shi zhi-jun li Jing li jung-wook Cho State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Division of Steelmaking Shougang Qian’an Iron and Steel Co.Ltd.Qian’an 064404HebeiChina Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyPohang 790-784Republic of Korea

The crystallization and structure of non-conventional lime-silica-based mold fluxes after undergoing slag-steel interaction in casting high-AI transformation induced plasticity(TRIP)steel were *** results showed that the crystallization temperatures of the mold fluxes decreased with decreasing the SiO2/Al2O3 ratio,and CaO/MnO2 ratio had an opposite effect on the crystallization *** crystalline phases precipitated in the mold flux were Ca4Si2O7F2 and *** SiO2/Al2O3 ratio and increasing CaO/MnO2 ratio in the mold fluxes have no influence on the types of crystalline *** dominant crystalline phase precipitated in each mold flux was Ca4Si2O7F2 with dendritic morphology,except for part of that with globular morphology in the mold flux without MnO2 ***4 crystals are distributed in the space among Ca4Si2O7F2 *** size of Ca4Si2O7F2 crystals in the slag with higher S1O2/AI2O3 ratio is smaller,which is attributed to the polymerization degree of the mold flux with increasing SiO2/Al2O3 ratio.[SiO4]-tetrahedral,[AlO4]-tetrahedral and T-O-T bending(T denotes Si or Al)depolymerized gradually with decreasing SiO2/Al2O3 ratio,and an opposite trend was observed for the case with increasing CaO/MnO2 *** polymerization degree of the mold fluxes decreased,which would result in the decrease in the viscosity of the mold fluxes.

关键词： Mold flux Crystallization Structure Continuous casting High-AI steel

Effect of long-term thermal exposure on microstructure of laser-welded UNS N10003 alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第11期35卷 73-81页

作者： Kun Yu Yuan Zhang Xiao-Dan Yuan li-Bin Zhao zhi-jun li Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Nuclear and Radiation Safety Center Beijing 100082China

The evolution of the microstructure and tensile rupture mechanism of laser welds in UNS N10003 alloy exposed to 700℃are *** M_(6)C carbides precipitate around the primary eutectic M_(6)C-γcarbides in the fusion zone after 100 h of *** long-term thermal exposure,the size of the fine M_(6)C carbides *** eutectic M_(6)C-γcarbides in the as-welded fusion zone transformed into spherical M_(6)C carbides as the exposure time extends to 10000 ***,the spherical M_(6)C particles exhibit size coarsening with increasing exposure *** tensile properties of the welded joints are not adversely affected by the evolution of eutectic M_(6)C-γcarbides and the coarsening of M_(6)C carbides.

关键词： UNS N10003 alloy Laser welding M_(6)C Long-term thermal exposure

Enhanced singlet oxygen generation by hybrid Mn-doped nanocomposites for selective photo-oxidation of benzylic alcohols

在线全文

学校读者我要写书评

暂无评论

Nano Research 2020年第6期13卷 1668-1676页

作者： zhi-jun li Shuya li Andrew Hunter Davis Elan Hofman Gyu Leem Weiwei Zheng Department of Chemistry Syracuse UniversitySyracuseNY13244USA Department of Chemistry State University of New York College of Environmental Science and ForestrySyracuseNY13210USA The Michael M.Szwarc Polymer Research Institute SyracuseNY13210USA

Transition-metal ions doped nanocrystals(NCs),specifically Mn-doped NCs,hold great potential in the field of photocatalysis,especially,to improve photocatalytic performance for singlet oxygen(1O2)***,we report the design of a novel Mn-doped NC-based nanocomposites,specifically,silica-coated Mn-doped CdS/ZnS NCs decorated with Pt NCs(denoted as Mn-NCs@SiO2-Pt),which enhance photocatalytic 1O2 *** to the long-lived Mn excited state(on the order of ms),the energy-transfer between Mn-NCs and molecular oxygen is facilitated with the assistance of the Pt NCs adhered to the Mn-NC@SiO2 ***,the Mn-NCs@SiO2-Pt composites,integrate the advantages of Mn-doped NCs,a protective silica layer,and Pt NCs to exhibit excellent catalytic activity and selectivity for the selective oxidation of primary benzylic alcohols to aldehydes through an 1O2 engaged oxidation process under visible-light *** work paves the way for enhancing catalytic performance via facilitated energy transfer relaxation by utilizing the long-lived excited-state of Mn2+dopant ions in nanocomposites.

关键词： doped nanocrystals energy transfer photocatalysis singlet oxygen selective oxidation

Effects of Si Addition and Long-Term Thermal Exposure on the Tensile Properties of a Ni–Mo–Cr Superalloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第8期28卷 951-957页

作者： Zhou-Feng Xu Jia-Sheng Dong li Jiang zhi-jun li Xing-Tai Zhou Thorium Molten Salts Reactor Center Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Institute of Metal Research Chinese Academy of Sciences

The effect of long-term thermal exposure on the grain boundary carbides and the tensile behavior of two kinds of Ni–Mo–Cr superalloys with different silicon contents（0 and 0.46 wt%） was investigated. Experimental results showed granular M2C carbides formed at the grain boundaries after exposure for 100 h for the non-silicon alloy. Furthermore, these fine granular M2C carbides will transform into plate-like M6C carbides as exposure time increases. For the Si-containing alloys,only the granular M6C carbides formed at the grain boundaries during the whole exposure time. The coarsening of the grain boundary carbides occurred in both alloys with increasing exposure time. In addition, the coarsening kinetics of the grain boundary carbides for the non-silicon alloy is faster than that of the standard alloy. The tensile properties of both alloys are improved after exposure for 100 h due to the formation of nano-sized grain boundary carbides. The grain boundary carbides are coarsened more seriously for non-silicon alloys than that of Si-containing alloys, resulting in a more significant decrease in the tensile strength and elongation for the former case. Silicon additions can effectively inhibit the severe coarsening of the grain boundary carbides and thus avoid the obvious deterioration of the tensile properties after a long-term thermal exposure.

关键词： Ni–Cr–Mo Silicon Carbides Mechanical properties

Investigation of regulating rheological properties of water-based drilling fluids by ultrasound

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2021年第6期18卷 1698-1708页

作者： Wei-An Huang Jing-Wen Wang Ming Lei Gong-Rang li zhi-Feng Duan zhi-jun li Shi-Fu Yu School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Sinopec Shengli Petroleum Engineering Co. Ltd.Drilling Technology Research InstituteDongying257017ShandongChina Oil and Gas Technology Research Institute of Changqing Oilfield Branch Xi'an710018ShaanxiChina Key Laboratory of Unconventional Oil&Gas Development China University of Petroleum(East China)Qingdao266580ShandongChina sPetroChina Daqing Oilfield Co. Ltd.Research Institute of Oil Production EngineeringDaqing163000HeilongjiangChina

Regulating rheological properties of water-based drilling fluids has always been a hot *** paper proposed a new method for regulating rheological properties of water-based drilling fluids by ultrasonic *** experimental results showed that the ultrasound increased the viscosity and yield point of bentonite suspension by reducing the particle size of clay,destroying the network structure between clay particles,increasing the mud yield and the cation exchange capacity of bentonite,and promoting the hydration dispersion of *** change of rheological property showed a memory effect at room temperature and high ***,the ultrasonic energy affected the network structure between clays and polymer chains,thus regulating the rheological properties of the bentonite-polymer *** two types of drilling fluids investigated,the rheology of the poly-sulfonate drilling fluid was regulated by damaging the grid structure between additives and clays by low-power ultrasound and reducing the clay particle size by high-power ultrasound,while the rheology of the deep-water drilling fluid was mainly regulated by disentangling the spatial grid structure between ***,ultrasound showed no effect on the lubricity,inhibition and stability of drilling fluids,which proved the feasibility of ultrasound to regulate rheological properties of water-based drilling fluids.

关键词： Ultrasound Suspension Water-based drilling fluid Rheological property

Absorption effect of pure nickel on the corrosion behaviors of the GH3535 alloy in tellurium vapor

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2021年第12期32卷 77-88页

作者： Kai Wang li Jiang Xiang-Xi Ye Jian-Ping liang Chao-Wen li Fang liu zhi-jun li School of Materials of Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

In this study,pure Ni was demonstrated to protect the GH3535 alloy from Te vapor corrosion because of its strong absorption *** Te corrosion of a single GH3535 alloy sample occurred in Te vapor at 700C,which manifested as complex surface corrosion products and deep intergranular ***,when pure Ni and the GH3535 alloy were put together in the vessel,the GH3535 alloy was completely protected from Te corrosion at the expense of the pure ***namic calculations proved that the preferential reaction between pure Ni and Te vapor reduced the activity of Te vapor considerably,preventing the corrosion of the GH3535 *** study reveals one potential approach for protecting the alloys used in molten-salt reactors from Te corrosion.

关键词： Tellurium corrosion Molten salt reactor GH3535 alloy Tellurides

Amphiphilic poly(ethylene glycol)-b-poly(ethylene brassylate)copolymers: One-pot synthesis, self-assembly, and controlled drug release

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2015年第10期26卷 1319-1321页

作者： Jiu-Cun Chen jun-zhi li Jian-Hua liu li-Qun Xu Institute for Clean Energy & Advanced Materials Southwest University State Key Laboratory of Medicinal Chemical Biology Nankai University Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies

A set of amphiphilic poly（ethylene glycol）-b-poly（ethylene brassylate）（PEG-b-PEB） copolymers based on the PEB hydrophobic block was first synthesized by ring-opening polymerization of ethylene brassylate with an organic catalyst. The EB/PEG molar ratios and reaction times were adjusted to achieve different chain lengths of PEB. Block copolymers that were characterized by1 H NMR and GPC could selfassemble into multimorphological aggregates in aqueous solution, which were characterized by DLS and TEM. The hydrophobic doxorubicin（DOX） was chosen as a drug model and successfully encapsulated into the nanoparticles. The release kinetics of DOX were investigated.

关键词： Poly(ethylene brassylate) Self-assembly Nanoparticles Controlled drug release

Fine structure characterization of an explosively-welded GH3535/316H bimetallic plate interface

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1811-1820页

作者： Jia Xiao Ming li Jian-ping liang li Jiang De-jun Wang Xiang-xi Ye Ze-zhong Chen Na-xiu Wang zhi-jun li School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Dalian National Laboratory for Clean Energy Dalian 116023China Ministry of Ecology and Environment Beijing 100135China Institute of Zhejiang University-Quzhou Quzhou 324004China

An explosion-welded technology was induced to manufacture the GH3535/316H bimetallic plates to provide a more cost-effective structural material for ultrahigh temperature,molten salt thermal storage *** microstructure of the bonding interfaces were extensively investigated by scanning electron microscopy,energy dispersive spectrometry,and an electron probe *** bonding interface possessed a periodic,wavy morphology and was adorned by peninsula-or island-like transition *** higher magnification,a matrix recrystallization region,fine grain region,columnar grain region,equiaxed grain region,and shrinkage porosity were observed in the transition zones and surrounding *** backscattered diffraction demonstrated that the strain in the recrystallization region of the GH3535 matrix and transition zone was less than the *** concentration occurred at the interface and the solidification defects in the transition *** dislocation substructure in 316H near the interface was characterized by electron channeling contrast imaging.A dislocation network was formed in the grains of *** microhardness decreased as the distance from the welding interface increased and the lowest hardness was inside the transition zone.

关键词： GH3535/316H bimetallic plate ultrahigh temperature molten salt explosive welding interface structure dislocation substructure