检索结果-南通市图书馆

Interface reactions in film materials

在线全文

学校读者我要写书评

暂无评论

Journal of university of science and technology beijing 2003年第5期10卷 1-8页

作者： fengwu zhu, Zhonghai Thai, and Guanghua Yumaterials science and engineering school, university of science and technology beijing, beijing 100083, china materials science and engineering school University of Science and Technology Beijing Beijing 100083 China

Interface reaction (IR) is a frequently observed phenomenon in the study ofadvanced thin film materials. It is very important to study the reaction conditions at which IRhappens and then to suppress or make use of it, the necessary conditions, including boththermodynamical and dynamical conditions of IR were discussed in detail. IRs in various systems,including oxide/silicon, oxide/metal, metal/metal, metal/semiconductor andsemiconductor/semiconductor, were reviewed. Methods to suppress and make use of IR were alsointroduced.

关键词： interface reaction spin-valve multilayers gate dielectric

Sticking-up Behaviors and Surface Friction of IF Electrogalvanized Sheet Steel in Forming

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and materials 1999年第1期13卷 61-63,68页

作者： Jiming Hu Jixun Wu Yanping Lu Yanrong zhu (Material science and engineering school, university of science and technology beijing, beijing 100083, china) Univ of science and technology Beijing Beijing China

X-ray diffraction (XRD), ball-disc friction and wearing machine and draw-bead test were introduced to investigat the strcusture and workability of IF sheet steel electrogalvanized deposits prepared from sulphate solution system. It was shown that the picking-up of the zinc coating on die strengthened with the increasing of friction factor which was originally affected by the coating's structure. Duing forming, (00X) planes (X= 2, 4) preferential orientation of zinc deposits increased, which resulted in enhanc ing the coating's friction behaviors. Therefore, the forming mechanism of electrogalvedzed deposit was demonstrated that both friction and the stricking -up behaviors of the coating are intensified simultaneously and affect each other.

关键词： electrogalvanized deposit forming friction factor

Hot Corrosion of Iron in the Presence of Salt Mixture Deposit Containing NaCl and V_2O_5 at 600℃

在线全文

学校读者我要写书评

暂无评论

Journal of materials science & technology 1996年第6期12卷 445-451页

作者： Lingchuan LI (Dept. of materials science and engineering, Tsinghua university beijing 100084, china)Rizhang zhu (Dept. of Surface science and Corrosion engineering, university of science and technology beijing, beijing 100083, china)(To whom correspondenc Dept. of materials science and engineering Tsinghua University Beijing 100084 China Dept. of Surface science and Corrosion engineering University of Science and Technology Beijing Beijing 100083 China Instiuto di Chimica Facolta di Ingegneria Università di Genova Fiera del Mare Pad.D 16129 Genova Italy

Iron suffered low temperature hot corrosion (LTHC) in the presence of salt deposits of Na2SO4,Na2SO4 mixed with NaCl and Na2SO4 mixed with V2O5 in a combustion gas at 600℃. The additions of NaCl to Na2SO4 and of V2O5 to Na2SO4 changed the corrosion kinetics significantly and modified the scale structure markedly It is proposed that trivalent iron ions were more favored than divalent ions in the eutectic responsible for the occurrence of LTHC when NaCl was present, while the reaction between Na2SO4 mixed with V2O5 and the gas formed (Na2O)xV2O4(V2O5)6-x providing directly the liquid required by LTHC. The suphide formation in the inner FeO larer was related to the sites of the reduction step wher SO2 was released.

关键词： SO NaCl

The influence of thermal radiation on MHD station-point flow past a stretching sheet with heat generation

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2011年第4期27卷 502-509页

作者： Jing zhu.Lian-Cun Zheng.Xin-Xin Zhang Department of Mathematics and Mechanics,university of science and technology beijing,100083 beijing,china Thermal engineering Department,university of science and technology beijing,100083 beijing,china Zheng Department of Mathematics and Mechanics University of Science and Technology Beijing Beijing China Thermal engineering Department University of Science and Technology Beijing Beijing China

This letter is concerned with the plane and axisymmetric stagnation-point flows and heat transfer of an electrically-conducting fluid past a stretching sheet in the presence of the thermal radiation and heat generation or absorption. The analytical solutions for the velocity distribution and dimensionless temperature profiles are obtained for the various values of the ratio of free stream velocity and stretching velocity, heat source parameter, Prandtl number, thermal radiation parameter, the suction and injection velocity parameter and magnetic parameter and dimensionality index in the series form with the help of homotopy analysis method （HAM）. Convergence of the series is explicitly dis- cussed. In addition, shear stress and heat flux at the surface are calculated.

关键词： Thermal radiation MHD Laminar boundarylayers - Homotopy analysis method

Chemical states of the atoms in magnetic multilayers Ta/NiO_x/Ni_(81)Fe_(19)/Ta and Co/AlO_x/Co

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 2002年第4期47卷 276-279页

作者： YU Guanghua, zhu fengwu & CHAI ChunlinDepartment of materials Physics, university of science and technology, beijing 100083, china Department of materials Physics University of Science and Technology Beijing China

Ta/NiOx/Ni81Fe19/Ta and Co/AlOx/Co multilay-ers were prepared by rf reactive and dc magnetron sputter-ing. The exchange coupling field (Hex) and the coercivity (Hc) of NiOx/Ni81Fe19 as a function of the ratio of Ar to O2 during the deposition process were studied. The composition and chemical states at the interface region of NiOx/NiFe were also investigated using the X-ray photoelectron spectroscopy (XPS) and peak decomposition technique. The results show that when the ratio of Ar to O2 is equal to 7 and the argon sputtering pressure is 0.57 Pa, the x value is approximately 1 and the valence of nickel is +2. At this point, NiOx is anti-ferromagnetic NiO and the corresponding Hex is the largest. As the ratio of Ar/O2 deviates from 7, the Hex will decrease due to the presence of magnetic impurities such as Ni+3 or metallic Ni at the interface region of NiOx/NiFe, while the Hc will increase due to the metallic Ni. Al layers in Co/AlOx/Co multilayers were also studied by angle-resolved XPS. Our finding is

关键词： NiOx/NiFe exchange coupling Co/AlOx/Co X-ray pho-toelectron spectroscopy (XPS) chemical states.

Study on Tribological Properties of the Rolling Fluid Containing Nano-MoS_2 for Cold Rolling of Steel Strip

在线全文

学校读者我要写书评

暂无评论

china Petroleum Processing & Petrochemical technology 2011年第1期13卷 64-69页

作者： zhu Guangping Sun Jianlin Wang Bing Wang Yizhu (school of materials and engineering,university of science and technology beijing,beijing 100083) Univ Sci & Technol beijing Sch Mat & Engn Beijing 100083 Peoples R China

The nano-MoS2 particles were adopted to substitute for the extreme-pressure and anti-wear additives to the rolling fluid for steel *** optimal formulation and technical process for adding nano-MoS2 particles to the rolling fluid were obtained through orthogonal experiments with three factors at three *** tests have led to the following conclusions:(a) the nanoparticles should be added to a base oil with high saponification value;(b) the concentration of nanoparticles in rolling fluid should be equal to 0.6%;and (c) when the reaction time needed for surfactants (oleic acid,for example) to modify the nanoparticles was 40 min,the rolling fluid could have the best tribological *** lubricity of rolling fluid was verified by using a 4-high cold rolling test mill which showed that the rolling fluid with nano-MoS2 particles had the excellent lubricant performance to improve the surface quality of the steel strip *** mechanism of nano-MoS2 particles in the rolling process has been investigated by a series of characterization instruments,which have showed that,with its fullerene-like structure,the nano-MoS2 particles have self-lubricating properties and extra-low friction coefficient,and can easily form a protective film with low shear strength on the surface of friction pairs.

关键词： cold rolling nano-MoS2 strip rolling fluid mechanism

Structure and magnetic properties of vacuum annealed FePt/Ag nano-multilayers

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 2003年第3期48卷 236-238页

作者： YANG Tao, YU Guanghua, HWANG Pol & zhu fengwu Department of materials Physics, university of science and technology beijing, beijing 100083, china Department of materials Physics University of Science and Technology Beijing Beijing 100083 China

FePt/Ag)n nano-multilayers were deposited on MgO(100) single crystal with laser ablation and then sub-jected to annealing. FePt L10 grains with (001) texture and a large perpendicular magnetic anisotropy constant Ku of the order of 106 J/m3 were formed. A thick Ag layer is found to be favorable for improving the (111) preferential orientation and decreasing the dispersion of the easy axis for magnetiza-tion. The measurement of time decay of magnetization gave rise to an activation volume as small as 6×10-25 m3, showing the promising perspective of being the recording medium for future high density perpendicular recording.

关键词：磁记录介质真空封装 FePt/Ag纳米复合薄膜结构磁学性质

Preparation of titanium oxycarbide from various titanium raw materials:Part *** reduction

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2010年第6期29卷 547-551页

作者： GAO Chengjun,JIANG Bo,CAO Zhanmin,HUANG Kai,and zhu Hongmin school of Metallurgical and Ecological engineering,university of science and technology beijing,beijing 100083,china school of Metallurgical and Ecological engineering University of Science and Technology Beijing Beijing China

Carbothermal reduction was performed at temperatures up to 1600°C for vanadium-bearing titanomagnetite,ilmenite concentrate,and high titania *** possibility of selective carbothermal reduction was discussed in detail from the viewpoint of thermodynamics,and also *** products were analyzed by X-ray diffraction,scanning electron microscopy,and chemical *** results show that it is possible to reduce all iron oxide to metallic iron,and titania to oxycarbide（TiCxOy）,without the reduction of other oxides like silica and magnesia.

关键词： titanium carbothermal reduction oxycarbide ilmenite

The Effect of Nb on Mechanical Properties of Quenching and Partitioning Steels

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第S1期18卷 306-309页

作者： zhu Shuai,KANG Yong-lin,REN Kang-kang,WANG Chuan (school of materials science and engineering.university of science and technology beijing,beijing 100083,china) Univ Sci & Technol beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China

In order to study the effect of alloy elements on mechanical properties of quenching and partitioning steels,the Q and P heat treatments on different chemical composition steels were carried on in *** tensile test results indicated the strength of Nb+Ti-bearing steel was not increasing as expected,but lower than that of the Nb+Ti-free steel,and the elongation was raised to 26% from 9%.The Nb+Ti-bearing steel microstructures after tensile test were detected by TEM and found a certain amount of twins in the deformed microstructure while the deformed microstructure mainly was lath martensite in Nb+Ti-free steel,which means the addition of Nb and Ti elements could cause the twinning induced plasticity by inhibiting the phase transformation from austenite to *** on above analysis,adding trace Nb element could greatly increase the stacking fault energy of the retained austenite,which is beneficial to the formation of twins,and the formation of twins would lower the strength slightly and raise the elongation drastically.

关键词： quenching and partitioning twinning induced plasticity niobium stacking fault energy