Z.H.Jiang 1)
,
Y.He 2)
,
X.L.Jiang 1)
,
G.J.Han 1) and S.S.Rui 1) 1) Department of Iron & Steel Metallurgy
,
School of Material and Metallurgical Science
,
Northeastern University
,
Shenyang 110006
,
China 2) Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China
金属学报(英文版)
The thermal conductivities of different typical species filling materials for sliding gate systems for steel ladles were measured using a hot wire technique, and the relationships between thermal conductivity and temperature were regressed. The factors affecting thermal conductivity were analyzed by using variance analysis for a perpendicular experiment. The effects of thermal conductivity on sliding gate free tapping were studied, and it was revealed that decreasing the thermal conductivity of the filling materials is beneficial in enhancing the rate of free tapping for sliding gates.
关键词:
filling materials
,
null
,
null
,
null
B.W. Wang
,
H. Shen
金属学报(英文版)
Ni-Cr System solar selective thin solid films were prepared by d.c. magnetron reactivesputtering under the atmosphere of O2 and N2. Ni-Cr alloy was chosen as targetmaterial and copper sheets as substrate. Using SEM, Spectrophotometer and Talystepto analyze the relations between the selective characteristic and the structure, theformation and the thickness of the thin films. The aim is to obtain good solar selectivethin films with high absorptance and low emittance, which is applied to flat plate solarheat collectors.
关键词:
solar selective thin film
,
null
,
null
,
null
G. Ya
,
X.Y Zhang and Y. L. Du(State Key Laboratory for Corrosion and Protection
,
Institute of Corrosion and Protection of Metals
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China)(Applied Chemistry Division of Sciences Institute
,
Shenyang Polytechnic University
,
Shenyang 110023
,
China)
金属学报(英文版)
It was proposed how the concentration distribution was calculated in the treble lager wall of hgdrogenation reactor according to the principle of hydrogen diffusion at the steady state in this paper. Based on the steady hydrogen permeation current density i∞ measund with the hydrogen probe at a given temperature, the hydmpen concentrationson the key interfaces and hydrogen distribution at any given mdial profile in the single, double or treble layer wall of hydrogenation reactor could be found by applying the presented equations throoph suitable parmeters ioput. The theoretical bases were provided for developing the nondestructive probing technique of the concentration of atomic hydmpen in the wallS of hydrogenation reactors.
关键词:
hydrogen permeation
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null
,
null
F.C.Zhang 1)
,
B.T.Hu 1)
,
L.X.Zhang 1) and C.F.Lin 2) 1) Department of Materials Science and Engineering
,
Yanshan University
,
Qinhuangdao 066004
,
China 2) Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China
金属学报(英文版)
Nano silicon particles can be become nano fibre under low energy electron beam bombarding. The formation of the nano silicon fibre include two stages. At first, on the nano silicon particle surface many silicon atoms are gasified, then these silicon atoms deposit in the place where have more charge on account of the static electrical absorption and the point effect of the charge accumulation , these atoms grow into non crystalline silicon fibres. The second stage is the non crystalline silicon fibres crystallizing. Its crystallizing temperature is about 180℃. The growth mechanism of the nano silicon fibre is vapour solid mode.
关键词:
nano fibre
,
null
,
null
X L Tian1)
,
Y M Sun1)
,
S X Zhao1)and X C Chen2) 1) College of Materials Science and Engineering
,
Shandong University of Technology
,
Jinan 250061
,
China2) Institute of Physics
,
The Chinese Academy of Sciences
,
Beijing 100081
,
China
金属学报(英文版)
Thethermal parameterofthe bulk amorphous Zr41 Ti14 Ni10 Cu12 5 Be22 5 alloy thermal dif fusivity,thermalcapacity andcoefficientofthermalconductivityatthestateofsolid andsu percooled liquid hasbeen measuredinthisstudy.It wasfoundthatthecoefficientofthermalconductivity and thethermalcapacity vary significantly with temperature. An error occursinthe measurementofthecoefficientofthethermalconductivity andthethermalcapacity us ing the method adoptedin this paper bothintheglasstransition processand when crystalliza tion processappears.
关键词:
Zr41Ti14Ni10Cu12 5Be22 5
,
null
,
null
Q. Y. Liu1
,
2) W. D. Fei2) and N. G. Liang1) 1) LNM
,
Institute of Mechanics
,
The Chinese Academy of Sciences
,
Beijing 100080
,
China 2) Schoolof Materials Science and Engineering
,
Harbin Institute of Technology
,
Harbin 150001
,
China
金属学报(英文版)
heinteracteach other among three kindsofthermalresidualstresses were analyzed firstly. Theresultsshown thatthe presenceof microstressandthermal mismatch stresshad noinflu enceon the measurement of macrostress, but macrostress can affect the measured value of thermal mismatch stress. Theeffectofthicknessofspecimen on thermalresidualstresses was discussed. Macrostresscan be neglected in thin specimen, thermal mismatch stressincreased with quenchingtemperatureincreasing, andobtainedtheir maximum valuesat400 ℃,then decreased . Forthethickspecimen, thecompressive macrostressatthesurfaceincreased with the quenching temperature increasing. The changing tendency of thermal mismatch stresswith quenchingtemperature wasquite differentcompared withthethinspecimens, which ob tainedtheir minimum valueat400℃.
关键词:
thermalresidualstresses
,
null
,
null
A.P.Zeng
,
Y.Xue
,
Y.F.Qian and Z.J.Wang Shanghai Institute of Metallurgy
,
The Chinese Academy of Sciences
,
Shanghai 200050
,
China
金属学报(英文版)
A no pollution organic acid based conversion coating solution MIS. No.1 has been examined as to its suitability as possible replacement for chromate containing formulations on magnesium alloys. Investigations have concentrated on the formation of passive film from simple MIS. No.1 solution using immersion. The morphology of passivated surfaces was examined using scanning electron microscopy (SEM). The corrosion resistance of the passivated surfaces and the painted surface was assessed using electrochemical techniques as well as humidity and salt fog tests. It was concluded that the surface treatment magnesium alloy by MIS.No.1 solution is more effective than that by chromate coating treatment, and the MIS.No.1 coating is also suitable for painting's pretreatment.
关键词:
non chromate conversion coating
,
null
,
null
,
null
K. Zhang and G.N. Chen Materials Center
,
Institute of Mechanics
,
The Chinese Academy of Sciences
,
Beijing 100080
,
China
金属学报(英文版)
The present investigation is aimed to understand the microstructure evolution of SiC p/Al Si composites, i.e. particle distribution and matrix microstructure in laser processing. Microstructures of SiC p/A356 composite and the monolithic alloy are comparatively studied through laser remelting process. It is observed that the particle remains its original distribution after re solidification, indicating rejection of particles by rapid solidification interface does not occur. The presence of particles does not lead to any change in the phase constitution and phase morphology in the matrix, but instead result in a considerable change in growth direction of primary phase. The underlying mechanism is rationalized based on the interplay between the particles and solidification interface.
关键词:
composites
,
null
,
null
