S. QI
,
N. M. POROTNIKOVA
,
M. V. ANANYEV
,
A. V. KUZMIN
,
V. A. EREMIN
,
A. A. PANKRATOV
,
N. G. MOLCHANOVA
,
O. G. REZNITSKIKH
,
A. S. FARLENKOV
,
E. G. VOVKOTRUB
,
Yu. P. ZAIKOV
中国有色金属学报(英文版)
doi:10.1016/S1003-6326(16)64421-7
制备了在燃料电池中作为密封剂使用的操作温度可达700~900°C 的 SiO2?Al2O3?BaO?MgO 和SiO2?Al2O3?ZrO2?CaO?Na2O 系玻璃陶瓷。采用同步热分析和高温膨胀测量技术，对所研究的玻璃陶瓷的热性能和其与燃料电池用材料(YSZ 电解质，合金连接器 Crofer22APU,15Х25Т)的匹配性能进行研究。采用原子发射光谱对玻璃陶瓷的元素成分进行分析。结果表明，45%SiO2?15%Al2O3?25%BaO?15%MgO 陶瓷的线膨胀系数为10.0×10?6°C?1，60%SiO2?10%Al2O3?10%ZrO2?5%CaO?15%Na2O 的为9.5×10?6°C ?1。采用扫描电镜对 YSZ/玻璃陶瓷/Crofer22APU 的界面结构进行分析。SiO2?Al2O3?BaO?MgO 玻璃中的硅酸盐相发生了晶化，采用拉曼光谱和X 射线衍射对晶化产物进行了分析。与非晶玻璃相比，所研究的玻璃陶瓷作为电化学或氧传感器中的密封剂使用时具有更佳的性能指标。而 SiO2?Al2O3?ZrO2?CaO?Na2O 低温非晶陶瓷可以作为燃料电池中的密封剂使用。
关键词:
玻璃陶瓷密封剂
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燃料电池
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YSZ
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Crofer22APU
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硅酸镁
Acta Chimica Sinica
Passive film formed on 304 stainless steel in 2.5 mol/L H2SO4 solution by using alternating voltage (A. V.) passivation have been investigated by measuring capacitance and photoelectrochemical parameters. The investigation of the effect of measure frequency on the slope of Mott-Schottky curve has been carried out. The photoelectrochemical measurements were consistent with the capacitance measurement. Analysis of the experimental results showed that the passive film formed 304 stainless steel by using A. V. passivation exhibits semiconducting properties. Using the simple model of semiconductor rather than the multi-donor level model can explain satisfactorily the semiconducting behavior of the film formed on 304 stainless steel by using A.V. passivation.
关键词:
A. V. passivation;passive film;semiconducting properties;stainless;steel;model;electrodes
Applied Physics Letters
Amorphous Ge1-xSx(x=0.61, 0.67, and 0.72) semiconductor alloys have been found formed by ball milling of powder mixtures of elemental Ge and S. The amorphization process and the ball-milled products have been investigated by x-ray diffraction, transmission electron microscopy, and Raman scattering. The results show that amorphous Ge-S alloys may form in a self-heating reaction, driven by the large heat of formation of amorphous and/or liquid Ge-S alloys. The structure of mechanically alloyed amorphous Ge-S alloys is similar to but not exactly identical with that of rapidly cooled amorphous Ge-S alloys. The amorphization transition mechanism reported is believed to be suitable for preparing other amorphous semiconductor alloys with similar thermodynamic conditions.
关键词:
magnetic-properties;ni-zr;amorphization;powders;transition;interdiffusion;germanium;systems;glasses;metals
Ting DU Longmei WANG Yeming WU Yuqing ZHANG Aisheng LIU Central Iron and Steel Research Institute
,
Beijing
,
100081
,
China
材料科学技术（英文）
The temperature dependences of the equilibrium constants for the reactions RES_((S))=[RE]+[S]. (RE=Ce,La,Nd,Sm,Y),of the standard Gibbs energies for the RES formed and of the interaction coefficients between RE elements and S for the Fe-base,Ni-base and Cu-base solutions are sum- marized.
关键词:
thermodynamics
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null
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null
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null
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null
Fatigue & Fracture of Engineering Materials & Structures
Fatigue data for welded joints subjected to an explosion treatment (ET) were obtained using rotary bending fatigue specimens. The fatigue fracture surfaces were observed by SEM and the dislocation morphologies by TEM. Mechanical properties have been quantitively studied by considering elastic and plastic shock wave characteristics. The test results indicate that the fatigue strength of welded joints subjected to ET is apparently improved due to the action of elastic or plastic stress waves while the ductility of the welded joints, i.e., reduction in area, is greatly increased.
关键词:
Applied Physics Letters
Transport in S(2) molecules sandwiched between Au electrodes is investigated with a combination of density functional theory and the non-equilibrium Green's function method. We consider four different configurations and find that their conductances are related to the details of the bonding geometry. When S(2) connects to pyramidal-shaped electrodes at the top site, the transmission is governed by a resonance and is strongly affected by the bias. In contrast, the transport of the remaining three configurations is through several closely spaced broad molecular orbitals, and the transmission coefficient is almost flat around the Fermi level. (C) 2012 American Institute of Physics. [doi:10.1063/1.3665614]
关键词:
conductance;molecule
孙新阁
,
霍立兴
,
张玉凤
腐蚀学报（英文）
采用楔形张开加载恒位移实验研究了X65管线钢在H2S溶液中的应力腐蚀开裂行为，并得出了X65管线钢母材、焊缝和热影响区的临界应力强度因子KISCC分别为55.7093 MPa•m 1/2、33.3189 MPa•m1/2和38.0711 MPa•m1/2；平台处的裂纹扩展速率da/dt分别为3.38×10－9m/s、3.5×10－9 m/s和3.5×10－9m/s.研究结果还表明，焊缝比母材具有更高的应力腐蚀敏感性.
关键词:
管线钢
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null
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null
