Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material最新文献

英文中文

Structure and electrochemical properties of La, F dual-doped iLa0.01Mn1.99O3.99F0.01 cathode materials La, F双掺杂iLa0.01Mn1.99O3.99F0.01正极材料的结构与电化学性能

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

Pub Date : 2008-08-01 DOI: 10.1016/S1005-8850(08)60088-2

Meng Chen, Shengjun Li, Chuang Yang

引用次数: 7

Effects of Correlative Factors on the Interdendritic Melt Flow Brought by the Bulge in Continuous Casting Slabs 相关因素对连铸板坯胀形引起枝晶间熔体流动的影响

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

Pub Date : 2008-08-01 DOI: 10.1016/S1005-8850(08)60077-8

Shu-ying Chen, G. Chang, Jianzhong Wang, Chun-jing Wu

引用次数: 3

Effect of electromagnetic stirring on the microstructure and wear behavior of iron-based composite coatings 电磁搅拌对铁基复合涂层组织和磨损行为的影响

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

Pub Date : 2008-08-01 DOI: 10.1016/S1005-8850(08)60085-7

Jiangbo Cheng , Binshi Xu , Xiubing Liang , Yixiong Wu , Zhengjun Liu

The effect of electromagnetic stirring on the microstructure and wear behavior of coatings has been investigated. A series of iron-based coatings were fabricated by the plasma-transferred arc cladding process by applying different magnetic field currents. The microstructure and wear resistance of the composite coatings were characterized by scanning electron microscope (SEM), energy dispersive X-ray analysis (EDAX), X-ray diffraction (XRD), and wet sand rubber wheel abrasion tester. The experimental results showed that the microstructure of the coatings was mainly the γ-Fe matrix and (Cr, Fe)₇C₃ carbide reinforced phase. The coatings were metallurgically bonded to the substrate. With increasing magnetic field current, the amount of the block-like (Cr, Fe)₇C₃ carbide reinforced phase increased at first, reached a local maximum, and then decreased sharply. When the magnetic field current reached 3 A, the block-like (Cr, Fe)₇C₃ carbides with high volume fraction were uniformly distributed in the matrix and the coating displayed a high microhardness and an excellent wear resistance under the wear test condition.

研究了电磁搅拌对涂层组织和磨损行为的影响。通过施加不同的磁场电流，采用等离子体转移电弧熔覆工艺制备了一系列铁基涂层。通过扫描电子显微镜（SEM）、能谱X射线分析（EDAX）、X射线衍射（XRD）和湿砂胶轮磨损试验机对复合涂层的微观结构和耐磨性进行了表征。实验结果表明，涂层的微观结构主要为γ-Fe基体和（Cr，Fe）7C3碳化物增强相。涂层用冶金方法结合到基底上。随着磁场电流的增加，块状（Cr，Fe）7C3碳化物增强相的数量先增加，达到局部最大值，然后急剧减少。当磁场电流达到3A时，具有高体积分数的块状（Cr，Fe）7C3碳化物均匀分布在基体中，涂层在磨损试验条件下表现出高的显微硬度和优异的耐磨性。

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引用次数: 8

Desulfurizer desulphurization kinetics by the injection method 喷射法脱硫剂脱硫动力学

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

Pub Date : 2008-08-01 DOI: 10.1016/S1005-8850(08)60071-7

Wei Wu, Zhijun Han, Yanbin Hu, Wei Wu

To obtain a better desulphurization effect in hot metal, suitable desulfurizers should be selected first according to thermodynamics. However, the effect of desulphurization is also strongly affected by kinetics. The conditions of different desulfurizers (Mg, CaC₂, and lime) penetrating into hot metal, the rising up velocity in iron melt, residence time, and dissolving time are theoretically calculated and analyzed. The results are helpful to select the desulphurization process and equipment and to improve the desulphurization effect.

为了在铁水中获得更好的脱硫效果，应首先从热力学角度选择合适的脱硫剂。然而，脱硫效果也受到动力学的强烈影响。对不同脱硫剂（Mg、CaC2和石灰）渗入铁水的条件、铁熔体中的上升速度、停留时间和溶解时间进行了理论计算和分析。研究结果有助于脱硫工艺和设备的选择，提高脱硫效果。

引用次数: 4

Molecular dynamics simulation of Ni3Al melting Ni3Al熔融的分子动力学模拟

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

Pub Date : 2008-08-01 DOI: 10.1016/S1005-8850(08)60080-8

Rongshan Wang , Huaiyu Hou , Xiaodong Ni , Guoliang Chen

With the Voter-Chen version of embedded-atom model (EAM) potential and molecular dynamics, the melting of Ni₃Al alloy was simulated by one-phase (conventional) and two-phase approaches. It is shown that the simulated melting point is dependent on the potential and the simulation method. The structures of the melts obtained by different simulation methods were analyzed by the pair correlation function, the coordination number, and the distribution of atom pair type (indexed by the Honeycutt-Andersen pair analysis technique). The results show that the structures are very similar.

利用Voter Chen版本的嵌入原子模型（EAM）势和分子动力学，通过单相（传统）和两相方法模拟了Ni3Al合金的熔化过程。结果表明，模拟熔点与电势和模拟方法有关。通过对相关函数、配位数和原子对类型的分布（通过Honeycutt-Andersen对分析技术索引）来分析通过不同模拟方法获得的熔体的结构。结果表明，它们的结构非常相似。

引用次数: 2

Preparation of natural brucite nanofibers by the dispersion method 分散法制备天然水镁石纳米纤维

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

Pub Date : 2008-08-01 DOI: 10.1016/S1005-8850(08)60092-4

Li Xu, W. Ni, Wenping Li, Xingde Liu, Hailong Yang, Xiaoguang Yang

引用次数: 4

Damping properties of fly ash/epoxy composites 粉煤灰/环氧复合材料的阻尼性能

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

Pub Date : 2008-08-01 DOI: 10.1016/S1005-8850(08)60096-1

J. Gu, Gaohui Wu, Xiao Zhao

引用次数: 5

Corrosion Damage Evolution and Residual Strength of Corroded Aluminum Alloys 腐蚀铝合金的腐蚀损伤演变与残余强度

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

Pub Date : 2008-08-01 DOI: 10.1016/S1005-8850(08)60081-X

Youhong Zhang, G. Lv, Hui Wang, Bomei Si, Yueliang Cheng

引用次数: 5

Sulfation behavior of CuO/γ-Al2O3 sorbent for the removal of SO2 from flue gas CuO/γ-Al2O3吸附剂去除烟气中SO2的硫化行为

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

Pub Date : 2008-08-01 DOI: 10.1016/S1005-8850(08)60094-8

Qingchun Yu , Shichao Zhang , Xindong Wang , Jie Zhang , Zhenming Lu

CuO/γ-Al₂O₃ has been considered as a promising and recycling sorbent to remove sulfur dioxide from flue gas. In this study, a series of CuO/γ-Al₂O₃ sorbents with different CuO loadings were prepared by impregnation. The monolayer coverage of CuO supported on γ-Al₂O₃ determined by X-ray quantitative analysis was 0.275 g CuO/g (γ-Al₂O₃). Below the monolayer coverage, CuO was found highly dispersed on γ-Al₂O₃. Thermogravimetric technique was used to study sulfation kinetics and sulfation recycling. It was found that the Langmuir kinetic adsorption model described well the experimental data at the rapid sulfation region of the CuO/γ-Al₂O₃ sorbent. The adsorption activation energy was 19.98 kJ/mol and the pre-exponential factor was 9.97×10⁻⁵ s⁻¹ · Pa⁻¹. The CuO/γ-Al₂O₃ sorbent has shown good performance on regeneration, but long sulfation time might cause the deactivation of the CuO/γ-Al₂O₃ sorbent. It was also seen that the sulfated γ-Al₂O₃ support could not be reduced at 400°C.

CuO/γ-Al2O3被认为是一种很有前途的可循环利用的烟气脱硫吸附剂。本研究采用浸渍法制备了不同CuO负载量的CuO/γ-Al2O3吸附剂。通过x射线定量分析可知，γ-Al2O3上CuO的单层覆盖率为0.275 g CuO/g (γ-Al2O3)。在单层覆盖层下方，发现CuO高度分散在γ-Al2O3上。采用热重法研究了硫化动力学和硫化循环。结果表明，Langmuir动力学吸附模型较好地描述了CuO/γ-Al2O3吸附剂快速硫化区的实验数据。吸附活化能为19.98 kJ/mol，指前因子为9.97×10−5 s−1·Pa−1。CuO/γ-Al2O3吸附剂具有良好的再生性能，但磺化时间过长会导致吸附剂失活。在400℃时，硫酸酸化的γ-Al2O3载体不能被还原。

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引用次数: 7

Silicon assistant carbothermal reduction for SiC powders SiC粉体的硅辅助碳热还原

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

Pub Date : 2008-08-01 DOI: 10.1016/S1005-8850(08)60091-2

Kezhi Li, Jian-feng Wei, Hejun Li, Chuan-hui Wang, Gengsheng Jiao

引用次数: 12

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