材料期刊网

Electrocatalytic Oxidation of Methanol and Ethanol by Carbon Ceramic Electrode Modified with Ni/Al LDH Nanoparticles

Ghasem KARIM-NEZHAD* , Sara PASHAZADEH , Ali PASHAZADEH

催化学报 doi:10.1016/S1872-2067(11)60452-X

A Ni/Al layered double hydroxide (LDH) nanoparticle modified carbon ceramic electrode (Ni/Al LDH/NMCC) was fabricated and used for the electrocatalytic oxidation of methanol and ethanol in alkaline media. Cyclic voltammetric (CV) studies showed that it gave a significantly higher activity for methanol and ethanol oxidation and can be used as an electrocatalytic anode for fuel cells. The kinetic pa-rameters of the electron transfer coefficient (α) and number of electrons involved in the rate determining step (nα) for the oxidation of methanol and ethanol were determined using CV. The anodic currents showed a linear dependence on the concentration of methanol and ethanol.

关键词: nickel , aluminium , layered double hydroxide , modified carbon ceramic electrode , electrocatalytic oxidation , methanol , ethanol

氢对Al和V在β纯Ti中扩散的影响

赵林若 , 张少卿 , 颜鸣臬

材料研究学报

本文采用扩散偶实验方法研究了氢对Al、V 合金元素在β纯Ti 中扩散的影响。结果表明,氢可以提高Al,V 的扩散系数,尤其使Al 的的扩散系数提高一个数量级。氢的这一作用被认为是氢在Ti 中的弱键效应所致。

关键词: 氢 , diffusion , titanium , aluminium , vanadium

沙漠浮土中可溶性盐对铝的大气腐蚀影响

郑弃非 , 孙霜青 , 温军国 , 李德富

中国腐蚀与防护学报

通过干湿循环加速试验模拟Al表面沉积沙漠浮土情况下的大气腐蚀过程，利用失重分析、扫描电镜（SEM）和大气腐蚀监测仪（ACM）研究浮土中可溶性盐对Al的大气腐蚀的影响。结果表明：浮土中的可溶性盐会使发生大气腐蚀的相对湿度范围变宽，随着可溶性盐含量的提高，Al的腐蚀不断恶化。在可溶性盐成分中，MgCl₂对Al的腐蚀影响最大，NaCl次之， MgSO₄和Na₂SO₄的影响较小。

关键词: 大气腐蚀 , aluminium , accelerated test , desert dust , soluble salt

Grain Boundary Sliding in Fatigue of Pure Aluminum

Wenlin HE , Qishan ZANG+ , Zhongguang WANG , State Key Laboratory for Fatigue and Fracture of Materials , Institute of Metal Research , Academia Sinica , Shenyang , 110015 , China

材料科学技术（英）

The distributions of plastic strain near grain boundaries induced by fatigue loading were investigated by the fiducial grid method in pure aluminum specimens, and the resulted grain boundary sliding (GBS) was systematically analysed. The results show that the strain field near a grain boundary is nonuniform. GBS is restricted by the junction of grain boundaries and causes discontinuities of both displacement and strain. A peak value of shear strain was created in short-range area across the grain boundary. GBS plays an important role in cyclic softening and secondary hardening. The control fac- tor of GBS is the relative orientation between two grains and the macro orientation of the grain boundary rather than the ∑ value of the boundary.

关键词: grain boundary sliding , null , null , null

Development of Some Fundamental Research of SiC_W/Al Composites in HIT PartⅠ Microstructure and SiC/Al Interface of SiC_W/Al Composites

Lin GENG Congkai YAO Dept.of Metals and Technology , Harbin Institute of Technology (HIT) , Harbin , 150006 , China

材料科学技术（英）

The microstructure of SiC whisker reinforced aluminium alloy (SiC_w/Al) composite is reviewed,and the SiC-Al interface in SiC_w/Al composite is especially discussed,The main contents are morphology of the aluminium matrix in SiC_w/Al composite;microstructures and defects of SiC whiskers in SiC_w/Al composite and bonding mechanisms of the SiC-Al interface in SiC_w/Al com- posite.

关键词: silicon carbide , null , null , null , null

Optimization and Calculation of the Al-Be-Si System

DU Yong Q.S.Ran JIN Zhanpeng G.Effenberg DING Wei Dept.of Materials Science and Engineering , Central-South University of Technology , Changsha , 410083 , ChinaMax-Planck-Institut fur Metallforschung , Institut fur Werkstoffwissenschaften , Heisenbergstrasse 5 , D-7000

材料科学技术（英）

Lattice stability of Be is estimated,and interaction parameters for the liquids in the Al-Be and Be-Si systems are obtained using phase dia- gram data from literatures.Using the obtained parameters and the lattice stabilities of Al and Si given in the literatures,the Al-Be and Be-Si phase diagrams are calculated.By means of Kohler's for- mula the Gibbs energy for the liquid phase in the Al-Be-Si ternary system is extrapolated.The calcu- lation shows that no excess ternary term is necessa- ry for the thermodynamic description of the system. The liquidus projection,isothermal section at 1273 K,as well as vertical sections at 94 and 88 wt-% Al and 2 wt-% Be are calculated.The calcu- lated results are in reasonable agreement with the experimental data available.

关键词: thermodynamics , null , null , null , null , null

Influence of Rolling Reductions on Recrystallization Texture in Commercially Pure Al

MAO Weimin University of Science and Technology , Beijing , 100083 , China.

材料科学技术（英）

The recrystallization texture in commercially pure Al is investigated after the samples are rolled differently and annealed.The samples with low rol- ling reductions could be generally recovered or recrystallized in situ and characterized by the re- tained G{110}<001>component.This recovery process decreases during annealing with the increase of reduction.The appearance of the B/R{359}. <132>and R{123}<634>components de- pending on the rolling reduction is investigated and the less developed Cube{100}<001>component in commercially pure ahninium is also discussed.

关键词: recrystallization , null , null , null

Effect of Calcium Treatment on Non-Metallic Inclusions in Ultra-Low Oxygen Steel Refined by High Basicity High Al2O3 Slag

钢铁研究学报(英文版)

关键词: 非金属夹杂物 , Al2O3 , 超低氧钢 , 钙处理钢 , 高碱度 , 钢包精炼炉 , 炉渣 , 精制

CAB Furnace Atmosphere Visualisation Using Computational Fluid Dynamics

材料热处理学报

关键词:

ICP-OES法测定芳纶绝缘纸中的钙、铁、铝

杨宗瑜 , 杨柳 , 谭帅霞 , 王进

绝缘材料

采用电感耦合等离子体发射光谱法(ICP-OES)同时测定芳纶绝缘纸中钙、铁和铝元素.讨论了不同处理方法对样品测定结果的影响,并对工作条件参数进行了优化,确定了最佳试验条件.结果表明:钙、铁和铝的检出限分别为0.021μg/mL、0.005 μg/mL和0.003 μg/mL,相对标准偏差为0.4％～4.1％,加标回收率为95.4％～103.0％.该方法准确,精密度高,满足日常检测要求.

关键词: 电感耦合等离子体发射光谱 , 芳纶绝缘纸 , 湿法消解 , 钙 , 铁 , 铝