Ni/Y2O3/YSZ/CeO2/YBCO���³���Ĥ��֯������

 YBCO高温超导体有着广阔的应用前景，为改善其弱连接，通常要求强的c轴织构以提高临界电流密度值。通过RABiTS法可以在具有双轴织构的金属基底上外延生长出织构峰锐、组分单一的超导膜。为了减少晶格失配，通常需要在金属基体和超导层之间加入缓冲层。文章用2θθ扫描、扫描和ω扫描及极图法，对具有多层氧化物缓冲层的Ni/Y₂O₃/YSZ/CeO₂/YBCO 超导膜的织构进行了分析，表征了超导体由镍基带的立方织构经缓冲层的转动立方织构再到超导层的c轴织构的传递过程。     

Si3N4/Ti/Cu/Ni/Cu/Ti/Si3N4二次部分瞬间液相连接强度

采用Ti/Cu／Ni中间层对Si3N4陶瓷进行二次部分瞬间液相(PTLP)连接，研究连接工艺参数对Si3N4／Ti/Cu／Ni连接强度的影响，同时研究了连接强度随试验温度的变化规律。结果表明，在该试验条件下，室温连接强度随着二次连接温度的提高和二次保温时间的延长而提高，改变连接工艺参数对Si3N4／Ti/Cu／Ni二次PTLP连接界面反应层厚度无明显影响；连接强度在试验温度400℃时达到最大，随后随试验温度升高，连接强度降低，但在800℃前，其高温强度具有很好的稳定性。     

Si3N4/Ti/Cu/Ti/Si3N4部分瞬间液相连接界面动力学

采用Ti(5μm)／Cu(70μm)／Ti中间层，通过改变连接时间和连接温度进行Si3N4。陶瓷的部分瞬间液相连接(PTLP连接)，用扫描电镜、电子探针对连接界面区域进行了分析，系统地研究了Si3N4／Ti／Cu／Ti／Si3N4 PTLP连接过程的动力学。结果表明，界面反应层的生长和等温凝固界面的迁移均符合扩散控制的抛物线方程。PTLP连接参数的优化不同于通常的活性钎焊和固相扩散连接的参数优化,反应层生长和液相区等温凝固这两个过程必须协调，才能同时提高室温和高温连接强度。     

Cr/CrN/CrNC/CrC/Cr-DLC梯度膜层的研究

采用中频磁控溅射结合离子源技术沉积Cr／CrN／CrNC／CrC／Cr-DLC膜层。利用扫描电镜（SEM）、电子能谱（EDS）、Raman光谱和俄歇深层剥层分别对膜层微观形貌、成分组成、键结构及梯度成分深层分布进行分析；采用努氏显微硬度计、摩擦磨损试验机、划痕仪及洛氏硬度计测评膜层机械性能。结果表明：采用中频磁控溅射可沉积出大面积Cr／CrN／CrNC／CrC／Cr-DLC梯度膜层；Cr溅射功率对C键结构影响不大，但表层DLC中Cr的含量和膜层厚度随中频功率增大而增大；随DLC中掺Cr量增多，膜层硬度及摩擦因数略有上升；采用梯度过渡层及掺入金属Cr提高了膜层附着力，但过高的中频功率使沉积离子能量偏高，膜层压应力增加反而降低了膜层附着性能。     

Enhanced cycling stability of Mg–F co-modified LiNi0.6Co0.2Mn0.2–yMgyO2–zFz for lithium-ion batteries

The layered LiNi_0.6Co_0.2Mn_0.2–yMg_yO_2–zF_z (0≤y≤0.12, 0≤z≤0.08) cathode materials were synthesized by combining co-precipitation method and high temperature solid-state reaction, with the help of the ball milling, to investigate the effects of F–Mg doping on LiNi_0.6Co_0.2Mn_0.2O₂. Compared with previous studies, this doping treatment provides substantially improved electrochemical performance in terms of initial coulombic efficiency and cycle performance. The LiNi_0.6Co_0.2Mn_0.11Mg_0.09O_1.96F_0.04 electrode delivers an high capacity retention of 98.6% during the first cycle and a discharge capacity of 189.7 mA·h/g (2.8–4.4 V at 0.2C), with the capacity retention of 96.3% after 100 cycles. And electrochemical impedance spectroscopy(EIS) results show that Mg–F co-doping decreases the charge-transfer resistance and enhances the reaction kinetics, which is considered to be the major factor for higher rate performance. It is demonstrated that LiNi_0.6Co_0.2Mn_0.11Mg_0.09O_1.96F_0.04 is a promising cathode material for lithium-ion batteries for excellent electrochemical properties.     

塑料模CAE/CAD/CAM

1.概述在塑料模制造发展过程的初级阶段,主要依靠简单的机械加工设备和钳工工具等加工模具。加工塑料模型腔,在某种程度上主要由钳工按照塑件实样,用精雕细刻的方式进行加工。随着机械加工设备的不断发展和塑件形状的日益复杂化。在塑料模具制造业中出现了模具设计和模具制造的分工。即首先由模具设计人员按照塑件图进行模具设计,然后由模具加工人员根据模具零件图纸的要求,使用相应的设备进行加工。由机床的切削加工代替钳工的手工加工以后,不仅减轻了模具钳工的劳动强度,更主要的是加快了加工速度和提高了加     

Anisotropy of transport properties of layered superconductors Nd2? xCexCuO4 + δ and Ca2 ? xSrxRuO4

Temperature dependences of resistivity ρ _ab (T) and ρ _c (T) of single-crystal films Nd_{2 − x} Ce _x CuO_{4 + δ} (x = 0.12, 0.15, 0.17, 0.20) with orientations (001) and and single crystals Ca_{2 − x} Sr _x RuO₄ (0 ≤ x ≤ 2.0) have been investigated. It has been established that in the optimally annealed single crystal of Nd_{2 − x} Ce _x CuO_{4 + δ} (δ ≃ 0) and in single-crystal Ca_{2 − x} Sr _x RuO₄ the mechanisms of conduction differ in the orthogonal directions; namely, the conduction is metallic in the plane ab (dρ _ab /dT >0) and nonmetallic in the direction c (dρ _c /dT < 0). These layered quasi-two-dimensional systems are Anderson conductors with a strongly anisotropic localization radius (R _loc ^ab ≫ R _loc ^c ). It has been found that an increase in the oxygen content in the Nd_{2 − x} Ce _x CuO_{4 + δ} system and an increase in the calcium content in Ca_{2 − x} Sr _x RuO₄ lead to a decrease in the coefficient of the resistivity anisotropy. Thus, in these quasi-two-dimensional systems there occurs an Anderson transition caused by disorder. Original Russian Text ? A.I. Ponomarev, T.B. Charikova, G.I. Kharus, N.G. Shelushinina, A.O. Tashlykov, A.V. Tkach, A.A. Ivanov, 2007, published in Fizika Metallov i Metallovedenie, 2007, Vol. 104, No. 1, pp. 72–85.     

Spin-valve magnetoresistance in Co/Si/（Co/Cu/Co） multilayers

A series of Co/Si/（Co/Cu/Co） multilayers and Co/Si/Co sandwiches were prepared by high vacuum electron-beam evaporation. It was found that a Si spacer （≥0.9 nm） could greatly decrease the interlayer coupling in Co/Si/Co sandwiches and there was no magnetoresistance（MR） or spin-valve MR in them due to the high resistivity of Si spacer. While in Co/Si/（Co/Cu/Co） multilayers, we observed a spin-valve MR of about 0.5% through a nominal 2.7 nm Si spacer at room temperature. The spin-valve MR in Co/Si/（Co/Cu/Co） multilayers was attributed to the enhanced spin polarization of conduction electrons caused by the top Co/Cu/Co sandwich with GMR mechanism and high spin-dependent scattering at Co/Cu interface.     

压铸模CAD/CAE/CAM

介绍了压铸模CAD／CAE／CAM一体化技术的主要内容和实现CAD／CAE／CAM一体化的技术路线。实践应用表明，CAD／CAE／CAM一体化技术能有效地指导压铸模具的设计、模拟分析与制造过程，提高模具结构的合理性、准确性和加工精度，服务于实际压铸件生产。     

铜/不锈钢/镍复合板

作为小型电子机器用微型电池的负极容器材料,９０年代初开发成功的铜／不锈钢／镍复合薄板（复合比率Ｃｕ：１８Ｃｒ－８Ｎｉ－Ｆｅ：Ｎｉ＝１６：８２：２）,因其兼有优良的强度、深冲加工性、耐蚀性和低且稳定的接触电阻等综合特性,所以很快获得实用。但近年来对于电池的小型化和长寿命化的要求日益提高,为了增大电池内部容积就必须使复合板厚度尽量减薄（总厚度自０．２～０．３ｍｍ减薄为０．１５～０．１ｍｍ）、提高材料强度并改善成形性（减小各向异性）。这种复合薄板的中心层不锈钢占据总体积的一半以上,所以复合板的力学性能…     

Mo添加对Al19Fe20- x Co20- x Ni41Mo2 x 共晶高熵合金摩擦学性能的影响

研究了Al₁₉Fe_20-xCo_20-xNi₄₁Mo_2x（x=0,1,2,3,4,5）共晶高熵合金（EHEAs）的摩擦学性能。结果表明,添加微量Mo的EHEA可形成面心立方（fcc）+B2共晶组织,而添加相对较高含量Mo的EHEAs可形成fcc+B2+μ树枝状组织。Mo元素有利于提高L1₂相的强度和B2相的延性。然而,随着Mo含量的增加,生成的富Mo μ相降低了EHEAs的强度和塑性。Al₁₉Fe₁₈Co₁₈Ni₄₁Mo₄ EHEA具有高强度和高延展性的最佳组合。增加Mo含量可以提高EHEAs的抗氧化性。随着Mo含量的增加,EHEA在滑动过程中形成了抗氧化性增强的摩擦氧化物层,摩擦系数单调下降。本研究为Al₁₉Fe_20-xCo_20-xNi₄₁Mo_2x EHEAs的摩擦学性能研究提供了指导。