从硫酸盐溶液中选择性回收Cd（Ⅱ）

L．Gotfryd等研究了从沉淀碳酸镉或镉胶结海绵及含其他组份，如锌的重度污染物的浸出液中液-液萃取镉（Ⅱ）。溶液首先净化，通过氧化水解去除铁和其他污染物，等浓度的二异丙基水杨酸和Cyanex471X混合物（0．5mol／l＋0．5mol／l）用Solvesso 150稀释后用作萃取剂。试验既以实验室模拟逆流体系，也用混合澄清器以连续逆流方式进行，都获得了良好的Cd（Ⅱ）和Zn（Ⅱ）的分离效果。     

（Sm_（1－x）Y_x）_2Fe_（17）N_y的Mossbauer谱研究

通过Ｍｏｓｓｂａｕｅｒ谱等研究（Ｓｍ１－ｘＹｘ）２Ｆｅ（１７）Ｎｙ的磁性。结果表明：Ｓｍ次格子的单轴各向异性较强，对总的各向异性贡献起主导机制；Ｙ原子的择优占位导致晶体结构的变化，而对各向异性的影响较小。     

Co_（66）Fe_4Mo_2Si_（16）B_（12）非晶合金的晶化及磁性的研

本文研究了Ｃｏ６６Ｆｅ４Ｍｏ２Ｓｉ１６Ｂ１２非晶合金在６５３Ｋ～８１３Ｋ之间的不同温度退火后的晶化及磁性的变化。实验结果表明，随着退火温度升高，试样的初始磁导率明显上升，当Ｔａ＝７５３Ｋ时，合金开始晶化，析出Ｃｏ２Ｓｉ、Ｃｏ２Ｂ、Ｃｏ３Ｂ，其磁导率明显降低，但仍具有较高的磁感应强度；当退火温度继续提高，合金中析出的Ｃｏ２Ｓｉ、Ｃｏ２Ｂ、Ｃｏ３Ｂ的量增多，同时析出ｆｃｃＣｏ相，合金的软磁性能变得很差。     

直流PCVDTi（CxN1—X）硬质膜及其应用

对不同成分的PCVD－Ti（CXN1－X）膜的组织结构及性能进行了研究。结果表明，Ti（CN）膜的高硬度、高致密组织和膜表面因吸附氧而形成的与TiN不同的表面结构是Ti（CN）膜性能优于TiN膜的重要因素。在冷挤压模上应用结果也表明，用PCVD法制备的Ti（CN）膜和TiC膜的使用效果要比TiN膜好得多。     

Ni_（47）Ti_（44）Ta_9合金显微组织的TEM研究

采用透射电镜（ＴＥＭ）研究了Ｎｉ４７Ｔｉ４４Ｔａ９合金中马氏体和β－Ｔａ相的形貌及精细组织。结果表明，马氏体主要呈细板条状和群团状两种形貌，其亚结构为孪晶；β－Ｔａ相粒子呈椭球状分布于ＴｉＮｉ基体中，其内部存在大量位错和孪晶。     

Adsorption properties of Ag（Ⅰ）, Au（Ⅲ）, Pd（Ⅱ） and Pt（Ⅳ） ions on commercial 717 anion-exchange resin

The adsorption properties of the four precious metal ions (Ag(I), Au(II), Pd(III) and Pt(IV)) on the commercial Cl^?-form 717 strongly basic anion-exchange resin were studied in detail. The effects of the contact time, solution acidity, and concentrations of Cl^? and Pb²⁺ ions on the adsorption properties were studied by the batch method. Then, the column method was conducted under the optimized adsorption conditions (pH=3.0). The effects of the sample loading flow rate and the length-to-diameter ratios of the columns were investigated. The precious metal ions adsorbed could not be eluted completely after the saturated adsorption because the precious metal ions were found to be reduced to their metallic states during the adsorption process. So, it is recommended that the commercial Cl^?-form 717 strongly basic anion-exchange resin should be decomposed directly to recovery the precious metals after the saturated adsorption.     

金属前驱体区域选择性原子层沉积机制

基于区域选择性原子层沉积(AS-ALD)技术的自下而上制造工艺近年来在半导体、催化剂等领域得到了迅速发展.AS-ALD本质上是在同种材料的不同位点或异种材料表面实现目标产物在生长区域的选择性沉积,并且抑制在非生长区域的沉积.目前,实验上已经发展了多种表面抑制、活化技术,或者利用材料表面不同位点的固有差异实现金属前驱体的...     

选择性激光烧结技术在医学上的应用

简述了选择性激光烧结技术(SLS)和熔化技术(SLM)的成型原理及其在生物医学领域的应用,重点介绍了SLS在医学模型、植入体和赝复体、组织工程支架及药物传送装置等方面的应用,并对SLS和SLM技术的研究与发展方向进行展望。     

气动三联件106（108）系统阀体加工自动线

介绍了气动三联件106（108）系统阀体加工自动线的整体方案及线上采用的关键技术，并且对部分主要部件及控制系统件了较详细的叙述。     

MICROSTRUCTURE AND MECHANICAL PROPERTY DEVELOPMENT IN THE SIMULATED HEAT AFFECTED ZONE OF V TREATED HSLA STEELS

The simulated heat affected zone （HAZ） of the high strength low alloy （HSLA） steels containing 0%, 0.047%, 0.097% and 0.151% vanadium, respectively, were studied with Gleeble-2000 thermomechanical simulator to determine the influence of vanadium addition on the mechanical properties of the HAZ. The HAZ simulation involved reheating the samples to 1350℃, and then cooling to ambient temperature at a cooling rate of 5℃/s ranging from 800 to 500℃ （△8/5=60s）. The mechanical properties including tensile strength and -20℃ impact toughness were conducted. The microstructures of the base steel and the simulated HAZs were investigated using optical microscope, scanning electron microscope （ SEM ） and transmission electron microscope （TEM）. Based on the systemutic examination, the present work confirmed that about 0.05% vanadium addition to low carbon low alloy steels resulted in expected balance of strength and toughness of the HAZ. And more than 0.10% levels addition led to detrimental toughness of the HAZ SEM study showed that the simulated 0.097% and 0.151%V HAZs consisted of more coarse ferrite plates with greater and more M-A constituents along austenite grain and ferrite plate bound- aries. The impact fracture surfaces of the simulated 0.097% and 0.151%V HAZs showed typically brittle mode with predominant cleavages. The size of the facet in the fracture surface increased with increasing vanadium level from 0.097% to 0.151%.As a result, the simulated 0.151% V HAZ has the lowest impact toughness of the four specimens.     

Mechanism for phase boundary sliding and its relevance to diffusion-solution zone in SPD

1　ＩＮＴＲＯＤＵＣＴＩＯＮＳｉｎｃｅｔｈｅｄｉｓｃｏｖｅｒｙｏｆｓｕｐｅｒｐｌａｓｔｉｃｉｔｙ ,ｐｅｏｐｌｅｈａｖｅｉｎｖｅｓｔｉｇａｔｅｄｈｕｎｄｒｅｄｓｏｆｓｕｐｅｒｐｌａｓｔｉｃｍａｔｅｒｉａｌｓｉｎｃｌｕｄｉｎｇｐｏｌｙｃｒｙｓｔａｌｃｅｒａｍｉ     

The softening prediction of HSLA steel heat-affected zone based on the grey system

The high-strength low-alloy( HSLA ) steel heat-affected zone (HAZ)softening was predicted using a grey model.HSLA steel DILLIMAX690E,NK-HITEN610U2 and BHW35 were taken as examples in the research on ul...     

Ti(C_(1-x)N_x)粉末制备工艺研究

研究了碳热还原反应制备Ti(C1-xNx)时,原料成分C/Ti配比、反应温度、保温时间、氮气流量等因素对x值的影响。根据金属陶瓷产品的性能要求,通过准确控制这些因素,可制备出成分优良的不同Ti(C1-xNx)陶瓷粉末。制备了三种C﹑N成分含量的Ti(C1-xNx)粉末,并分别通过XRD衍射和SEM电镜扫描研究了它们的组织结构与形貌特征,找出了x值对Ti(C1-xNx)粉末晶格常数的影响规律,随着Ti(C1-xNx)中固溶N的含量的增多,其晶格常数逐渐变小。     

高振实密度球形LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2粉末的合成及性能

以共沉淀法制备的球形Ni_(0.5)Co_(0.3)Mn_(0.2)CO_3粉末为前驱体,按一定的比例将碳酸锂与前驱体混合,然后采用高温固相法合成高振实密度球形LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2正极材料.该材料的振实密度达到2.60 g/cm~3,与商品化LiCoO_2的密度相当.SEM分析表明, LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2正极材料与前驱体形貌有良好的继承性,均为理想的球形.XRD物相分析表明,在不同合成温度下的Li Ni_(0.5)Co_(0.3) Mn_(0.2)O_2产物均为具有α-NaFeO_2层状结构的纯相物质,在较高合成温度下所得材料的结晶度较高.电化学性能研究表明,在2.7～4.3 V的电压范围内,电池的放电比容量在0.2C倍率下为168.1 mA-h/g,在1C倍率下为157.6 mA-h/g;经50次循环后,两种放电条件下的电池容量保持率分别为95.1%和97.2%,显示出良好的电化学性能.     

TiC(110)表面第一性原理研究(英文)

利用基于密度泛函理论的第一性原理平面波赝势法计算TiC(110)表面的结构和电子特性。对于该表面结构弛豫和表面能的计算结果表明,7层原子构型能够显示TiC的内部体相特征,弛豫后结构的变化仅发生在顶部3层,证明弛豫只影响构型的顶部3层。同时,从构型的(100)平面上的电荷密度分布中可以看到强烈的Ti—C共价键。弛豫后,由于电荷在真空层中的消耗和第一、第二层原子层之间的积累,第一、第二层原子间距减小,Ti—C化学键相应地增强。计算得到的TiC(110)表面的表面能为3.53J/m2。     

(1,5-环辛二烯)氯化钌(II)多聚体的合成及表征

在无水乙醇介质中,将水合三氯化钌与1,5-环辛二烯加热回流,一步合成了(1,5-环辛二烯)氯化钌(II)多聚体[Ru(cod)Cl2]n,产率96%。用元素分析、核磁共振(¹H-NMR、¹³C-NMR)和红外光谱(IR)等分析表明产物为目标化合物。     

二次热循环对X100管线钢粗晶热影响区组织与性能的影响

通过热模拟技术与显微分析方法研究了二次热循环对X100管线钢粗晶热影响区组织的影响规律,再热粗晶区的性能通过夏比V型缺口冲击试验表征。试验结果表明,当二次热循环的峰值温度处于(α+γ)两相温区,试验钢的临界粗晶热影响区出现局部脆化。局部脆化的原因主要有两个:一是临界粗晶热影响区组织粗化;另一是该区MA组元数量多,尺寸大,硬度高。     

快速凝固粉末冶金Mg_(80)Cu_(10)Y_(10)合金的组织与力学性能

采用快速凝固粉末冶金技术制备热挤压Mg_(80)Cu_(10)Y_(10)合金棒材,研究了快速凝固Mg_(80)Cu_(10)Y_(10)合金薄带及热挤压后合金的相结构,并对热处理工艺对合金棒材组织结构及力学性能的影响进行了分析.研究表明,采用单辊快速凝固法在辊速为1800 r/min下制备的Mg_(80)Cu_(10)Y_(10)合金薄带为完全非晶态;在热挤压过程中Mg_(80)Cu_(10)Y_(10)合金中有Mg_2Cu和Mg晶体相析出,其显微硬度比薄带有所提高,这与合金中细小Mg_2Cu颗粒的弥散析出有关;在450 ℃保温4 h后的热挤压Mg_(80)Cu_(10)Y_(10)合金中没有新相析出;随着热处理温度的升高或保温时间的延长,由于Mg_2Cu颗粒出现重溶及聚集长大现象,使得热挤压Mg_(80)Cu_(10)Y_(10)合金的显微硬度表现出逐渐下降的变化趋势.     

Employing magnesium-lead melt for synergetic and selective extraction of copper from copper-cobalt alloy

This research aims to extract Cu from Cu-Co alloy with high efficiency and selectivity by employing binary Mg-Pb melt. The optimal conditions for the extraction of Cu were determined. The results showed under optimal conditions, 96.5% of Cu in the Cu-Co alloy could be selectively extracted after treatment at 800 °C for 1 h, with the extraction rates of only 0.2% Fe, 0.6% Co, and 1.4% Si. The dissolution mechanism involved the counter diffusion of Mg/Pb and Cu across the diffusion zone of the Cu-Co alloy, and Mg in the binary Mg-Pb melt played a major role in the selective dissolution of Cu, especially at the dissolution forefront. The rate-controlling step of the extraction was dominated by the interfacial reaction.