ZnO纳米片状晶体的生长及其表征

采用高温碳热还原反应工艺．以氧化锌和碳粉为主要原料，在N2／H2O气氛中制备成功ZnO纳米片状晶体.所制薄片直径在100nm．厚度约50nm.采用场发射扫描电子显做镜（FESEM）、高分辨透射电子显做镜（HETEM）、X射线衍射分析仪（XRD）、拉曼（RAMAN）光谱等测试手段对产物进行表征。结果表明产物为ZnO，呈单一六角晶系纤锌矿结构，在相同的反应时间内，提高反应温度可使纳米片生长为六角塔状晶体，证填ZnO纳米片是六角平板状结构。     

L-半胱氨酸分子辅助溶剂热合成铜铟硫光伏材料

以CuCl2·2H2O为铜源,InCl3·4H2O为铟源,L-半胱氨酸为硫源,N,N二甲基甲酰胺(N,N-dimethylformamide,DMF)为溶剂,在180℃下反应16h合成了CuInS2微晶。用X射线粉末衍射仪、X射线光电子能谱、场发射扫描电子显微镜对产物的结构、形貌、相组分进行表征。结果表明产物是由厚度为10～50nm纳米片组成的球状CuInS2微晶。并对由纳米片组成的球状CuInS2微晶的形成机理进行了简单探讨。     

Bi4Ti3O12掺杂中温烧结(Ba,Sr)TiO3基电容器陶瓷

研究了Bi4Ti3O12掺杂量(≥8%,质量分数)对(Ba,Sr)TiO3(Barium Strontium Titanate,BST)铁电电容器陶瓷介电性能的影响,得到不同Bi4Ti3O12掺杂量与BST陶瓷性能的关系,得到中温烧结(≤1150℃)、高压(≥6.99MV/m)、低损耗(0.008)、符合X7R特性的多层陶瓷电容器瓷料.借助扫描电镜(SEM)研究了Bi4Ti3O12对BST陶瓷微观结构的影响,探讨了Bi4Ti3O12掺杂量对BST陶瓷性能和结构影响机理.结果表明:Bi4Ti3O12是通过与BST形成核-壳结构、形成玻璃相、偏析晶界及抑制晶粒生长、改善介温特性等来影响瓷料性能和结构的.这些结果为Bi4Ti3O12掺杂改性BST电容器陶瓷提供一定的依据.     

Bi3.25La0.75Ti3O12籽晶层对Ca0.4Sr0.6Bi4Ti4O15铁电薄膜的影响

用溶胶-凝胶法在Si(100)基片上沉积Ca0.4Sr0.6Bi4Ti4O15/Bi3.25La0.75Ti3O12双层膜,薄膜置于空气气氛在退火炉中700℃退火处理。用X射线衍射(XRD)和扫描电镜(SEM)分别对薄膜的相结构、取向度和微观形貌进行表征,并测试了样品的电滞回线。结果表明:与纯的Ca0.4Sr0.6Bi4Ti4O15铁电薄膜相比,双层膜具有更高的a轴取向度,表面均匀致密无孔隙,多为球形晶粒,且晶粒尺寸约为80nm,并且具有较高的剩余极化强度Pr=13.34μC/cm2,对应的矫顽场强为68.32kV/cm;Bi3.25La0.75Ti3O12的引入对Ca0.4Sr0.6Bi4Ti4O15铁电薄膜的形核生长和晶体学取向具有一定的促进作用,有利于样品的铁电性能。     

Bi4Ti3O12掺杂中温烧结(Ba,Sr)TiO3基电容器陶瓷

研究了Bi4Ti3O12掺杂量(≥8%,质量分数)对(Ba,Sr)TiO3(Barium Strontium Titanate,BST)铁电电容器陶瓷介电性能的影响,得到不同Bi4Ti3O12掺杂量与BST陶瓷性能的关系,得到中温烧结(≤1150℃)、高压(≥6.99MV/m)、低损耗(0.008)、符合X7R特性的多层陶瓷电容器瓷料.借助扫描电镜(SEM)研究了Bi4Ti3O12对BST陶瓷微观结构的影响,探讨了Bi4Ti3O12掺杂量对BST陶瓷性能和结构影响机理.结果表明Bi4Ti3O12是通过与BST形成核-壳结构、形成玻璃相、偏析晶界及抑制晶粒生长、改善介温特性等来影响瓷料性能和结构的.这些结果为Bi4Ti3O12掺杂改性BST电容器陶瓷提供一定的依据.     

SnO2-Li4Ti5O12复合材料的溶胶-凝胶法制备与表征

以SnCl4·5H2O、CH3COOLi·2H2O、(CH3(CH2)3O)4Ti和NH3·H2O为原料,采用溶胶-凝胶法制备SnO2-Li4Ti5O12复合材料粉末.采用热重和差热分析、X射线衍射、红外光谱、透射电镜和电化学测试等手段对复合材料的结构、表面形貌和电化学性能进行表征.结果表明:采用溶胶-凝胶法制备的复合材料是一种核-壳结构的纳米复合材料.在复合材料中,Li4Ti5O12以无定形态包覆在SnO2颗粒的表面,其包覆层的厚度为20~40 nm.电化学研究表明,0.1C放电时SnO2-Li4Ti5O12复合材料粉末的可逆容量达到688.7 mA·h/g,0.2C放电时经60次循环后复合材料的容量保持率达到93.4%.由于复合材料中Li4Ti5O12能够有效吸收SnO2电极的体积变化,有效阻止循环过程中Sn颗粒的聚集,大大改善了SnO2的循环稳定性.     

两步沉淀法合成Bi3.25La0.75Ti3O12(BLT)粉体及其表征

以五水硝酸铋(Bi(NO3)3·5H2O)、水合硝酸镧(La(NO3)3·nH2O)和钛酸四丁酯((C4H9O)4Ti)为原料,氨水为沉淀剂,分两步沉淀Ti离子和Bi、La离子,利用沉淀法合成了Bi3.25La0.75Ti3O12(BLT)粉体.利用差热分析(DTA)和热失重(TG)对两步沉淀法制备的前驱体粉体的热行为进行了分析,用X射线衍射(XRD)研究了其晶相演化过程,利用场发射扫描电子显微镜(FESEM)对BLT粉体粒度和形貌进行了观察.结果显示两步法制备的前驱体粉体经低温煅烧直接转化为单一的铋层状钙钛矿相BLT粉体,在700℃煅烧2 h合成的BLT粉体颗粒不大于100nm,颗粒间结合疏松,具有良好的分散性.     

水热法法合成Bi4Ti3O12纳米晶

以Bi(NO3)3·5H2O和Ti(OCrH9)4为原料,KOH作为矿化剂,在200℃温度下水热反应24 h获得了纯相Bi4Ti3O12粉体.利用XRD对合成粉体的物相进行了表征,利用TEM和SEM观察了合成粉体颗粒的微观形貌.结果显示,所合成的粉体为片状或带状的单晶Bi4Ti3O12颗粒,片状颗粒的平面与(001)面平行.分析了片状结构Bi4Ti3O12形成的机制.     

浸渍提拉法合成Bi4Ti3O12基复合薄膜及其光催化性能

以TiO2、Bi4Ti3O12为原材料,采用浸渍-提拉法制备复合薄膜,研究了材料合成工艺对复合薄膜微观形貌、相结构及光催化性能的影响。XRD研究结果表明,合成的复合薄膜材料中含有正交相Bi4Ti3O12和锐钛矿TiO2两种晶相,Bi4Ti3O12沿垂直于玻璃基片的<001>方向取向生长。TiO2溶胶的浓度,Bi4Ti3O12的用量,以及表面活性剂的用量,拉膜次数对复合薄膜的成型有明显的影响,当TiO2溶胶的浓度为3mol/L、TiO2溶胶和Bi4Ti3O12质量比为10:1、表面活性剂的质量分数为3%、拉膜次数为3次的时候,合成的Bi4Ti3O12/TiO2复合薄膜较均匀且具有较优异的光催化性能。     

L-胱氨酸辅助合成Bi_2S_3纳米片状球和花状结构(英文)

以硝酸铋[Bi(NO)3·5H2O]和L-胱氨酸为反应原料,采用溶剂热法制备出Bi2S3纳米片状球和花状结构。L-胱氨酸(一种非常普遍和实用的氨基酸)作为硫源,在实验过程中不释放出刺激性气味(H2S)。利用X-射线衍射(XRD)、扫描电子显微镜(SEM)对所合成的产物的晶型结构、组成和表面形貌等进行了表征。结果表明:所合成的产物为典型的Bi2S3正交结构;在170°C条件下反应12h,以DMF为溶剂能够得到Bi2S3纳米片状球和花状结构。根据实验结果,对所合成Bi2S3的可能形成机理进行了简单探讨。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

The Mirror with Patterns of Auspicious Animals and Grapes——Exquisite cast mirror and the technology of surface tin-enrichment by rubbing-in and infiltration of tin-rich powder

<正>Bronze mirrors were used by the Chinese people before the introduction of the glass mirror.Only after it was replaced by the glass mirror did the bronze mirror gradually retreat from people's lives.Different styles of bronze mirrors were made in different historical periods,particularly in the Warring States Period,the Han and Tang Dynasties,which were the three peaks of the development of bronze mirror arts in ancient China.The casting techniques were exquisite.The surface of the bronze mirror was smooth and bright enough to reflect one's image,and there were scarcely any casting defects on the mirror surface.On the back of the bronze mirror,there were rich depictions of Arts and Humanities,and the ornamentations were also     

The 9th China International Diecasting Congress & Exhibition

The 9th China International Diecasting Congress ＆ Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition.     

Introduction of the Fluid Control Engineering Institute of Kunming University of Science and Technology

正The Fluid Control Engineering Institute of Kunming University of Science and Technology was set up in 1996.The researches of institute concentrate on electro-hydraulic(pneumatic)servo/proportional control and hydromechatronics.The Institute is committed to research and development of electro-hydraulic control of high-end technical equipment in ferrous metallurgy refining produc-     

RARE METALS Volume Contents

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