稀土气相扩渗法制备稀土钨青铜KxLnyWO3及电性能

采用稀土气相扩渗法通过固-气界面反应以Keggin结构的K6[SiCoW11O39(H2O)]·13H2O为前驱体进行稀土气相扩渗.经X射线衍射分析(XRD)、差热-热重分析(TG-DTA)、X射线光电子能谱分析(XPS)和X射线能谱(EDS)分析表明:前驱体扩渗前后XRD衍射峰明显不同,扩渗后产物已无Keggin结构的特征衍射峰,生成了新的四方结构化合物K0.57La0.0062WO3和K0.59Ce0.0014WO3.DTA-TG分析表明:在空气气氛中,K0.57La0.0062WO3于600℃开始分解.导电性测试结果表明,K0.57La0.0062WO3电导率最高为2.03S-cm-1,K0.59Ce0.0014WO3电导率最高为0.0834 S·cm-1.     

ZrW2O8粉体及ZrW2O8/PI杂化薄膜的制备研究

以分步固相法制备了ZrW2O8粉体,以旋涂法制备出ZrW2O8/聚酰亚胺(PI)杂化薄膜,采用X射线衍射(XRD)对所得粉体的结构及性能进行表征,以傅里叶红外光谱(FT-IR)、热重-差热分析(TG-DSC)和扫描电子显微镜(SEM)研究了所得薄膜的结构、热稳定性及表面形貌.结果表明:采用分步固相法在1220℃制得高纯度ZrW2O8粉体,其在室温～500℃温度区间内平均热膨胀系数为-6.31×10-6K-1,ZrW2OB颗粒不会影响PI薄膜的结构和热稳定性,同时偶联剂的使用有助于提高ZrW2O8粉体在PI基体中的分散性.     

射频磁控溅射ZrW2O8薄膜的高温退火研究

采用ZrW2O8陶瓷靶材,以射频磁控溅射法在不同基片上沉积制备ZrW2O8薄膜.利用X射线衍射(XRD)仪和扫描电子显微镜(SEM)研究靶材性能和退火温度、气氛以及基片对薄膜的相组成、表面形貌的影响.结果表明:ZrW2O8靶材具有较高的纯度和致密度,磁控溅射制备的薄膜为非晶态,在730℃左右通氧条件下退火后得到择优生长的ZrW2O8薄膜:在750℃左右退火得到三方相ZrW2O8薄膜;在1200℃密闭的条件下淬火得到立方相ZrW2O8薄膜;在15到700℃温度区间内,制备的立方相ZrW2O8薄膜负热膨胀系数为-14.47×10-6 K-1,随着退火温度的提高,薄膜出现一些孔洞和裂纹.     

锂蓄电池正极材料LiV3O8的合成和充放电性能

采用一种液相反应的方法合成LiV3O8化合物 ,首先由NH3·H2 O ,LiOH与V2 O5反应合成含有Li和V的反应前驱产物 ,然后在 180℃的真空环境中进行干燥处理 ,最后将此物质在 5 80℃温度下煅烧成最终产物。采用热重分析试验分析了反应的机理。X射线衍射结果显示得到的物质与用传统合成方法得到的LiV3O8化合物的结构相比 ,在 (10 0 )方向上的衍射峰强度降低很多。在室温、恒电流为 3A/m2 条件下进行充放电试验 ,在 1.8～4.0V范围内 ,首次放电容量达到 2 30Ah/kg ,15周后仍能达到 2 10Ah/kg。     

超声波化学法制备纳米尖晶石型铁酸锰

在超声波辐射下,用前驱体法合成了纳米铁酸锰(MnFe2O4)粉末.超声辐射MnCl2·4H2O、FeCl3·6H2O和脲得到前驱体,再在950℃烘15 h制得平均粒径约35 nm的纳米MnFe2O4粉末.得到的纳米MnFe2O4粉末用X射线衍射(XRD),透射电镜(TEM),傅里叶转换红外光谱(FT-IR)进行表征并得到确认;产品磁学参数用样品振动磁强计进行了测定.     

快速共沉淀过程pH值对Ni_(0.8)Co_(0.1)Mn_(0.1)(OH)_2及LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2性能的影响

采用快速共沉淀法制备Ni0.8Co0.1Mn0.1(OH)2前驱体,利用前驱体与LiOH.H2O的高温固相反应得到锂离子电池层状正极材料LiNi0.8Co0.1Mn0.1O2,探讨pH值对材料结构和电化学性能的影响。通过X射线衍射(XRD)、扫描电镜(SEM)和电化学测试对合成样品进行表征。结果表明,pH值为11.00~12.00时,合成的Ni0.8Co0.1Mn0.1(OH)2前驱体均无杂相;pH值为11.50时,合成的前驱体制备出的正极材料具有良好的电化学性能,0.1C倍率下首次放电比容量为192.4 mA.h/g;经过40次循环,容量保持率为91.56%。     

制备过程pH值对FePO4·xH2O及LiFePO4性能的影响

以FeSO4·7H2O,H3PO4,H2O2和NH3·H2O为原料合成FePO4·xH2O前驱体,考察制备过程溶液pH值对合成FePO4·xH2O前驱体性能的影响;将Li2CO3,FePO4·xH2O和乙炔黑球磨混合,通过低温固相反应合成LiFePO4.用X射线衍射和扫描电镜对FePO4·xH2O和LiFePO4进行结构和表面形貌表征,研究不同pH值条件下合成的FePO4·xH2O前驱体为原料对制备的LiFePO4电化学性能的影响.结果表明溶液pH值1.5时制备的FePO4·xH2O中含有少量Fe(PO4)2(OH)2杂质.当pH分别为2、3、4和5时,合成的FePO4·xH2O均为纯相.pH值为2左右合成的FePO4·xH2O前驱体制备出的LiFePO4具有良好的电化学性能;其振实密度达1.11 g/cm3.     

合成温度对六方Li-Ni-Co-Mn-O固溶体结构和性能的影响

采用溶胶-凝胶法制备Li-Ni-Co-Mn-O化合物的前驱体．借助于X射线衍射(XRD)、扫描电镜(SEM)及充、 放电测试等表征了不同温度下焙烧前驱体对高温合成的Li-Ni-Co-Mn-O固溶体晶体结构、形貌及电化学性能的影响．结果表 明:前驱体于600℃焙烧即可形成六方层状结构的Li-Ni-Co-Mn-O固溶体,920-980℃产物的衍射峰强度及颗粒尺寸随合 成温度的升高而增大,950℃合成产物的I003／I104及晶胞体积要比920和980℃合成产物的大,而且950℃合成产物的首次 充、放电容量最商,电极极化最小,在2．5-4．5 V以28 mA／g的电流密度进行恒流充、放电,其放电比容量达180 mA·h／g, 循环稳定性较好．     

水热合成法制备纳米级CuWO_4·2H_2O粉体及其合成机理(英文)

选用Cu(NO3)2·3H2O和Na2WO4·2H2O分析纯作为反应原材料,通过水热合成法制备了纳米级的Cu WO4·2H2O粉体。讨论了前驱体Cu2WO4(OH)2的生成过程,并且建立了在水热合成过程中前驱体Cu2WO4(OH)2向Cu WO4·2H2O转变的机理。利用HRTEM以及XRD分析了前驱体和水热反应产物的物相及微观结构和形貌。结果表明:水热反应产物Cu WO4·2H2O粉体呈球形,粒径分布范围为20~30 nm。Cu WO4·2H2O粉体的生成过程符合原位结晶机制。在长时间的高热高压的水热环境中,WO42-离子在前驱体Cu2WO4(OH)2表面吸附扩散,通过脱水和原子重排,Cu WO4·2H2O在Cu2WO4(OH)2表面异相形核。WO42-离子通过Cu WO4·2H2O层与Cu2WO4(OH)2发生反应,直到WO42-离子被耗尽。     

Hydrothermal Synthesis of Nano-sized Cupric Tungstate (Ⅵ) Dihydrate and Its Synthesis Mechanism

选用Cu(NO3)2·3H2O和Na2WO4·2H2O分析纯作为反应原材料,通过水热合成法制备了纳米级的Cu WO4·2H2O粉体。讨论了前驱体Cu2WO4(OH)2的生成过程,并且建立了在水热合成过程中前驱体Cu2WO4(OH)2向Cu WO4·2H2O转变的机理。利用HRTEM以及XRD分析了前驱体和水热反应产物的物相及微观结构和形貌。结果表明:水热反应产物Cu WO4·2H2O粉体呈球形,粒径分布范围为20~30 nm。Cu WO4·2H2O粉体的生成过程符合原位结晶机制。在长时间的高热高压的水热环境中,WO42-离子在前驱体Cu2WO4(OH)2表面吸附扩散,通过脱水和原子重排,Cu WO4·2H2O在Cu2WO4(OH)2表面异相形核。WO42-离子通过Cu WO4·2H2O层与Cu2WO4(OH)2发生反应,直到WO42-离子被耗尽。     

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。     

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.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Formulas of Tension of Continuous Rolling Process

The development of computer controlled continuous rolling process calls for a mathematical expression that can express the inequality condition of "constant flow". Tension is the link of the continuous rolling process. From the condition of dynamic equilibrium, a differential equation of tension is given out. On the basis of the physical rules established from the industrial practice and experimental studies, the law of volume constancy, the linear relation of forward slip and tension, the state equation of continuous rolling, the formula of dynamic tension, and the formula of static tension have been obtained. These formulae reflect the functional relations between tensions, thickness, roll velocity, and time in the continuous rolling process. It is implied that the continuous rolling process is a gradually steady, controllable, and measurable dynamic system. An assumption of predicting the thickness of a steel plate using these tension formulae is also put forward.