Pt—Pd—Rh合金的高温氧化

用ＴＧ热重仪测定Ｐｔ－Ｐｄ－Ｒｈ合金的挥发失重曲线，用Ｘ光电子能谱（ＸＰＳ）和溅射剥离技术确定其氧化态表层及次表层组元化学状态和浓度。结果表明合金挥发失重曲线遵循：Δｍ＝Ｋ０ｔ＾ｎ－直线失重规律。     

硝酸生产用的Pt-Pd-Rh催化剂表面状态研究

借助于ＣＡ,ＩＣＰ－ＡＥＳ和ＸＰＳ测定了在常压综合法氨氧化装置中使用的Ｐｔ－Ｐｄ－Ｒｈ合金系催化网的组成与表面状态的变化。随着催化网使用时间延长,Ｐｔ的体积浓度降低,Ｆｅ和Ｃａ污染增大。催化网表层中主组元的化学状态为Ｐｔ°,Ｐｄ°,Ｒｈ°,ＲｈＯ２和Ｒｈ２Ｏ３。催化网表面Ｐｔ明显贫化,而Ｐｄ和Ｒｈ相对富集。在合金中增高Ｐｄ的浓度,可降低Ｐｔ的损耗,降低表面Ｒｈ２Ｏ３浓度,因而有利于提高氨转换率。     

催化合金Pt—Pd—Rh—M四元系的结构与性能

研究了Ｐｔ－Ｐｄ－Ｒｈ－Ｍ四元合金的结构、力学性能和氧化挥发特性。与Ｐｔ－１０Ｒｈ和Ｐｔ－４Ｐｄ－３．５Ｒｈ氨氧化催化合金比较，四元合金具有结构单一稳定、晶粒细化、再结晶温度高、室温与高温力学性能高以及氧化挥发失重小的特点，适合于作氨氧化催化合金，还讨论Ｐｔ－Ｐｄ－Ｒｈ系催化合金中Ｐｄ的作用及机制。     

工业Pd-Ni合金捕集网的表面状态研究

在制备硝酸的氨氧化装置中,Ｐｄ－Ｎｉ合金作为捕集网用来回收铂,化学分析、电子探针微区分析和Ｘ射线光电子能谱被用来测定使用不同时间的网试样的成份和表面状态变化与分布。Ｐｔ／Ｐｄ和Ｒｈ／Ｐｄ比值与试样所在位置与运行时间有关。在捕集网表面上主组元的化学状态是Ｐｄ°、ＰｄＯ;Ｐｔ°、ＰｔＯａｄｓ、ＰｔＯ２;Ｒｈ２Ｏ３;Ｎｉ°、ＮｉＯ。发现各层网表面上Ｐｔ／Ｐｄ比值与这些表面上ＰｄＯ浓度成反比,讨论了１种新的铂回收机制     

高钯合金捕集网中钯的状态

用ＸＰＳ研究了氨氧化装置中使用的高钯合金捕集网中钯的化学状态，新网中钯仅以Ｐｄ＾０一种形态存在（Ｐｄ３ｄ５／２，ＢＥ＝３３５．２ｅＶ）使用后，Ｐｄ３ｄ５／２ＢＥ值向高电子结合能力方向位移，钯的化学状态发生变化，以Ｐｄ和ＰｄＯ形态存在，定量测定了Ｐｄ＾０和ＰｄＯ浓度，发现Ｐｔ／Ｐｄ和ＰｄＯ浓度成反比，由此讨论了钯和高钯合金回收铂的机制。     

Pt—Pd—Rh合金的高温力学性能

在Ｐｔ－４Ｐｄ－３５Ｒｈ合金中将Ｐｄ含量增至１５ｗｔ％时,研究了Ｐｄ及少量Ｃｅ、Ｒｕ对合金在１０００℃以下高温力学性能的影响。实验结果表明在低温下Ｐｄ有一定的强化作用,但降低了合金的抗蠕变性能,而在合金中分别添加Ｃｅ（＜０１ｗｔ％）、Ｒｕ（＜０５ｗｔ％）后,合金的高温力学性能得以改善并优于Ｐｔ－４Ｐｄ－３５Ｒｈ合金,且Ｃｅ对合金的强化作用优于Ｒｕ。     

萃取剂DTPM萃取Rh（Ⅲ）的性能及其分离效果

用ＤＴＰＭ作萃取剂萃取Ｒｈ（Ⅲ），得到了定量萃取Ｒｈ（Ⅲ）的最佳条件。用斜率法测得有机相萃合物组成为Ｒｈ（ＤＴＰＭ）２（ＳＣＮ＾－）２（ＣＨ３ＣＯＯ＾－）。ＤＴＰＭ萃取Ｐｄ（Ⅱ）、Ｐｄ（Ⅳ）和萃取Ｒｈ（Ⅲ）的条件相差很大，借此可用于Ｐｄ（Ⅱ）／Ｒｈ（Ⅲ）和Ｐｔ（Ⅳ）／Ｒｈ（Ⅲ）的分离，实验证明，分离效果良好。     

钌合金的分离及钌的分析

研究Ｐｄ－Ｎｉ－Ｒｕ和Ｐｔ－Ｐｄ－Ｒｈ－Ｒｕ合金中Ｒｕ的测定方法，合金以锌碎化进行强化预处理，然后经碱熔．水浸和蒸馏，馏出液经浓缩富集后用硫脲显色，此法适用于合金中０．１－１．０％含量Ｒｕ的测定。     

钌合金的分解及钌的分析

研究Ｐｄ－Ｎｉ－Ｒｕ和Ｐｔ－ｐｄ－Ｒｈ－Ｒｕ合金中Ｒｕ的测定方法。合金以锌碎化进行强化预处理，然后经碱熔、水浸和蒸馏，馏出液经浓缩富集后用硫脲显色。此法适用于合金中０．１～１．０％含量Ｒｕ的测定。     

ICP-AES法分析Au-Sb合金

用乙醚萃取Ａｕ－Ｓｂ合金中的Ａｕ，加络合剂抑制Ｓｂ的水解，提高了测定杂质元素的准确度。查明Ｓｂ对杂质元素测定的干扰。杂质元素标准加入回收率８２～１０３％，相对标准偏差２．０～１４％。制定了Ａｕ－Ｓｂ合金中Ｐｔ、Ｐｄ、Ｒｈ、Ｉｒ、Ａｇ等２６个杂质元素及合金成份Ｓｂ的测定方法。取２．５ｇ样品时杂质元素的测定下限为１×１０－４～２×１０－４％。测定Ｓｂ时相对误差＜２％。     

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.