Ti6Al4V表面电弧离子镀TiAlN涂层的高温防护性能

采用独立的高纯钛靶和铝靶，在TC4钛合金基材表面以电弧离子镀工艺沉积制备了TiAIN涂层。利用扫描电镜（SEM）对比分析了钛合金基体和涂层氧化前后的表面形貌，利用能谱仪（EDS）分析了氧化前后的表面成分变化，利用X射线衍射（XRD）分析了氧化前后的相结构。结果表明，TiAlN涂层表现出很好的高温稳定性能，显著改善了钛合金的高温抗氧化性。     

钛合金表面电弧离子镀TiAlN涂层的耐高温性能

采用独立的高纯钛靶和铝靶,在TC4钛合金基材表面以电弧离子镀工艺沉积制备了TiAlN涂层。利用扫描电子显微镜(SEM)对比分析了钛合金基体和涂层热疲劳及氧化前后的表面形貌,利用能谱仪(EDS)分析了氧化前后的表面成分变化,利用X射线衍射(XRD)分析了氧化前后的相结构。结果表明,TiAlN涂层表现出很好的高温抗氧化性能和热疲劳抗力,显著改善了TC4钛合金在高温环境下的使用性能。     

两种TiAlN涂层的往复滑动摩擦学性能研究*

采用PLINT磨损试验机,对比考察了2种磁控溅射TiAlN涂层在往复滑动条件下的摩擦磨损性能.在摩擦动力学分析基础上,并利用扫描电子显微镜（SEM）、激光共焦显微镜（LCSM）、电子能谱（EDX）和X射线衍射XRD进行了微观分析,探讨了TiAlN涂层的摩擦磨损机理.结果表明：TiAlN涂层的摩擦学性能与涂层本身微结构密切相关;较低的摩擦因数对应着较好的耐磨性;涂层的往复滑动磨损表现为磨粒磨损、剥层和氧化磨损的共同作用的机制.     

金属陶瓷多弧离子镀TiN／TiAlN涂层的结构与性能

采用多弧离子镀技术在Ti（C，N）基金属陶瓷基体上沉积了TiN／TiAlN涂层，通过扫描电镜、能谱仪、X射线衍射仪、原子力显微镜等分析技术对其显微组织、成分、相结构、粗糙度及涂层与基体间的结合强度进行了分析。结果表明，多弧离子镀TiN／TiAlN涂层后试样的表面为金黄色，涂层光滑平整，其均方根粗糙度为20．6nm，显微硬度达到2808HK。TiN相和TiAlN相均存在强烈的（111）择优取向。Al的含量从涂层内部到表面逐渐增大，呈现梯度分布特征。TiN／TiAlN涂层与金属陶瓷之间的结合强度高达57．52N。     

TA19合金表面TiAlN硬质涂层的耐磨性能研究

为了提高TA19合金的摩擦学性能,采用磁控溅射技术在TA19合金表面制备了TiAlN硬质涂层。采用扫描电子显微镜、X射线衍射仪和能谱仪研究了TiAlN涂层的微观形貌、物相组成和成分含量及分布,利用球-盘摩擦磨损试验机研究了不同载荷条件下硬质涂层和基体的摩擦行为及其磨损机理。结果表明:TiAlN涂层厚度约为4μm,表面为细小颗粒状,颗粒间较为紧密,颗粒尺寸大小均匀。涂层表面主要由Ti、Al、N元素组成,其原子比大约为1∶1∶1,涂层和基体间结合力可达到53.3 N。磨损试验结果表明,在TA19合金表面制备TiAlN涂层后,其摩擦系数和磨损率较TA19合金基体的有了明显的降低。在低载荷下,TiAlN涂层的磨损形式主要是磨粒磨损,在高载荷时转化为磨粒磨损和氧化磨损。     

TC4钛合金表面TiAlN/Ti涂层的抗冲蚀性能研究

目的 通过明晰TC4钛合金表面不同结构的TiAlN/Ti涂层的冲蚀机制,为提高TC4钛合金的抗冲蚀性能、制备具有良好冲蚀性能的涂层奠定基础.方法 采用磁过滤真空阴极弧(FCVA)与金属蒸汽真空弧(MEVVA)技术,按照一定方式在TC4钛合金表面制备相同厚度不同层数的TiAlN/Ti涂层,采用扫描电镜(SEM)、光学显微镜、纳米压痕仪,对TiAlN/Ti涂层的微观结构和力学性能进行表征和分析.采用冲蚀试验平台,通过参数的调整来模拟沙尘环境,开展TC4钛合金和TiAlN/Ti涂层的冲蚀试验,计算获得冲蚀率.采用Proto-LXRD应力仪测试分析冲蚀前后TiAlN/Ti涂层的残余应力,利用SEM对涂层的冲蚀形貌进行表征和分析,并探讨涂层冲蚀损伤机理.结果 相比于TC4基体试样,层数为4、8、12层的TiAlN/Ti涂层试件冲蚀后的质量损失分别降低了86.9％、91.3％和94.0％,残余压应力分别增加了34、135、203 MPa.对比冲蚀区表面形貌,当涂层的层数为4层时,冲蚀区涂层脱落明显;当涂层层数为8层时,冲蚀区涂层局部有脱落;当涂层层数为12层时,冲蚀区涂层脱落不明显,对基体的防护较好.结论 MEVVA离子源注入技术显著提高了涂层的致密度和涂层与基体间的结合力.TiAlN/Ti涂层能显著改善试样的表面性能.相同涂层厚度下TiAlN/Ti涂层的层数越多,H3/E2值越大,抗冲蚀性能越优异.     

多弧离子镀制备TiAlCN和TiAlN涂层的结构和摩擦磨损性能

目的 对比研究TiAlCN和TiAlN涂层的结构、塑韧性、结合力和摩擦磨损性能。方法 采用多弧离子镀技术制备了TiAlCN和TiAlN涂层。利用扫描电镜（SEM）、X射线衍射仪（XRD）和X射线光电子能谱仪（XPS）研究了涂层的微观形貌、元素和物相组成。通过纳米压痕、纳米划痕、划痕测试仪和摩擦磨损实验研究了涂层的硬度、塑韧性、结合力和摩擦学性能。结果 TiAlCN和TiAlN涂层表面均匀致密,有明显的柱状晶结构特征。TiAlN涂层的硬度（29.4±2.2） GPa大于TiAlCN涂层的硬度（22.5±1.1） GPa。TiAlCN涂层的H/E、H3/E^*2、塑韧性和结合强度优于TiAlN涂层。大气环境摩擦时TiAlN和TiAlCN涂层的摩擦因数分别为0.80和0.38,TiAlCN涂层的摩擦因数远低于TiAlN。TiAlN和TiAlCN的磨损率分别为1.4×10^-5 mm³/（N·m）和9.1×10^-6 mm³/（N·m）,TiAlCN涂层具有更低的磨损率。结论 碳元素的掺入可...     

TC4钛合金沉积NiCrAlY涂层的氧化行为

采用电弧离子镀（AIP）技术在TC4（Ti-6Al-4V）钛合金基体表面沉积制备NiCrAIY涂层,测定TC4钛合金和NiCrAIY涂层在700-900℃的氧化动力学曲线。通过扫描电镜（SEM）、能谱（EDS）分析与X射线衍射分析（XRD）研究TC4钛合金和NiCrAIY涂层氧化前后物相组成和组织形貌,讨论氧化过程中元素的扩散行为。结果表明：在700-900℃静态空气中氧化100h,NiCrAIY涂层能明显提高TC4钛合金的抗氧化性能,TC4钛合金氧化后形成A12O3层和TiO2层交替出现的氧化膜层;经700和800℃氧化后,NiCrAIY涂层保持其原始的相组成,但在表面形成Al2O3和Cr2O3混合氧化膜;经900℃氧化后,氧化膜由Al2O3和TiO2组成;经700℃氧化时,主要发生Ti和Ni两种元素的扩散;经800和900℃氧化时,由于Ti及Ni元素的剧烈扩散,界面附近出现Kirkendall疏孔带和约100μm的β相稳定区;经900℃氧化时,Ti扩散到涂层表面形成氧化物导致氧化速率提高,Cr元素开始向基体扩散并在近界面处富集。     

LD钢TiAlN涂层的制备及性能

采用电弧离子镀工艺在7Cr7Mo2V2Si模具钢(LD钢)表面沉积TiAlN涂层。通过X射线衍射仪、扫描电镜、维氏硬度计、磨损试验机和电化学工作站等手段对TiAlN涂层的综合性能进行了分析。结果表明:涂层表面平整、致密,截面无针孔等缺陷存在,其择优取向为(200)晶面。涂层基体之间有1μm左右的互扩散层,使得膜基之间的结合力牢固。涂层的耐磨性能良好,其磨损率为0.122 mg/h,涂层试样与基体相比相对耐磨性提高了1.25倍。在2300×10~(-6)硼酸溶液中,LD钢TiAlN涂层自腐蚀电流密度比基体降低了一个数量级,阻抗较基体高了1.66倍,TiAlN涂层提高了LD钢的耐硼酸腐蚀性能。剪切考核试验表明TiAlN涂层刀具的寿命比原来提高了约2倍。     

X12CrMoWVNbN10-1-1耐热钢表面电弧离子镀TiAlN涂层及其热震性能

运用电弧离子镀技术,采用独立的纯Ti和纯Al靶材在超超临界汽轮机叶片用X12CrMoWVNbN10-1-1耐热钢表面沉积TiAlN涂层。利用扫描电子显微镜和能谱仪等对涂层微观组织结构和成分等进行分析,并在室温到650℃温度区间测试涂层的抗热震性能。结果表明:TiAlN涂层表面光滑平整、均匀致密且无明显的空洞,涂层表面的Ti/Al原子比约为0.94;涂层的表面硬度值为1802HV0.1。经X射线衍射法分析,涂层表面的相为TiAlN相,具有(200)晶面择优取向;涂层在室温到650℃之间经受100次热震循环实验后,没有发生明显开裂,说明涂层与基体结合良好,但涂层表面出现一定程度的氧化现象。     

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.     

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.     

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.     

Rheology Feature of Simple Metal Melt

The rheology feature of Sb, Bi melt and alloys was studied using coaxial cylinder high-temperature viscometer. The results showed that the curve of torsion-rotational speed for Sb melt presents a linear relation in all measured temperature ranges, whereas for the Bi melt, the curve presents obvious non-Newtonian feature within the low temperature range and at relative high shear stress. The rheology feature of Sb80Bi20 and Sb20Bi80 alloy melts was well correlated with that of Sb and Bi, respectively. It is considered that the rheology behavior of Sb melt plays a crucial role in Sb80Bi20 alloy and that of Bi melt plays a crucial role in Sb20Bi80 alloy.