铝表面改性SiOx薄膜力学性能研究

采用常压化学气相沉积(APCVD)技术在铝基底上成功制备了改性SiOx陶瓷薄膜.通过显微硬度测试与涂层附着力自动划痕测试定量研究了薄膜显微硬度和膜基结合强度,利用光学显微镜(OM)和扫描电子显微镜(SEM)观察了薄膜的原始表面以及压痕、划痕形貌.结果表明,SiOx膜层由大小不均匀的等轴状颗粒团聚堆垛而成,退火处理时长大或融合成片状;SiOx薄膜有效提高纯铝表面的硬度,并能通过SiOx薄膜变形以松弛表层应力,抑制脆性裂纹产生;划痕测试证明基底和薄膜具有很高的结合强度,薄膜与基底发生塑性变形而不剥离.     

铝表面改性SiOx薄膜力学性能研究

采用常压化学气相沉积（APCVD）技术在铝基底上成功制备了改性SiOx陶瓷薄膜。通过显微硬度测试与涂层附着力自动划痕测试定量研究了薄膜显微硬度和膜基结合强度，利用光学显微镜（0M）和扫描电子显微镜（SEM）观察了薄膜的原始表面以及压痕、划痕形貌。结果表明，SiOx膜层由大小不均匀的等轴状颗粒团聚堆垛而成，退火处理时长大或融合成片状；SiOx薄膜有效提高纯铝表面的硬度，并能通过SiOx薄膜变形以松弛表层应力，抑制脆性裂纹产生；划痕测试证明基底和薄膜具有很高的结合强度，薄膜与基底发生塑性变形而不剥离。     

氧气流量对电弧离子镀制备氧化铬薄膜结构及摩擦学性能的影响

目的 研究氧气流量对多弧离子镀制备的氧化铬薄膜结构、力学性能以及摩擦学性能的影响.方法 采用多弧离子镀技术在不同氧气流量下(70、90、110、130、150 mL/min)在Inconel718高温合金表面制备了氧化铬薄膜.利用扫描电子显微镜、冷场发射扫描电镜分别分析薄膜的表面形貌与断面形貌.利用X射线衍射仪和Raman光谱仪对薄膜的物相组成及晶体结构进行分析;利用划痕仪、纳米压痕仪评价薄膜的力学性能.利用高温球盘摩擦磨损试验机测试薄膜的摩擦学性能,并利用光学显微镜及三维表面轮廓仪观察磨痕的形貌并测量摩擦后的磨损体积.结果 随着氧气流量的增加,薄膜的沉积速率先增大后减小,表面逐渐变得致密光滑,除110 mL/min氧气流量下的截面形貌是无序紧密堆积的纳米级晶体颗粒外,其他流量下制备的薄膜截面形貌均为柱状晶.薄膜的主要物相组成由Cr2O2.4逐渐转变为Cr2O3,且薄膜的晶化程度增加.薄膜与基底的粘结强度逐渐降低,薄膜的硬度和弹性模量先升高后降低.在110 mL/min氧气流量下沉积的氧化铬薄膜表现出较好的宽温域摩擦学性能,在室温下(25℃)的摩擦因数较高,约为0.49,高温下(400、600、800℃)的摩擦因数为0.27～0.30.其他氧气流量下制备的氧化铬薄膜的常温摩擦学性能均较差.结论 氧气流量对沉积的薄膜的表面形貌、断面形貌、物相组成以及力学性能有很大的影响.110 mL/min氧气流量下制备的氧化铬薄膜不仅具有较好的力学性能,而且表现出了较为优异的宽温域摩擦学性能.     

气体流量对LPCVD ZrC涂层结构和沉积机理的影响

利用低压化学气相沉积(LPCVD)工艺,采用Zr-Br2-C3H6-H2-Ar反应体系,在1200℃下,于石墨基底表面制备了ZrC涂层。研究了气体流量对ZrC涂层微观形貌和沉积机理的影响。结果表明,随着气体流量由200 mL/min向1000 mL/min增大,涂层的沉积速率先增大后减小,在800 mL/min时达到极值,极大值为3.37×10-3g·cm-2·h-1。同时,涂层的择优取向发生了明显的变化,在600~800 mL/min范围内,涂层具有稳定且强烈的(200)晶面择优取向。XPS分析结果表明,沉积产物中的C/Zr比也随气体流量的增大,相应的由0.85快速地升高到1.49。当气体流量为200 mL/min时,涂层致密光滑,ZrC晶粒具有典型的等轴晶结构特征;当气体流量为400~800 mL/min时,涂层光滑平坦,ZrC晶粒具有规则的四面体结构;当气体流量为1000 mL/min时,涂层表面存在着大量不规则的岛状、弓状颗粒。基底表面边界层厚度的变化是影响涂层沉积过程的主要因素。     

AZ31表面混合碳源制备DLC薄膜的结构和性能

为了提高镁合金的耐蚀性和耐磨性,扩大镁合金的应用,节能减排,保护环境,采用绿色环保的磁控溅射技术在AZ31表面制备了强保护性的DLC薄膜。采用X射线小角掠入射研究薄膜的物相结构,借助扫描电镜观察薄膜表面形貌、横截面形貌和腐蚀形貌,采用纳米压痕仪测试薄膜的力学性能,分别采用电化学工作站和摩擦磨损试验机研究薄膜的耐蚀性和耐磨性,膜基的结合性能采用划痕试验评估。结果表明,薄膜为无定形碳结构,随着活性气体流量的增加,薄膜结构由非晶向纳米晶转变。薄膜与基体结合良好,结合力19~25 N。薄膜表面具有弥散分布的不规则颗粒,且表面粗糙度受活性气体流量影响明显。薄膜厚度1.15~1.18μm,活性气体流量对薄膜厚度影响很小。随着活性气体流量的增加,DLC薄膜的硬度和杨氏模量增大,其最大值分别为17.35 GPa和94 GPa;摩擦系数和磨损率降低,其最小值分别为0.103和6.45×10^-10mm³/(N·m)。活性乙炔流量5 mL/min时,薄膜的耐蚀性能最好,活性乙炔流量10 mL/min时,薄膜的耐磨性能最好。     

以HMDS为前驱体沉积SiC涂层的研究

以六甲基二硅胺烷(HMDS)作为硅源和碳源,H2为载气,Ar为稀释气体,前驱体由载气通过鼓泡法带入反应室,通过等温化学气相渗透法(Isothermal Chemical vapor Infiltration,ICVI)在SiC纤维表面沉积SiC涂层.通过控制沉积温度来控制涂层的表面形貌、厚度.研究表明,在1100℃沉积的涂层中开始有β-SiC晶相析出,适当降低沉积温度至950℃可以防止残余碳在反应室的富集,在950℃时SiC的沉积厚度与沉积时间呈近线性关系.     

衬底温度对FeCrCoNiMn高熵合金氮化物薄膜组织结构和电性能的影响

采用射频反应磁控溅射法在Si(100)衬底上制备出纳米晶高熵合金FeCrCoNiMn氮化物薄膜,结合场发射扫描电子显微镜(FESEM)、电子显微探针(EPMA)、X射线光电子能谱分析仪(XPS)、原子力显微镜(AFM)及四点探针(FPP)研究了衬底温度(40、300、500℃)对沉积薄膜的表面形貌、化学组成、微观结构和导电性能的影响。结果表明,衬底温度对高熵合金FeCrCoNiMn-N薄膜的形貌、组织结构和导电性能有显著影响。随衬底温度的升高,薄膜的表面粗糙度和颗粒/晶粒尺寸增大;与氮反应沉积后,含氮高熵合金薄膜中形成了Mn3N2、MnN、Cr2N和CrN金属氮化物,而Fe、Ni和Co元素则以Fe-Ni-Co合金相形式存在。不含氮合金薄膜其电阻率高达131.78mΩ·cm,加入氮沉积后,随衬底温度的增加,含氮薄膜的电阻率逐渐减小(6.14~0.43mΩ·cm),含氮合金薄膜的电阻率明显小于合金靶材的沉积膜,衬底温度500℃时薄膜的电阻率达到最小值0.43mΩ·cm。     

沉积压力对磁控溅射WS2薄膜摩擦学性能的影响

目的研究不同沉积压力对磁控溅射WS2薄膜微观结构、力学性能和摩擦学性能的影响。方法采用射频磁控溅射法制备WS2薄膜。利用扫描电镜(SEM)和X射线衍射仪(XRD)对薄膜微观形貌、成分和晶相结构进行表征。用纳米压痕仪、摩擦磨损试验机和白光干涉三维形貌仪测试薄膜的力学性能和摩擦磨损性能。结果随着沉积压力增大,WS2薄膜疏松多孔结构明显降低,粗大柱状晶显著细化,薄膜致密度得到有效改善。沉积压力大于0.8Pa时,WS2薄膜表现出明显的(101)晶面择优取向。WS2薄膜硬度变化与薄膜中S/W原子比变化趋势相反,弹性模量逐渐减小。沉积压力0.4 Pa时,由于WS2薄膜大部分易滑移(002)晶面平行于基体表面,摩擦系数最低,为0.092,但其耐磨性能最差。沉积压为1.6 Pa时,WS2薄膜的磨损率最低,为2.34×10^-7 mm^3/(N·m),表现出良好的耐磨性能。结论改变沉积压力可以显著提高WS2薄膜致密度,改善薄膜的力学性能,提升WS2薄膜的摩擦磨损性能。     

AZ31表面混合碳源制备DLC薄膜的结构和性能

为了提高镁合金的耐蚀性和耐磨性,扩大镁合金的应用,节能减排,保护环境,采用绿色环保的磁控溅射技术在AZ31表面制备了强保护性的DLC薄膜。采用X射线小角掠入射研究薄膜的物相结构,借助扫描电镜观察薄膜表面形貌、横截面形貌和腐蚀形貌,采用纳米压痕仪测试薄膜的力学性能,分别采用电化学工作站和摩擦磨损试验机研究薄膜的耐蚀性和耐磨性,膜基的结合性能采用划痕试验评估。结果表明,薄膜为无定形碳结构,随着活性气体流量的增加,薄膜结构由非晶向纳米晶转变。薄膜与基体结合良好,结合力19~25 N。薄膜表面具有弥散分布的不规则颗粒,且表面粗糙度受活性气体流量影响明显。薄膜厚度1.15~1.18μm,活性气体流量对薄膜厚度影响很小。随着活性气体流量的增加,DLC薄膜的硬度和杨氏模量增大,其最大值分别为17.35 GPa和94 GPa;摩擦系数和磨损率降低,其最小值分别为0.103和6.45×10^(-10)mm^(3)/(N·m)。活性乙炔流量5 mL/min时,薄膜的耐蚀性能最好,活性乙炔流量10 mL/min时,薄膜的耐磨性能最好。     

氧氩流量比对溅射氧化钒薄膜结构和光学性能的影响

采用射频反应磁控溅射方法制备氧化钒(VOx)薄膜,对样品的沉积速率、物相结构、表面形貌和可见光波段的透过率进行表征,研究了在沉积气压一定的情况下,氧氩流量比对氧化钒薄膜结构和光学性能的影响。结果表明,改变氧氩流量比可明显改变薄膜结构,随着氧气比例的增加,沉积速率下降,薄膜表面出现了颗粒结构,颗粒尺寸具有增大的趋势,光透过率增大。     

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.     

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.