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燃烧合成法制备超细 TiC 粉体(英文)

尹传强、邹正光、李晓敏 等 6 位作者2011-01-01稀有金属材料与工程

利用镁热、碳热还原钛铁矿,原位燃烧合成制备了超细 TiC 粉体。通过理论分析、实验研究分析了燃烧合成的规律及镁含量对产物特性的影响。结果表明,钛铁矿-镁-碳是一个强放热体系,体系开始反应的温度为 577.7 ℃,当钛铁矿与镁的摩尔比为 1:4 时,燃烧合成酸洗出的 TiC 微粉纯度最高,并显示了较窄的粒度分布,其平均粒度为 229.6 nm。

Advanced materials and compositesMXene and MAX Phase MaterialsAdvanced ceramic materials synthesis

11-钨锌三元杂多阴离子层状化合物的合成、表征及催化活性

单秋杰2011-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni

用离子交换法将具有K egg in结构11-钨锌三元杂多化合物K8[M ZnW11（H2O）O39]（M=Co2＋、N i2＋、Cu2＋、Cd2＋）嵌入到Zn2A l类水滑石中,得到层状化合物：Zn2A l-[M ZnW11（H2O）O39]（M=Co2＋、N i2＋、Cu2＋、Cd2＋）,并用XRD、IR、UV对其进行了表征。结果表明,杂多阴离子进入水滑石层间后,仍保留了其K egg in结构。利用层状化合物催化合成乙酸正丁酯考察其催化活性,结果表明,层状化合物在酯化反应中显示优良的催化性能。

Thermal Expansion and Ionic ConductivityPolyoxometalates: Synthesis and ApplicationsX-ray Diffraction in Crystallography

Si对Ti-Al-Si-N涂层微观结构及性能的影响

胡明媚、朱丽慧、王川 等 6 位作者2011-01-01硬质合金

Ti-Al-Si-N涂层是在Ti-Al-N涂层基础上发展而来的一种四元复合涂层。本文综述了Si对Ti-Al-Si-N涂层微观结构、硬度、残余应力、抗氧化性能、热稳定性能、摩擦磨损性能及切削性能的影响。分析表明：Si元素能有效细化晶粒,减少柱状晶,形成新型纳米结构,从而显著提高涂层硬度,可达39 GPa;Si的原子分数超过5%后,涂层残余应力逐渐降低;Ti-Al-Si-N涂层在1 100℃下仍具有良好的抗氧化性能;Si元素使涂层的热稳定性能有很大提高,Ti-Al-Si-N涂层1 100℃氧化后硬度无显著变化;与Ti-Al-N涂层相比,添加Si元素后涂层的摩擦系数由0.7下降至0.5;Ti-Al-Si-N涂层刀具的使用寿命与Si原子分…

Metal and Thin Film MechanicsAdvanced Surface Polishing TechniquesAdvanced ceramic materials synthesis

Energy Transfer Effect of Sm3+/Eu3+Co-doped in LaOF Nanocrystals System with Hexagonal Phase

伏振兴 FU Zhen-xing、刘碧蕊 LIU Bi-rui2011-01-01ACTA PHOTONICA SINICA

为了探讨Sm3+/Eu3+共掺体系的荧光光谱特性和能量转移机理,采用水热-烧结法制备了Sm3+/Eu3+共掺LaOF纳米晶体颗粒,并用X射线衍射和透射电子显微镜对纳米晶体颗粒进行了表征.结果显示,所制备的纳米晶体颗粒呈六方相,均匀性和分散性良好,平均粒径为70 nm左右.通过442 nm连续光激发,在六方相LaOF:Sm3+/Eu3+纳米体系中实现了Sm3+离子向Eu3+离子的能量转移,观测到了因能量转移效应而产生的Eu3+离子5D0能级的荧光发射谱线.光谱学研究发现,能量转移源于Sm3+离子4G5/2能级向Eu3+离子5D0能级的弛豫过程,并且随着受主离子Eu3+浓度的增加,能量转移效率也随之提高.

Luminescence Properties of Advanced Materials

Применение адаптационных механизмов для повышения качества продукции с глубокой степенью переработки

Э. М. Голубчик、А. Г. Корчунов、К. Г. Пивоварова 等 4 位作者2011-01-01Вестник Воронежского государственного технического университета

Technological aspects of high tensile reinforcement production for new generation reinforced concrete ties manufacture were analyzed. The article gives the results of studies carried out to find out the influence of chemical composition of steel grades 80ХФЮ, 85ХФЮ, 85ФЮ on variability of mechanical properties of hot…

Industrial Engineering and TechnologiesAdvanced Energy Technologies and Civil Engineering InnovationsStructural mechanics and materials

Morphology Control of Si Nanostructures by SEMD Method and Their Application on Solar Cells

黃泰淵2011-01-01清華大學材料科學工程學系學位論文

Recently there have been worldwide interests in the research of next generation solar cells by novel nanostructures and nanomaterials. Because of their near-wavelength-scale geometry, the Si nanostructure arrays have broadband low reflection and therefore strong absorption from near IR to visible region, which can be…

Nanowire Synthesis and ApplicationsSilicon Nanostructures and PhotoluminescenceSilicon and Solar Cell Technologies

Irreversible transformation of the porphyrin supramolecular structures under a water vapor environment

Ming Ye、Yi Zhang2011-01-01OpenAlex

Supramolecular structures formed by H(4)TPPS(4)(2-) have been widely used for different applications. In this paper, the stability of H(4)TPPS(4)(2-) nanorods on mica substrate is investigated by atom force microscopy (AFM) observation. An irreversible transformation of H(4)TPPS(4)(2-) from nanorods (3.8 +/- 0.4 nm in…

Surface Chemistry and CatalysisPorphyrin and Phthalocyanine ChemistryMolecular Junctions and Nanostructures

이온 결합 물질에 대한 원자간 포텐셜 모델

이병주、이광렬2011-01-01대한금속재료학회지

A review of the development history of interatomic potential models for ionic materials was carried out paying attention to the way of future development of an interatomic potential model that can cover ionic, covalent and metallic bonding materials simultaneously. Earlier pair potential models based on fixed point ch…

Inorganic Chemistry and MaterialsMachine Learning in Materials ScienceFerroelectric and Piezoelectric Materials

CaCu_3Ti_4O_（12）-xMg_2TiO_4陶瓷的介电性能

杨锋莉、吴俊林、Yan Yan 等 4 位作者2011-01-01陕西师范大学学报：自然科学版

采用传统陶瓷烧结方法,制备了CaCu3Ti4O12（CCTO）-xMg2TiO4（x=0,0.2,0.4,0.6）陶瓷样品.利用X射线衍射仪和扫描电镜,分别确定了样品的物性和形貌,并用阻抗分析仪测定了不同频率和温度下材料的介电常数和介电损耗,进而研究Mg2TiO4对CCTO材料微观结构和介电性能的影响.结果表明：添加Mg2TiO4可促进CCTO晶界处小晶粒生长,抑制大晶粒生长,增强晶界的绝缘性,使低频介电弛豫行为明显减弱,降低CCTO陶瓷样品低频范围的介电损耗.当x=0.2时,在50~150 Hz频率范围内,tanδ均在0.05附近.该实验结果为优化CCTO材料性能、推进其在电容器方面的应用提供了实验依据.

Dielectric properties of ceramicsDielectric materials and actuatorsMicrowave Dielectric Ceramics Synthesis

Analysis of Formation Mechanism of Quench Stain on Tinplate Surface

Changfu Liu、Bai Huiping2011-01-01Journal of Wuhan Engineering Institute

通过对镀锡板淬水斑的宏观形貌观察,并对有淬水斑的镀锡板和正常镀锡板表面成分进行电子探针能谱对比分析,发现产生淬水斑的原因是因为镀锡板在淬水过程中表面粘附了含有杂质的污染水所致.因此,为了防止镀锡板产生淬水斑,镀锡板淬水过程中表面一定不能粘附被污染的水滴,同时镀锡板淬冷水一定要使用洁净的脱盐水.

Anodic Oxide Films and NanostructuresAdvanced Machining and Optimization TechniquesIndustrial Vision Systems and Defect Detection

Анализ изгибно-крутильных колебаний комбинированных систем шпренгельного типа

V Egorov、П. Н. Григорьев、Alexander N. Sudakov 等 4 位作者2011-01-01Известия Петербургского университета путей сообщения

One of the upcoming and promising directions of building structures development is application of combined strut-framed systems as flat and spatial bearing structures. This article presents the analysis of some aspects of flexural and flexural-and-torsional bendings of spatial strut-framed systems. The investigation r…

Structural mechanics and materials

Evaluation of the interactions between human cells and silicone rubber surfaces modified by Atom Transfer Radical Polymerization

Ana Catarina Correia Leirós2011-01-01Portuguese National Funding Agency for Science, Research and Technology (RCAAP Project by FCT)

Dissertação de mestrado integrado em Engenharia Biomédica (área de especialização em Engenharia Clínica)

Polymer Nanocomposite Synthesis and IrradiationAdvanced Polymer Synthesis and CharacterizationSurface Modification and Superhydrophobicity

钙钛矿型复合材料La_(0.7)Sr_(0.3-x)M_xFeO_3(M=K,Ca)的制备及性能

韩尚宁、张丽敏2011-01-01河南师范大学学报：自然科学版

采用EDTA-柠檬酸联合络合法合成了La0.7Sr0.3-xCaxFeO3(LSCaF;x=0,0.1,0.15)和La0.7Sr0.3-xKxFeO3(LSKF;x=0,0.01,0.05)系列阳极材料,并采用XRD,SEM技术及直流四探针法等实验手段分别对其结构,形貌及电导率进行了测试,分别讨论了A位掺入Ca,K对LSF材料的结构及电化学性能的影响.结果显示:K,Ca的掺入提高了LSF样品的烧结性能,且所有组分的电导率在低温时随温度的升高而增大,高温时又随之降低.其中,K的掺入大大提高了材料的电导率,K含量为1%时,其电导率在650℃时达到最高值148.45 S.cm-1.

Ferroelectric and Piezoelectric MaterialsMagnetic and transport properties of perovskites and related materialsMultiferroics and related materials

嗜熱菌 Geobacillus thermocatenulatus NTU 03 高溫下逆境反應及其熱穩定脂肪酶性質研究與應用

施宗偉2011-01-01OpenAlex

Thermophiles have been reported to be a good thermostable enzyme source due to their living environment. Thermostable enzymes not only exhibit potential for industrial applications but are also used as protein structure models in studies on protein thermostability. In addition, because of the high temperature of these…

Endoplasmic Reticulum Stress and DiseaseEnzyme Structure and FunctionEnzyme Catalysis and Immobilization

논문 : 온도변화에 따른 ETFE 막재의 재료특성 연구

김영호、김재열2011-01-01OpenAlex

ETFE막재는 PTFE막재에 비해 상대적으로 두께가 매우 얇고 유연하기 때문에 다양한 온도환경에 따른 막재의 재료특성을 알아볼 필요가 있다. 본 논문에서는 ETFE 막재에 대해 다양한 온도하에서의 재료특성 실험을 수행하였다. 첫째로, -20℃, 0℃, +20 ℃, +40℃ 하에서 각각 5 시험편을 이용하여 인장실험을 수행하였으며, 각 온도하에서의 항복응력, 인장강도, 영계수를 도출하였다. 두 번째는, 25℃, 40℃, 60℃하에서 각각 3MP, 6MP, 9MP의 하중을 가하여 각 온도에 따른 크리프 변형도를 알아보았다. 마지막으로, -15℃, 0℃, 20℃하에서의…

Engineering Applied ResearchFiber-reinforced polymer compositesMaterial Selection and Properties

NANOMETRIC FINISHING OF FLAT SURFACES USING MAGNETIC FIELD

Mehrdad Vahdati2011-01-01OpenAlex

The need for mirror-finished surfaces has grown rapidly in recent years. This is due to improvements of new products application in high technology industries. New requirements urge new production methods. One of which, in the field of machining technology, is Magnetic Abrasive Finishing. This results in surface rough…

Advanced machining processes and optimizationDiamond and Carbon-based Materials ResearchAdvanced Surface Polishing Techniques

“绿色制造·共塑未来”2011国际橡塑展重临广州

邹文昭、陈维2011-01-01玩具世界

＂CHINAPLAS 2011国际橡塑展＂（第二十五届中国国际塑料橡胶工业展览会）将于2011年5月17日至20日重临广州,在亚洲最大的展览馆——广州琶洲展馆隆重举行,为全球业界展示＂亚洲第一大展＂的飒爽风姿!届时玩具制造业者可以前往现场观展,分享最新玩具制造原材料及设备资讯,把脉未来原材料市场趋势。

Polymer Science and PVCPolymer Foaming and CompositesPolymer Science and Applications

Десульфурация стали в условиях ГУП «ЛПЗ». Разработка рекомендаций по повышению ее эффективности

В. А. Чайкин、А. В. Чайкин、К. А. Мягков 等 4 位作者2011-01-01Electronic scientific archive of UrFU (Ural Federal University)

Проведена работа по повышению эффективности реакции десульфурации стали и улучшению ее качества.

Engineering Diagnostics and ReliabilityMaterial Properties and Failure MechanismsMetallurgical Processes and Thermodynamics

Wear Analysis of a Bilateral Facet Augmentation System Subject to Cyclic Compressive Impact Loading

Aniruddh N. Nayak2011-01-01OhioLink ETD Center (Ohio Library and Information Network)

Dynamic stabilization systems are emerging as an alternative to fusion instrumentation.However cyclic loading and micro motion at various interfaces may produce wear debris leading to adverse tissue reactions such as osteolysis.Ten million cycles of wear test was performed for PercuDyn™ in axial rotation and the wear…

Orthopaedic implants and arthroplastyHigh-Velocity Impact and Material BehaviorTribology and Wear Analysis