钢板热镀锌、铝生产线中辊件涂层的研究现状及发展趋势

钢板热镀锌、铝生产线中辊件常受熔融锌、铝液的腐蚀.概述了钢板热镀锌、铝生产线辊件涂层的研究现状,包括涂层材料、涂层结构、涂层工艺及封孔技术,提出了未来辊件耐熔融锌、铝涂层的发展趋势.     

对辊快速凝固制备颗粒增强铝基复合材料的新途径

为了制备基体晶粒细小，增强颗粒分布均匀且与基体结合良好，界面上无明显反应产物的颗粒增强铝基复合材料，在铝及铝合金双辊快速凝固技术研究的基础上，提出了同步喷射增强颗粒和结合熔体接触反应法的两种双脱快速凝固制备方法，介绍这两种方法制备颗粒增强铝基复事材料的思路，阐述了制备了复合材料的潜在特点。     

锆铝吸气剂合金对氢的热脱附

利用“闪炼灯丝脱附技术”,我们研究了锆铝吸气剂对氢的热脱附。实验结果表明其脱附谱出现双峰,第一个峰呈现一阶脱附作用,第二个峰呈现二阶脱附作用,它们的脱附活化能分别是2.15千卡/克分子和4.24千卡/克分子。并对热脱附的实验数据进行了分析和讨论,从而进一步深化了锆铝吸气剂对氢的吸附和脱附机理的本质认识。     

强制润滑拉拔对铝包钢丝组织及性能的影响

采用强制润滑拉拔技术、金相观察和力学性能测试,研究了拉拔模角、道次变形程度等对铝包钢丝毛坯断面上各层间的变形分布和钢铝间结合性能的影响.在强制润滑拉拔的条件下,减小拉拔模角有利于降低不均匀变形程度;减小道次变形程度有利于改善润滑条件,但易使变形集中在线材表层;合理的拉拔变形提高了变形均匀性和钢铝间的结合性能.     

强制润滑拉拔对包钢丝组织及性能的影响

采用强制润滑拉拔技术、金相观察和力学性能测试,研究了拉拔模角、道次变形程度等对铝包钢丝毛坯断面上各层间的变形分布和钢铝间结合性能的影响。在强制润滑拉拔的条件下,减小拉拔模角有利于降低不均匀变形程度;减小道次变形程度秀利于改善润滑条件,但易使变形集中在线材表层;合理的拉拔变形提高了变形均匀性和钢铝间的结合性能。     

铝包钢丝拉拔工艺设计与试验

选用连续挤压包覆法生产的铝包钢丝毛坯,采用强制润滑拉拔技术进行拉拔试验研究.通过试验、比较筛选了适合铝包铜丝拉拔的耐温耐压润滑剂.在对铝包钢丝拉拔工艺进行合理设计的基础上,拉制出了产品.对产品的机械性能和电性能进行了测试,并对断口进行了扫描电镜的观察.结果表明,双金属的结合性能良好,各项性能指标均达到相关标准.这一试验研究对铝包钢丝的生产有指导意义.     

辊缝与轧制速度对粉末轧制钛铝多孔板性能的影响

采用粉末轧制技术制备了大尺寸(长560~1000mm×宽210mm×厚2.5mm)钛铝多孔板,讨论了辊缝与轧制速度对钛铝多孔生板坯密度和厚度的影响,研究了钛铝多孔生板坯在不同烧结工艺下的孔隙变化情况。结果表明:随着辊缝的增大,钛铝多孔生板坯密度减小,厚度增加。随着轧制速度的增加,生板坯的密度降低,厚度变薄。生板坯经1200℃高温烧结后,反应更完全,所获得的孔隙呈现开孔隙结构。轧制速度为2m/min、辊缝为3mm时可获得孔隙率为38.02%、孔径分布均匀的钛铝多孔板。     

蒙脱土填充补强丁苯橡胶及对橡胶硫化特性的影响

以十八烷基三甲基溴化铵为插层处理剂改性蒙脱土。分别采用有机蒙脱土(C₁₈-MMT) 和Na-蒙脱土(Na-MMT) 填充补强丁苯橡胶, 用XRD 和TEM 对复合材料的结构进行表征。结果表明: 蒙脱土在橡胶基体中的分散取决于蒙脱土的亲油性, 亲油性越强, 蒙脱土的片层在橡胶中的分散越均匀, 完全有机化处理的蒙脱土能够被剥离成厚度为20 nm 左右的片层并均匀分散在橡胶基体中。蒙脱土的存在对橡胶的硫化反应有一定的影响, 有机蒙脱土对橡胶硫化反应有催化作用, 但不改变硫化反应的活化能; Na-蒙脱土片层阻碍了橡胶的硫化交联, 使交联反应对温度的敏感性降低, 导致表观活化能减小。有机蒙脱土填充补强丁苯橡胶, 由于提高了橡胶的交联密度, 同时有机蒙脱土具有高比表面积和滑移性, 大大提高了橡胶的机械性能, 其拉伸强度和300 %定伸应力与炭黑N330 补强橡胶相当, 而断裂伸长率较炭黑补强橡胶有大幅度的提高, 在替代炭黑作为橡胶的补强剂方面具有广泛的应用前景。      

进口轧辊磨床液压润滑系统分析与改造

唐钢冷轧厂二期轧辊磨床为美国进口CAPCO公司生产的工作辊磨床，主要对轧制线工作辊进行表而磨削处理，该磨床液压系统主要由三大部分构成，包括砂轮主轴润滑、砂轮修磨装置、及床体液压与润滑部分。     

双辊快速凝固制备颗粒增强铝基复合材料的新途径

为了制备基体晶粒细小、增强颗粒分布均匀且与基体结合良好、界面上无明显反应产物的颗粒增强铝基复合材料，在铝及铝合金双辊快速凝固技术研究的基础上，提出了同步喷射增强颗粒和结合熔体接触反应法的两种双辊快速凝固制备方法，介绍了这两种方法制备颗粒增强铝基复合材料的思路，阐述了制备的复合材料的潜在特点。     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Synthesis of Alumina-Zirconia Nanocomposites by Solgel Process

Al₂O₃-ZrO₂ nanocomposites were developed starting with the solgel process. Composite alumina-zirconia nanopowders were synthesized from metallorganic precursors (Aluminium secondary butoxide and zirconium Iso propoxide) using the solgel process. The parameters affecting the synthesis—solvent, concentration of precursor, R/H ratio (i.e., dilution of water in solvent)—were varied as also the temperature and pH. BET and TEM were used to measure nanosize. Diffuse reflectance spectroscopy and also qualitative optical absorption led to identical particle size estimate. The variation of process parameters was used to study the effect and interdependence of process parameters. Artificial Neural Networks was used to rigorously analyze the process. Although this led to confirmation of interdependence of parameters, the presence of a single overwhelming solvent variable was also established. Then the optimal process was used to synthesize more nanopowder. To produce bulk nanocomposite the nanopowders were sintered by varying the temperature and time period. The sintered lithoids were probed with a vickers hardness tester to measure elastic modulus, hardness, and fracture toughness. The results showed high elastic modulus, modest hardness, and very high fracture toughness.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Friction Stir Processing Strategies for Uniform Distribution of Reinforcement in a Surface Composite

Friction stir processing (FSP) is an important technique for preparing surface composites. Fabricating defect-free surface composites with uniform particle distribution by FSP is a challenging task. In this study, silicon carbide particles reinforced AA5083 alloy surface composites was fabricated using different FSP strategies including variation in process parameters, dual-tool processing and tool offset overlapping. Material flow of the processed material with reinforcement particles demonstrated that the distribution of particles was influenced by the stirring action of the probe as well as the extrusion of the plasticized material due to the movement of the tool. Process parameters, particularly rotational speed, showed a dominant influence on the distribution of silicon carbide particles.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.