Preparation of Ti5Si3 by silicothermic reduction of titanium-bearing blast furnace slag

In the present study, the silicothermic reduction experiments of titanium-bearing blast furnace slag were carried out in argon atmosphere at different temperatures in order to prepare titanium silicide (Ti₅Si₃). The influences of temperature and reaction time on the reaction process were studied by X-ray diffraction and scanning electron microscope equipped with energy-dispersive spectroscopy. It was found that most of the titanium can be transformed to Ti₅Si₃ within a short time when the reduction temperature was higher than 1773?K. The produced Ti₅Si₃ particles were sintered and formed a porous skeleton structure due to its high melting point, with liquid slags filled in it. Meanwhile, it was found that high temperatures and long reaction time were beneficial for the separation of slag from Ti₅Si₃. This novel method of preparing Ti₅Si₃ may provide a route to recycle titanium-bearing blast furnace slag.     

40t转炉炉体裙板的改型

本文针对宝钢集团新疆八一钢铁股份炼钢厂40 t转炉炉体裙板易变形、极易缺失,最终导致炉帽段高温氧化锈蚀严重,炉体整体寿命较低的问题。进行分析并对炉体裙板进行了改型,解决了制约生产的瓶颈问题。     

台湾温泉景观设计新趋势对福建温泉的启示

福建和台湾具有相似的温泉资源禀赋,本文通过分析台湾温泉旅游度假项目中景观设计方法的新趋势,结合福建省的地域特色和温泉旅游发展状况,提出了对福建省温泉旅游项目发展的启示。     

Numerical simulations of phenomena observed at hot microelectrodes: Inlaid microdisk

In this paper we describe numerical simulations of a number of physico-chemical phenomena observed at disk microelectrodes polarized with a high frequency ac waveform. These phenomena include resistive heating of an electrolyte solution surrounding a microelectrode, electrothermal flow of the solution and electrochemical mass transport of dissolved redox species. The main purpose of doing these simulations was to provide the required theoretical background to the previously obtained experimental data. It is shown that the simulated linear flow rate of the solution is proportional to the voltage across the solution resistance in the power four and inversely proportional to the radius of the microelectrode. Thus this supports the idea that the convection at hot microelectrodes is driven primarily by the electrothermal flow. Simulations of the Faradaic current agree semi-quantitatively with the experimental observations. We have identified possible reasons for the observed discrepancy between the two sets of data.     

Quality assessment of polymer replication by hot embossing and micro-injection moulding processes using scanning mechanical microscopy

This paper describes observations and metrological analyses made to compare the replication quality of polymeric replicas obtained by filling micro-cavities using both hot embossing and micro-injection moulding processes. The experiments are performed with polypropylene (PP) at a constant melt temperature and a constant mould temperature, whereas hot embossing tests are carried out with the same polymer at temperatures close to the softening one.The results concerning the micro-cavities filling provide information on the reliability about the possibilities of replication topographical surface geometries. The data obtained by scanning mechanical microscopy (SMM) are used to determine the comparative filling ratio values.     

High strength,high elongation steels obtained by hot deformation and quenching and partitioning

Abstract

An effective means to achieve energy savings, environmental protection and improved safety in automobiles is to explore higher strength steels having low cost and better processability and service performance. Two routes to develop advanced high strength steels combining ultrahigh strength with appropriate plasticity and characterised by low cost and good quality are proposed: hot stamping followed by quenching and partitioning (HS-Q&P) and deformation induced ferrite transformation followed by Q&P (DIFT-Q&P).     

苯胺生产技术的改进

庆阳化学工业公司2万t／a苯胺装置系采用吉化苯胺生产技术建成的。在项目建设中，对原技术进行了改进，包括流化床反应器在内的整个生产系统已经从2万t／a放大到2．5万t/a。由我们独立开发的先进工艺技术─—《苯胺工艺软件包》被首次应用到该工程的设计中，装置的原材料、动力及公用工程消耗量明显降低，经济效益显著。本文论述了节能方法、计算机流程模拟和优化技术在该工程项目中的应用。     

关于金刚石合成棒中白色物质形成机理的研究

对金刚石合成棒中白色物质的研究表明，它是在高温高压条件下搞入合成棒的叶腊石与触煤合金发生一系列复杂反应而使触媒渣化的产物。文中对触媒渣化的热力学、动力学亦作了分析。     

An optical strain measurement system for asphalt mixtures

Knowledge of the conditions governing the initiation and propagation of cracks in hot mix asphalt (HMA) mixtures is a prerequisite for a comprehensive understanding of HMA cracking mechanisms. Traditional strain measurement sensors have proved to be not completely adequate in the sense that they do not provide pointwise measurements, thus not pinpointing the location of crack initiation, and not accounting for non-uniform strain distributions. This paper presents a digital image correlation (DIC) system for non-contact and full strain field measurements, conceived for the purpose of investigating the cracking behavior of HMA mixtures. The whole system was developed so as to account for the special nature of typical HMA testing configurations. An image matching technique (least squares matching) was employed for providing matches with sub-pixel accuracy. The performance of the method was investigated by several tests. The DIC system was shown to overcome the shortcomings of traditional on-specimen strain measurement devices achieving satisfactory accuracy compared to strain gauges.     

The incorporation of carbon nanofibres to enhance the interlayer adhesion of hot compacted single-polymer polypropylene composites

The current work is a major extension of two very different studies carried out previously to investigate factors that affect the peel strength of single-polymer composites produced by the Leeds hot compaction process. First, it was found that the peel strength was significantly increased by introducing interleaved films, of the same polymer, between the layers of woven oriented tapes that make up the composite. Secondly, it was shown that incorporation of carbon nanofibres (CNF) into the oriented tapes prior to hot compaction could also increase peel strength.In the present study we have investigated the amalgamation of these two approaches, in particular to see if there are synergistic advantages in the combination. Samples were produced with and without interleaved films, and with and without carbon nanofibres, located either in the oriented polypropylene tapes, in the interleaved film or in both. Maximum peel strength was achieved with the combination of the interleaved film and the incorporated nanofibres, but importantly this could be achieved with the CNF located only in the film. This has significant processing and performance advantages as the incorporation of CNF into the oriented tapes tends to limit the drawability of the polypropylene due to internal voiding around the particles.Scanning electron micrographs of the hot compacted composites show a strong correlation between the observed damage on the peel surfaces and the measured peel loads. It is shown that the peel load is dependent on the fraction of melted matrix at the interface and hence the interleaved films give additional matrix material at this point. It is also shown that the incorporation of CNF promotes fibrillation, and so increases the amount of energy absorbed during peeling.