Abstract: Using 7 pollutants as indicators, the Gleaner production level of the whole industry by sampling 45 Chinese metallurgical enterprises is evaluaed.
Abstract: The influences of oxide impurties or additives on the kinetics of the gaseous reduction of iron oxides have been systemically assessed, necessny quanitative analyses have been performed. The characteristics of the influences depend upon many experimental conditions involving the contents, of foreign oxides and their existing forms, and doping techniques, the initial chemical-composition and physical properties of the specimen, the reducing gas, reaction temperature as well as reaction fraction.
Abstract: Thermodynamic activities of gallium were measured between 1073 and 1273 K in the nonstoichiometric intermetallic compound Ni3Ga using an emf-method based on solid oxygen-conducting electrolytes. The partial molar enthalpies and entropies were derived from their dependence on temperature. The results of the activity measurements were interpreted in terms of a statistical-thermodynamic model for nonstoichiometric phases with the cubic Ll2-superstructure considering four types of point defects, i. e-antistructure atoms and vacancies on the nickel- and gallium-sublattice. The enerpies of formation of the point defects at the stoichiometric composition are used as adjustable parameter.
Abstract: Schematic description on theory of multi-dimensional mass flow control (MMFC) in Iron & Steel manufacturing process is proceeded from four aspects which are meaning, concept, research content of MMFC system in Iron & Steel manufacturing process and research base of MMFC in steelmaking plant.Applied the theory to high efficiency continuos casting, process analysis and synthetic research on all working procedures in converter plant are carried out, integrated optimization of various working procedures and their relationship in producion process is realized, and enormous economic benefit is obtained under the guide of global optimization principle.
Abstract: To the disadvantage of tranditional measurements of inclusions, a new method of on-line measurements, ESZ principle, is put forward. Based on experiments under low temperature and high temperature,on-line measturements of inclusions is proved to be practical.
Abstract: The kinetics of the gas desulphurizaion in BOF slags was studied. The influence of temperature, ΣFeO conent basicity and the atmosphere on the gas desulphurization rate in the slag was discussed in detail. Furthermore, the mechanism of the reaction and the controlling step in the gas desulphurization are analyzed and discussed.
Abstract: Heat treatment experiments were carried out to magnet powders prepared by crushing the sinteped NdFeB hard magnets, within the annealing temperature range from 700 to 1050℃. The results have shown tha the annealing treatment can effectively enhance the coercivity of the crushed powders, which is very low after the communtion, to relative high values. The microstructural changes of the magnet powders during the annealing were checked using optical and scanning electronic microscopes. It is found out that the magnet powders have many cracks in their surface layer caused by the mechanical crush, while their center parts remain free from crack. On the other side, the magnet powders after annealing treatment possess have few cracks in the surface layer. This change is considered as the result of the repairing effect of the annealing treatment to the damaged surface, which should be the reason for the enhanement of the coercivity of the magnet powders. Meanwhile, in the powders after annealing, more Nd-rich prticles can be observed evidently,some of which are determined as Nd-oxide. It indicates the ocurrence of oxidation is an other process happened during the annealing treatment,which should affect the recovery of the coercivity of the manget powders negatively.
Abstract: Zr52.5 Cu17.9Ni14.6Al10Ti5 bulk amorphous alloy was prepared by a water-cooled copper mold. The alloy system has an excellent glass formation ability (GFA) and a wide supercooled liquid region. The glass transition temperature (Tg), the crystallizaion temperature (Tx), the fracture stress, the plastic,Vickers hardness and elastic modulus for the bulk amorphous alloys with a diameter of 3 mm are 377.63℃,448.9℃,1 730 MPa, 0.5%, 558 and 82 GPa, respectively The bulk amorphous alloys have good mechanical properties. The excellen glass formation ability of Zr52.5Cu17.9Ni14.6Al10Ti5 alloys is presumably due to a combination of significatly differen atomic size ratios above about 12%, multicomponent alloy system consisting of more than three elements and optimum negative heats of mixing among the constituent elements.
Abstract: By the method of orthogonal design, the experimental work was carried out to simulate the industrial batch annealing. Using stepwise regression method to analyze the data gained in the experiment, the equations of relationship between processing parameters of batch annealing and mechanical properties of products have been established. And the effect of processing parameters of batch annealing on mechanical properties of IF steel sheet was investigated systematcally from mono-factor and poly-factor.
Abstract: The reaction mechanism of Fe-Ti-C system was studied by Deferent Thermal Analysis (DTA),X-Ray Analysis (XRD), Scanning Electron Micrograph (SEM) and other means during the reactive apglomerated spray powder flying when TiC-Fe cermet coatings were obtained by Reactive Flame Spray Synthesis (RFSS). It is revealed tha the reaction of Fe-Ti-C system happened step by step during the reactive spray powder flying, and basically finished when it reached the substrate, TiC-Fe materials were mainly synthsized when the spray distance is 125~170 mm. Therefore, Compared with the theditional oxygen-acetylene flame spray technology,the advantages of RFSS lied in simultaneous synteesis and deposition of expensive coating materials from an in-situ reaction of cheap raw materials.
Abstract: The chemical corrosive wear mechanism of electroless Ni-P coating under unlubricated wear was studied by test and theory and the possibility of as an anti-chemical corrosive wear coating on drill pipe was probed into. The results showed that electroless Ni-P coating appear mainly delaminate wear and lightiy abrasive wear under unlubricated wear. At the condition of unlubricated wear, it is not suited to eletroless Ni-P alloy as a protective coating on drill pipe.
Abstract: Technical problems encounered in the preparation of large area free standing thick diamond films are discussed. Cracking of deposited diamond wafers is mainly due to the huge thermal stress resulted from the big difference in linear expansion coefficients between diamond and the Mo substrae. While the status of the surface preparation of the substrate, the control and optimization of process parameters are also very important. In order to obtain crack free large area thick diamond wafers it is necessary to strictly control the every step of the whole deposition process.
Abstract: The theory of analysis of reinforced concrete beam is applied to the study of ceramic-lined steel composite pipe. A new formula of radial crushing strength of composite pipe is presented, which includes both the geometry sizes and the properties of the materials. The results obtained from this formula show thatthe greater the elastic modulus of ceramic lining is, the higher the radial crushing strength of the composite pipe is. This provides a valuable information for the structural design of the composite pipe.
Abstract: The relatonship between material corrosion and ocean envirnmental factors is studied.A feed forward network incorporated with prior knowledge is used to model the mapping between the corrosion rate and the environmental factors.The calculation results show that the model can give a better prediction of the corrosion rate than those given by BP model.
Abstract: The results of research on the healing in pure copper and carbon steel are shown herewith. The inner crack could be healed at elevated temperature. It suggests that the healing of long crack could depend on the "separate healing" mechanism, in which forming of partition is an haportant stage. It results in that the long crack transformed into a row of tiny smooth cracks and round holes. The diffusivity of Fe atoms to crack healing area is higher than other elements.
Abstract: Solid electrolyte based on perovskite-type BaCeO3 and SrCeO3 was reviewed. Microstructure and conductivity in different atmosphere were introduced while application was analyzed in detail. Applications in fuel cell, steam electrolysis cell, membrane reactor, gas sensor indicate tha these kinds of solid electrolytes may be prospective materials tha can be used in many fields.
Abstract: For the resolution of stability of ultrafine powders lubricant, the essential condition by which single particle and untrafine metal powders can disperse and suspend in liquld phases was analyzed. There result pointed out just because of the surface coating and the space-resistive effect, and only the thickness of surface-coating is larger than 4.2 nm, the stable suspending of ultrafine powders in oil can be realized.
Abstract: Both a magnetic drum, with a zero reference track and an incremental track, and responsive dedective magneto-resistance sensor has been described. A new magnetic rotary encoder has been developed.Magnetic encoders are quite rugged, offering reliable operation in environments where high vibration, temperature, moisture or dust may exist.
Abstract: Different textures of CVD diamond thin films are analyzed using the methods of pole figure and orientation distribution function. It is shown that the higher multiplicity leads to the higher appearance possibility of {110} fiber texture. The formation mechanism of {221} fiber texture by means of twinning effect is discussed. The importance of the systematic investigation on the relatonship between tetures and properties is emphasized, and the advanced methods for texture analysis are recommended.
Abstract: A new neural network model that incorporates a supervised mechanism into a fuzzy ART is investigated. The model can cope with supervised learning and unsupervised learning simultaneously, and has the ability of incremental learning. A few experiments of bearing pattern classification prove pefformance of the model and by comparing pefformance of the model with BP model. The results of experiments indicate tha the model has the ability of pattem classification and flexibility.
Abstract: The finite element method (FEM) is used to solve the Reynlds equaion and to perform the computer numerical simulation for the calculation of oil film thickness and the evaluation of the parameters and loading capacity of the oil film bearing considered under different rolling conditions. The forecasted film thickness from the computation and the gauge control graph are close co-related to the practical status.
Abstract: The tension leveling process is investigated in detail the bending moment decreasing period on the first bending roll. The result shows that the residual curvature is big enough to analyze the deformation of tension leveled metal strip. The tension leveling process of the metal strip on the second roll is much differentfrom that on the first roll. The calculation method of the elongation of the tension leveled metal strip on multiple rolls is discussed also.
Abstract: Based on the principle that the eyes of human beings can view the depth of filed. Three algorithms of generating steroscopy animation in virtual reality system were brough up. It expatiates their deduction,conclusions and utilities as well as simple analyses and comparisons.
Abstract: By way of vibration transducer and demodulation device, the parameter of the electric current,the pressure, the flow and the temperature of nitrogen and water of the equipment can be monitored, comprehensively and the goal of fault diagnosis and maintenance decision, the management of equipments can be achived. As a practical example described the monitoring and diagnosis system was described for gear box pot type furnace top of No. 5 BF at the Ironmaking Plant of WISCO.
Abstract: Deal with no-speed-sensor vector control current-inverter control, and the way of protect SCR when load ciruit open. The results showed that AC motor is filtered by LC filter.
Abstract: A kind of E/T scheduling problem with four penalty factor is discussed in order to determine the optimal sequences and optimal common due date. A method about how to determine common due date is presented, the concept of combinative penalty factor is proposed, and the structure of optimal solution is discussed.
Monthly, started in 1955 Supervising institution：Ministry of Education Sponsoring Institution：University of Science and Technology Beijing Editorial office：Editorial Department of Chinese Journal of Engineering Publisher：Science Press Chairperson：Ren-shu Yang Editor-in-Chief：Ai-xiang Wu ISSN 2095-9389CN 2095-9389
