Papers by Keyword: Melt

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Authors: H.Y. Chin, C.C. Ling, S. Fung, C.D. Beling
Authors: Chang Liang, Kui Sheng Wang, Bing Luo
Abstract: In this paper, melting process in a co-rotating twin screw extruder was studied based on two dimensional melting model of flow field cross section. Positive displacement conveying characteristic in the melting section was assumed and melting process of each section was regarded as the result of time evolution. Procedure of melting was analyzed according to experiments and numerical simulations, both indicating that solid materials in the flight zones would melt firstly and carcass wrapped in the middle of melt would be molten finally. Liquid fraction contours showed that flow of hot melt played an important role in the melting process of cross section. Four types of melting mechanisms were summarized, in which viscous dissipation heat was discussed in detail, showing that viscous dissipation contributed about 10%-30% to the total energy needed during melting. Screw speed affected viscous dissipation significantly, while heating flux of barrel had little influence on it.
Authors: Victor Timofeev, Maksim Khatsayuk, Aleksander Aliferov
Abstract: The present article describes the analysis of electromagnetic field carried out by an analytical method in the system inductor–bath with melt (liquid metal) taking into account different winding characteristics of the inductor. It also defines integral and differential characteristics of the system for the most widespread windings of an MHD-stirrer.
Authors: Axel Griesche, F. Garcia-Moreno, M.P. Macht, Günter Frohberg
Abstract: The long-capillary method was used to measure chemical diffusion in molten AlNiCe alloys. The interdiffusion coefficients were determined for a mean concentration of Al87Ni10Ce3 at 1273 K and for a mean concentration of Al77Ni20Ce3 at 1373 K. The absence of major convection disturbances and of macro-segregation was demonstrated by time-dependent diffusion measurements. An in-situ x-ray monitoring technique for real-time concentration profile determination is presented.
Authors: Arkady A. Skvortsov, Sergey M. Zuev, Marina V. Koryachko
Abstract: The work is devoted to the study of contact melting in the Al-Si system, which is an aluminum film deposited on a silicon single-crystal substrate. The impulse action of high-density currents (j> 8.1010 A / m2) passing through an aluminum film is analyzed. It was found that under the considered electric heat loads in the system, the degradation processes associated with the appearance of a molten aluminum zone and subsequent contact melting in the metal-semiconductor system develop. From the analysis of contact melting processes, a technique for estimating the coefficients of multiphase diffusion in the system under consideration is a thin aluminum film-single-crystal silicon substrate.
Authors: V.I. Matyukhin, V.A. Dudko, N.V. Grebneva
Abstract: The article outlines the production of fibrous materials, discloses energy production targets for mineral wool items production, scrutinizes specific features of cupola process. Besides, the article presents the experimental research of mineral wool cupola process. Thus, the article describes the design of a cupola furnace, principles of its operation, and its main performance indicators. A summary of analytical and theoretical research of non-isothermal gas flow motion in shaft furnaces is presented herein. The results of the experimental studies of the patterns of change in gas-dynamic operation of the cupola furnace are also shown in the article. To assess the development of solid fuel combustion in the furnace, the laws that govern the changes in gas composition at the level of stockline have been studied. The results are shown in the Table. The analysis of the current state of thermal and gas-dynamic operation of the mineral wool cupola furnace yielded recommendations for optimization and performance enhancement of the operating cupola furnace.
Authors: Nini Pryds, Søren Linderoth, Jian Zhong Jiang
Authors: Vladimir Tsepelev, Viktor Konashkov, Vladimir Vjuchin, Arkadi Povodator, Ann Podolskaja
Abstract: The structure of multi-component metallic melts is presented. Typically, the phase composition of commercial melts is complex and these melts are nonequilibrium systems. The correlation between liquid and solid metallic states is shown. The principles of time-temperature treatment of steels and alloys are described. In all technologies investigated, the preparation of a melt by its temperature-time treatment leads not only to improvement but also to stabilization of the structure and properties of the metal from melt to melt.
Authors: Axel Griesche, M.P. Macht, Günter Frohberg
Abstract: We present diffusion measurements in metallic melts measured by capillary techniques and results of molecular dynamic simulations. The investigated systems are the binary alloy AlNi20 and the multicomponent bulk glass-forming alloy Pd43Cu27Ni10P20. The temperature range of interest reached from the glassy state to the equilibrium melt. In the glassy as well as in the deeply supercooled state, below the critical temperature Tc of the mode-coupling, theory (MCT), diffusion is a highly collective atomic hopping process. Both investigated systems show around Tc a change in the diffusion mechanism. Above the liquidus temperature, diffusion in Pd43Cu27Ni10P20 is a collective process whereas in AlNi20 the atoms diffuse probably by uncorrelated binary collisions. The influence of thermodynamic forces on diffusion in the liquid state of AlNi20 can be described by the Darken equation with an additional temperature independent correction factor (“Manning”- factor).
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