Calculation of the ignition temperature of composite materials under high-temperature synthesis
Journal Title: Вісник Тернопільського національного технічного університету - Year 2015, Vol 78, Issue 2
Abstract
Energy saving technology of the high-temperature synthesis is one of the competitive processes of modern production. The high-temperature synthesis is the kind of combustion, which produced valuable solids by moving wave chemical reaction in a mixture of reagents to form a solid end products. The high temperature process is characterized by the absence of external energy, simple process, using powders obtained after utilization. Analysis of the papers dealing with the properties of the composite materials showed, that materials such as titanium, carbon, iron, boron received the most industrial applications for use in high temperature regimes. In the article we calculated the ignition temperature of the composite material TiFe-20C-2B, which was received under the high temperature synthesis. Analytically we solved boundary value problem according to the indirect method (Laplace method) for the cylindrical blank of the composite material. We modeled heat process in the combustion stage for schematic model of the movement of the flame with speed u in cylindrical blank. We got the ignition temperature (161°C = 434,5K) of the high-temperature process for the composite material TiFe-20C-2B. This resut is the basis for further research to determine the maximum temperature. In the article we presented the results of the simulated temperature range of all high-temperature processes, as well as the distribution of temperature range plugs for the composite material TiFe-20C-2B using software ANSYS. Graphic results distribution range of the ignition temperature and maximum temperature of the high-temperature synthesis confirmed mathematical calculations by Laplace (or indirect method). We used numerical modeling procedures Steaty-State Thermal, finite element method in software package ANSYS for a detailed analysis of the temperature of the start combustion and maximum temperature of the high-temperature synthesis of the cylindrical blank and thin bushings. The resulting solution of the Laplace transform method and an alternative solution using software package ANSYS makes it possible to compare the convergence of computing. The use of numerical and analytical methods enables to complex analyze thermal, physical and chemical processes in a cylindrical detail of the composite material, which we received during the high-temperature synthesis.
Authors and Affiliations
O. Onyshchuk
Keywords
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