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Calculation of Thermodynamics and Process Simulation of YAG Ceramic Materials Via Combustion Synthesis Under Ultra-high Gravity Field

Author: JiWenWen
Tutor: SongYuePeng
School: Shandong Agricultural University
Course: Mechanical Design and Theory
Keywords: Yttrium aluminum garnet The thermodynamic data calculated Self-propagating high-temperature synthesis Adiabatic temperature System optimization selection Gravity technology Finite Element Analysis
CLC: TQ174.75
Type: Master's thesis
Year: 2010
Downloads: 46
Quote: 0
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Abstract


Yttrium aluminum garnet (referred to as YAG) transparent ceramics is developed rapidly in recent years, important advanced ceramic materials, YAG transparent ceramics become a hot research at home and abroad, especially in the field of laser. But for a long time, the materials preparation technology has been in use powder metallurgy process its preparation cycle length, high production costs, the quality is difficult to guarantee. Meanwhile, since the ceramic high melting point, costumes, difficult, and after the solidification of the high temperature ceramic form coarse tissue, few similar metal material molten casting process route to be prepared. Based on this, the Technical Institute of Physics of the Chinese Academy of Sciences has successfully developed on the basis of the Al2O3 transparent ceramics, etc., using a thermodynamic analysis, kinetic analysis, experimental and simulation theory and technology by means of hypergravity the Combustion Synthesis transparent YAG ceramic depth the research and come to better research, including the following. First, establish thermodynamic database based on thermodynamic principles, using VisualBasic language compiled thermodynamic data computing systems, and programming calculations reliability verification. Should follow the principle of the calculation results of the different system of self-propagating high-temperature synthesis adiabatic temperature analysis and system preferred synthesis of YAG ceramic system optimization options. The results show that the most suitable combustion synthesis of YAG ceramic using Al/NiO/Y2O3 System. Secondly, through static synthetic YAG Experimental Study: a certain impact on the burning rate of the raw material particle size and the briquette density would compacts thermite, this literature (Song Yuepeng, 2009) Conclusion. The high gravity casting technology is the combination of combustion synthesis technology and gravity technology, ultra-high temperature ceramic / metal hybrid melt thermite strong exothermic combustion synthesis system, and achieve the complete separation of the two. Gravity Field combustion synthesis of YAG ceramics experimental results show that the content of the ceramic metal particles in the body, how much pores and lattice defects associated with overweight force size, melt time is closely related to, thereby affecting the YAG the transparency of the ceramic. Finally, using ANSYS finite element analysis software, to simulate the high gravity combustion synthesis process of temperature and stress field, and the experimental results verify the reliability of the simulation results. The adiabatic temperature through the combination of the results of the finite element simulation of the temperature field and test data obtained gravity coefficient of multiphase melt separation and product densification investigated. Stress Field Simulation results show that the size and quality of the compact has a great influence on the stress field of the ceramic, and the thermal stress is reduced with the decrease of temperature.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Ceramics > Industrial ceramic
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