Thermo%205%202009

Thermo%205%202009 - Mat E 510 Thermodynamics of Solids Mat...

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at E 510 Mat E 510 Thermodynamics of Solids Mat E 510 Thermodynamics of Solids Lecture #5 Yury Gogotsi A.J. Drexel Nanotechnology Institute and Department of Materials Science & Engineering, Drexel University, Philadelphia, Pennsylvania, USA
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Thermodynamic Properties of Fe-C-Si With time, ± Methods have been changed and improved ± Thermodynamic data and phase diagrams have been eveloped de e oped ± Many ternary phases were observed for different carbides ± It is possible to find data in literature for many carbides ¾ Compared to conventional cast on mechanical rength iron, mechanical strength, ductility, corrosion resistance and magnetic properties are significantly improved. N. Lebrun, C Fe Si, Physics and Astronomy Collection, Volume 11D2, Springer Berlin Heidelberg , 2008 2
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Thermodynamic Properties of ZrC and HfC 9 In the study, enthalpies were calculated using eating in high vacuum heating in high vacuum 9 The heat capacities, specific eats entrop ies reduced heats, entropies, reduced potentials of the carbides investigated were determined over the mperature range 298 temperature range 298- 2500 ~K. Composition used in the experiment ZrC: 88.1wt% Zr, 11.7wt% C, 0.2% bonded C A. S. Bolgar et al., Metallurgiya, 1(49), 40 43, 1967 HfC: 93.3wt% Hf, 6.3wt% total C, 0.1% bonded C
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Thermodynamics of TiC 9 The most common carbides are TiC and SiC hermodynamic state 9 Combustion synthesis: TiC starts melting after ~1700 o proportional to 9 Thermodynamic state functions can be used to calculate possible reactions of carbides with other aterials C proportional to composition which is important for determination of nthesis conditions materials 9 The reactions can be predicted using thermodynamic data synthesis conditions. (thermodynamic simulations) 9 Phase diagram of TiC have been developed and corrected many times, and it Q: There are already many ways to synthesize, so why do we need more studies? can be found in literature. 9 Synthesis conditions of carbides also may affect the properties A: Factors that should be improved 9 Purity 9 Reactivity ost J. B. HOLT, JOURNAL OF MATERIALS SCIENCE 21 (1986) 251 259 pp 9 Cost 9 Difficult conditions and time
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Simulations on hydrothermal reactions Factsage Software ©
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Simulation on hydrothermal reactions Factsage Software ©
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Thermal Decomposition of SiC SiC = Si(g) + C FactSage Software ©
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Thermodynamics of Solutions Why? Most phases of use are not pure but are solutions. They may have better properties.
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This note was uploaded on 02/12/2010 for the course MAT E 510 taught by Professor Yury during the Summer '09 term at Drexel.

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Thermo%205%202009 - Mat E 510 Thermodynamics of Solids Mat...

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