Eutectic Temperature
Mostrando 25-36 de 39 artigos, teses e dissertações.
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25. Analysis of the application potentiality of nodular cast iron ASTM A536 60-40-18 as raw material for thixoforming processes / Estudo da potencialidade da aplicação do ferro fundido nodular ASTM A536 60-40-18 como materia prima para processos de tixoconformação
This work analyses the thixoability, the viability of actual production of thixotropic semi-solid of ferritic nodular cast iron ASTM A536 60-40-18, as well as the phase transformations taking place in the process. Thixoability evaluation is made through thermal analysis by Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC) tests
Publicado em: 2009
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26. Estudo da influência das temperaturas de austenitização nas propriedades mecânicas do ferro nodular austemperado a partir da zona crítica
In the present work the influence of austenitizing temperature on mechanical properties Austempered Ductile Iron from intercritical austenitizing temperature ranges was investigated. A heat treatment for development of material with improved mechanical properties for application in suspension parts is shown. Samples of alloyed ductile iron with a fully ferri
Publicado em: 2009
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27. Parametros termicos e estruturais em ferros fundidos cinzento e nodular solidificados em moldes de areia e unidirecionalmente / Thermal and structural parameters in gray and ductile cast irons solidified in sand molds and under unidirectional conditions
In the present work unsteady state unidirectional solidification of a hypoeutectic gray cast iron and of a eutectic ductile cast iron is applied to analyze the influence of the process parameters an the flake and nodule count. For comparison purpose some samples were cast in sand molds. The experimental results of temperature variation in the casting were us
Publicado em: 2009
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28. Influência de parâmetros microestruturais no comportamento tribológico de ligas ferrosas multicomponentes / Influence of microstructural parameters on the tribological behavior of multicomponent ferrous alloys
The aim of this work is to evaluate the effect of microstructural parameters (eutectic carbides and matrix hardness) of multi-component ferrous alloys on tribological behavior in sliding wear and micro-abrasive wear. The samples were two series of alloys with variable vanadium (V serie) and molybdenum (M serie) contents and fixed amounts of other elements. E
Publicado em: 2007
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29. Phase transformations and microstructures of alloys in the Nb-Cr-Al system / Transformações de fase e microestruturas de ligas no sistema Nb-Cr-Al
The interest for new structural materiaIs for application in high temperature has created a large volume of publications concerning refractory metal-based alloys that contain intermetallic compounds. The low fracture toughness of those alloys leads to the search of combination of phases that guarantees high strength and ductility. In such a case, the best ch
Publicado em: 2005
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30. Fadiga térmica de ferros fundidos brancos multicomponentes. / Thermal fatigue of multicomponent white cast iron.
The effects of the volume fraction of eutectic carbides and of the matrix hardness on the thermal fatigue resistance of multicomponent white cast iron were investigated. Alloys Fe-4Cr-V-2Mo-2W-2C, V ranging from 5 to 8 wt% and Fe-4Cr-8V-Mo-2W-2C, Mo ranging from 2 to 5 wt % were used. Disc shaped samples were quench and tempered for obtaining two matrix micr
Publicado em: 2003
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31. Avaliação do diagrama de fases Ni-Al-Nb e obtenção da estrutura eutetica NiAl-NiAlNb
The solidification of an eutectic alloy results in two or more solid phases, which grow in cooperative form. Such phenomenon makes this type of alloy interesting for obtainment of in situ composites. An in situ composite shows different properties than the individual component phases, that can result in a material with interesting features with regards to me
Publicado em: 2002
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32. Avaliação das condições de crescimento direcional do material composito in situ SnSe-SnSe2
The Sn-Se eutectic solidification allows one to obtain a lamellar structure, formed by SnSe and SnSe2 compounds, which are p and n semiconducting types, respectively. The SnSe-SnSe2 eutectic composite is a promising material to be used in photovoltaic device manufacturing. In this work, the Sn-Se alloy corresponding to eutectic composition was studied by usi
Publicado em: 1998
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33. Estudo dos sistemas binarios Fe-Pr e Fe-Nd em torno de suas respectivas regiões euteticas
The aim of this thesis is to better resolve the two sequencial thermal events, which appear in the differential thermal analysis of alloys, with compositions around the eutectic regions of the Fe-Pr and Fe-Nd systems. We intend to verify if these events have relation with metastable magnetic phases which are observed in as-cast alloys in both systems, and to
Publicado em: 1997
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34. Diagramas de fases Al-Cr, Cr-Nb e secçãoAl-Cr-Nb a 1000 C
t: The AI-Cr-Nb system appears as an interesting system in the field of superalloys. The purpose of his work is to revise the isothermal section AI-Cr-Nb at 1000°C as well as to verify the binaries AI-Cr and Cr-Nb. The AI-Cr phase diagram consists af a peritectic reaction at 1315° C, , between the liquid and (Cr) phases, which on cooling results in the Al8
Publicado em: 1991
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35. Thermal behavior of a pharmaceutical solid acetaminophen doped withp-aminophenol
Thermal behavior of a series of acetaminophen (APAP) doped withp-aminophenol (PANP) was studied by differential scanning calorimetry (DSC) to determine whether it exhibited a eutectic system. Within the temperature range of 120 to 200° C, accurately weighed (1–2 mg) samples sealed in hermetic pans were calorimetrically scanned with a low scanning rate of
Springer-Verlag.
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36. van't Hoff-van der Waals osmotic pressure and energy transformers
We find the van't Hoff relations between osmotic pressure, freezing point depression, and boiling point elevation provide a clue on how, by using salt solutions, one may lower the cost of extracting power from low-grade heat sources. In particular, the ratio of 7 between the heat of evaporation and the heat of freezing of pure water suggests a chemical syste