Applications of thermal analytic techniques in materials engineering.
Item
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Title
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Applications of thermal analytic techniques in materials engineering.
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Identifier
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AAI9207093
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identifier
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9207093
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Creator
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Ledesma, Ramona.
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Contributor
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Adviser: Leslie Isaacs
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Date
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1991
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Chemical | Engineering, Materials Science
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Abstract
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This thesis studies the applicability of thermal analysis techniques to the task of determining thermal characteristics of various materials. An extensive investigation was conducted through an experimental program which featured the use of differential scanning calorimetry (DSC), differential thermal analysis (DTA), dilatometry, and thermomechanical analysis (TMA).;Differential scanning calorimetry (DSC) was employed to measure heat capacities of coal ashes in the temperature range from 150{dollar}\sp\circ{dollar}K to 900{dollar}\sp\circ{dollar}K. Some of the determined heat capacities were correlated with ash constitution. Ash samples were obtained from finely ground coal ranking from lignite to low volatile bituminous.;The minimum sintering temperature of coal ash powder was measured using a high temperature, push-rod dilatometer over the range from ambient to 1250{dollar}\sp\circ{dollar}K.;The applicability of differential thermal analysis (DTA) to determine the fusibility behavior of coal ashes was investigated between 300{dollar}\sp\circ{dollar}K and 1900{dollar}\sp\circ{dollar}K. This technique proved useful to obtain four specific temperature points which describe the fusion characteristics of coal ash. These points are: minimum sintering temperature, the softening point, the point of complete fluidity, and the reaction temperature which is tentatively identified as the eutectic temperature.;Thermomechanical analysis (TMA) and differential scanning calorimetry (DSC) was employed to study the effect of polyethylene terephthalate (PET) additives obtained from used soda bottles on the thermal properties of pure asphalt. This technique was used to determined the expansion coefficient, the glass transition temperature, the melting point, and the flow properties of asphalt, PET, and PET/asphalt mixtures samples. The temperature range used for these measurements was between 100{dollar}\sp\circ{dollar}K to 600{dollar}\sp\circ{dollar}K.;This thesis features a variety of useful applications of analytic thermal techniques and is intended to enhance our knowledge of existing methods and explore new techniques to determine thermal properties of different materials in materials engineering applications.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
