Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"thermite"”.
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The thermite welding of cast iron
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Metallurgy, 1958.
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A fatigue model for thermite rail welds
… project was to examine the fatigue behavior of thermite-welded railroad rail and in particular the occurrence of fatigue defects in the rail head. A rail-head local-stress fatigue model (RAHELS) was developed to predict the type of rail-head defect that forms under a given set of operating …
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A Heat Transfer Modeling Study of Rail Thermite Welding
… of fatigue-critical weld defects in rail thermite welds. Finite Element Modeling (FEM) was used to analyze the heat transfer behavior during the thermite welding process. The results of the thermal analyses were correlated to the development of various weld defects and compared with …
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Nanocomposite thermite powders with improved flowability prepared by mechanical milling
Nanocomposite thermite powders are of interest to develop varieties of reactive parts and components. Manufacturing these components requires tailoring properties of the thermite powders such as their particle size distributions, particle shapes, and powder flowability. For example, an improved …
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Thermite welding process development for the repair of alloyed boiler tubes in power generation facilities
Includes bibliographical references (pages 102-105).
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Early Stages of the Aluminothermic Process: Insights into Separation and Mould Filling
… (SHS) type reaction for producing primarily thermite steel and alumina slag at high temperatures during the welding of rails. In this work, an investigation on the early stages of the aluminothermic process, the separation of AT reaction products and mould filling has been carried out, using …
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Fully dense aluminum-rich aluminum copper oxide powders for energetic formulations
The thermite reaction between Al and CuO is well known and highly exothermic. For a conventional thermite mixture comprising mixed metal and oxide powders, this reaction is rate limited by the slow heterogeneous mass transfer at the metal and oxide interface. The relatively low reaction rate and a …
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Influences of Reaction Parameters on the Product of a Geothermite Reaction: A Multi-Component Oxidation-Reduction Reaction Study
… of minerals, glass, and aluminum that exhibited thermite-type reaction behavior. Thermite reactions are a class of Self-propagating High-temperature Synthesis (SHS) reactions. Chemical reactions between raw minerals and a reducing agent, which exhibit thermite-type reaction behavior, are termed …
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An ultrafast thermal emission spectrometer for investigating temporal thermal emission of metal thin-films and their reactive derivatives
… for studying the reaction of nanolaminate thermites in both the temporal and spectral domains. 1mJ pulses from a Ti:Sapphire laser, stretched to 10ps, were focused onto sample films affixed to glass slides. The emission generated by the ablation of the films was collected and focused into a …
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Ignition mechanism in nanocomposites thermites
Nanocomposite thermites (n-thermites) have been actively investigated for a wide range of potential applications including propellants, explosives, and pyrotechnics. There have been several recent efforts aimed at understanding ignition mechanisms of nanocomposite reactive materials. Although …
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Modeling ignition and extinction in condensed phase combustion
The characteristics of ignition and extinction in thermites and intermetallics are a subject of interest in developing the latest generation of energetic materials. An experimental “striker confinement” shock compression experiment was developed in the Prof. Glumac’s research group at the …
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Acid Leaching of SHS Produced MgO/TiB2
… High-temperature Synthesis (SHS) thermite reaction involving magnesium oxide (MgO), titanium dioxide (TiO₂), and boron oxide (B₂O₃) forms titanium diboride (TiB₂) and MgO as final products. Selective acid leaching is used to remove the MgO leaving high purity TiB₂ powder. The SHS …
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Explosive initiation of tungsten based reactive materials in air
… tests conducted in these facilities. Well known thermite, intermetallic and reactive metal compounds were detonated in the smaller of the two facilities. Increased pressure and light emission were measured from these RMs as compared to tests of inert steel and no material (“bare”). Shockwave …
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Reactive solids under shock compression
… dissertation chemically reactive solids, such as thermites and energy absorbing molecular materials, under shock compression are explored. To drive shock waves into target materials, an apparatus to launch and monitor laser-driven flyer-plates was developed. This was coupled to a home built …
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Multifunctional reactive nanocomposite materials
… the reaction mechanisms in nanocomposite thermites, two types of nanocomposite reactive materials with the same bulk compositions 8Al-MoO_3 were prepared by different methods. One of the materials was manufactured by ARM and the other, so called metastable interstitial composite (MIC), by …