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Showing 1 to 20 of 26 for “"Aluminum-based"”.
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Enhancing reactivity of aluminum-based structural energetic materials
… such as peak blast pressure and blast impulse. Aluminum is a good candidate for such enhanced blast applications involving structural reactive warhead casings due to its high combustion enthalpy; however, under explosive loading, conventional aluminum casings expend little of the energetic …
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Improving reactivity of aluminum-based structural energetic materials
… A strong contender for this application is aluminum because of its high combustion enthalpy, but current aluminum blast casings do not expend much of this stored energy. Aluminum casings also tend to create fragments that are too large to ignite and provide blast enhancement. The objective …
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Optimization of enhancements to aluminum-based structural energetic materials
… that reacts in the detonation environment. Aluminum is a good candidate for this application due to its low cost, widespread availability, good manufacturability, and high enthalpy of combustion. Difficulty arises in the timely ignition of the aluminum. A plain aluminum case produces mostly …
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Cryomilling of Aluminum-based and Magnesium-based Metal Powders
… causing significant grain growth. In this work, aluminum-rich and magnesium-rich alloys of varying composition are produced by cryomilling and characterized by x-ray diffraction. A novel consolidation process called high shear powder consolidation (HSPC) is used to densify as-received and …
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Application of Machine Learning in Failure Prediction of Brazed-Aluminum Based Heat Exchangers
Brazed aluminum plate-fin heat exchangers (BAHX), extensively used by the natural gas liquid recovery and gas processing industry, are subject to a uniquely stressful and harsh environment that involves large thermal stresses due to steady-state and transient thermal loads, mechanical loads, …
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Synthesis and characterization of mechanically alloyed aluminum-based compounds as high energy density materials
… developed. These powders are intended to replace aluminum typically added to energetic formulations to increase reaction enthalpy and temperature. The new materials are metastable aluminum-based alloys, which enable achievement of substantially reduced ignition temperatures and accelerated bulk …
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The effects of case mass to charge mass ratio on aluminum-based structural energetic materials
… blast. Tests were conducted on three different aluminum based reactive materials and a steel baseline explore differences in initial blast overpressure, total energy release, and fragmentation as the case mass to charge mass ratio changes. Cylindrical cases with high explosive charges were …
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Multiphysics Modelling on the Effects of Composition and Microstructure during Tribocorrosion of Aluminum-based Metals and Structures
… structural integrity. A representative case is aluminum (Al) and its alloys, which exhibit good corrosion resistance in aqueous solution due to the protection provided by the passive layer. However, these naturally formed layers are thin and delicate, leaving the materials vulnerable to …
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Corrosion And Wear Resistance Of Titanium- And Aluminum- Based Metal Matrix Composites Fabricated By Direct Metal Laser Deposition
<p>Titanium- and Aluminum-based metal matrix composites (MMC) have shown favorable properties for aerospace applications such as airframes, reinforcement materials and joining elements. In this research, such coatings were developed by direct metal laser deposition with a powder-fed fiber coupled …
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Spectroscopic Measurements of the Combustion of Aluminum and Aluminum-Based Energetic Material Particles Using a Heterogeneous Shock Tube
Aluminum is a desirable component of propellants, explosives, and energetic materials due to the high energy release associated with its oxidation. Considerable research has been done on aluminum combustion, but questions remain about the behavior of aluminum particles, particularly at small …
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Inducing Liquid Evaporation with Hygroscopic Gels
… sweat by blocking the sweat glands. Typically, aluminum salts present in the antiperspirants dissolve in the sweat and create a temporary plug to cut the flow of sweat. However, there has been a long debate going on the safety concerns of aluminum-based antiperspirants. Although there is no …
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Mg-Al Layered Double Hydroxide: A Potential Nanofiller and Flame-Retardant for Polyethylene
… report deals with the investigation of magnesium aluminum based layered double hydroxide (LDH) as a potential nanofiller and flame-retardant for polymers with special reference to polyethylene. LDH is a mixed hydroxide of di- and trivalent metal ions that crystallizes in the form of mineral …
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Using Coagulation to Enhance the Performance of Filtration at the South Truckee Meadows Water Reclamation Facility
… Five different coagulants were tested including aluminum sulfate, ferric chloride, polyaluminum chloride, and two aluminum-based coagulants (CC2110 and CC2220). Results were compared with the U.S. EPA Guidelines for Water Reuse, the Nevada Administrative Code (NAC), and the California Department …
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Design of Lightweight Magnesium Alloys: Processing, Microstructure and Properties
… is 78% lighter than steel and 35% lighter than aluminum. Its high strength to weight ratio makes it an excellent material for applications in automotive, aerospace, and structural applications. It also possesses an elastic modulus and density comparable to human bone, which makes it an excellent …
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Design and Manufacture of an Ultrasonic Transducer for Long-term High Temperature Operation
… bandwidths. Two transducer designs were pursued based on two different piezoelectric crystals as the active element: gallium phosphate and lithium niobate. A high Curie temperature of 1200 째C for lithium niobate and a high phase transition temperature of 970 째C for gallium phosphate, make the two …
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Wastewater Carbon Diversion and Recovery via Primary Sludge Production, Thermal Hydrolysis, and Anaerobic Digestion
… comprehensive literature review showed that iron-based coagulants tend to show less negative impact than aluminum-based coagulants. This can be attributed to the reduction of ferric to ferrous ions in the course of anaerobic digestion (AD), which leads to a suite of changes in protein …
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Combined Application of Density Functional Theory and Molecular Mechanics Sampling Techniques to study Chemical Systems, from Intramolecular Rearrangements to Polymerization Reactions
… all possible conformers. In this case, using MM-based sampling methods followed by DFT computations can allow for a relatively accurate description of these systems. This work contains three studies. In chapter 2, the mechanistic details of Newman-Kwart rearrangement under oxidative conditions is …
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Adjuvant Interactions with Lipid Membranes and Their Effect on Cellular Immune Responses
… to adjuvanticity, previous studies suggested aluminum-based adjuvants (ABAs) have high affinity for sphingomyelin and cholesterol, which allowed them to activate dendritic cells exclusively through lipid sorting. This dissertation sought to understand how lipid interactions contribute to the …
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Experiment and modeling : ignition of aluminum particles with a CO2 laser
Aluminum is a promising ingredient for high energy density compositions used in propulsion systems, explosives, and pyrotechnics. Aluminum powder fuel additives enable one to achieve higher combustion enthalpies and reaction temperatures. Therefore, to develop aluminum based novel and customized …
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Metal based reactive nanocomposites prepared by cryomilling
Aluminum is one of the most commonly used metal fuel additives for propellants, explosives, and pyrotechnics. Recent interest has been focused on replacements for aluminum as fuel additives to achieve higher combustion temperatures and stronger pressure pulses for applications in advanced munitions …
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