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Showing 1 to 20 of 34 for “"Mechanical milling"”.
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Nanocomposite thermite powders with improved flowability prepared by mechanical milling
… in additive manufacturing. Arrested reactive milling (ARM) offers a versatile and practical approach for preparing various nanocomposite thermites with fully dense particles, which will retain their structures and mixedness between reactive components while being stored, handled, and …
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Production of steel matrix composites by mechanical milling and spark plasma sintering
… for the production of particle reinforced HWTSs. Mechanical milling (MM) and mechanical alloying (MA) have been considered as suited techniques for the production of powders showing higher sinterability and finer microstructure. Spark plasma sintering (SPS) has been used for the consolidation. As …
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Effects of high energy mechanical milling on the kinetics of solid state reactions
The effects of high energy mechanical milling on the kinetics of solid state reactions in two binary metallic systems, Al-Ni and Cu-Al, and two metal-oxide systems, Al-TiO₂ and Cu(Al)-CuO, have been investigated by using X-ray diffractometry (XRD), differential thermal analysis (DTA), differential …
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Production of strengthened copper materials by Mechanical Milling-Mechanical Alloying and Spark Plasma Sintering
… conductivities. In this PhD thesis initially mechanical milling (MM) has been considered as suited strengthening technique due to the severe strain hardening and microstructural refinement induced by severe plastic deformation during the process. Then an enhanced hardening has been obtained by …
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To develop a new mineral carbonation process that have a high efficiency in CO2 absorption into industry slag using low energy mechanical milling
… was experimentally studied by the utilization of mechanical grinding method. This research is to aim a development of new mineral carbonation process that has a high efficiency in the capture and storage of CO2 with low energy consumption. In the first stage of this study, the behavior of CO2 …
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Microstructure, Thermal Stability and Consolidation of Nanostructured and Ultrafine Structured Cu based Metal Matrix Composite and Alloy Powders Produced by High Energy Mechanical Milling
… particles were produced using two high energy mechanical milling (HEMM) routes respectively. The microstructural evolution of the as-milled Cu and Cu-Al2O3 composite balls/granules/powder particles produced using Route 1 (12hours) and Route 2 (Route 1 + 12 hours milling under another condition) …
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Thermal Stability, Microstructures and Mechanical Properties of Nanostructured/Ultrafine Structured Cu-5vol.%Al₂O₃ Nanocomposites Fabricated by High Energy Mechanical Milling and Powder Compact Extrusion
… powder particles were produced by high energy mechanical milling (HEMM) of a powder mixture of Cu powder and Al₂O₃ nanopowder. The nanocomposite powders were then annealed at 300-600°C for up to 5 h. The powders had a high thermal stability at temperatures up to 600°C. After annealing at 600°C …
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An investigation into the synthesis and characterisation of metal borohydrides for hydrogen storage
… storage media. A study has been made into the mechanical milling of metal chlorides with sodium borohydride to try to form homoleptic borohydrides. Mechanical milling of zinc chloride with sodium borohydride resulted in the formation of a covalent complex NaZn\(_2\)(BH\(_4\))\(_5\). Thermal …
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DEVELOPMENT OF COST EFFECTIVE NANOSTRUCTURAL REINFORCEMENTS FOR ADVANCED COMPOSITES
… applications. The main process in this study is mechanical milling which induce the in-situ transformation of carbon in the form of soot into complex nanostructures that behave as effective reinforcements. The soot mainly composed of amorphous particles with a high density of defects having a …
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Recovery Of Hydrogen And Helium From Their Mixtures Using Metal Hydrides
… Size reduction and activation of LaNi5 by mechanical milling was investigated using different milling parameters for the purpose of activating the material for hydrogen absorption. Because it has been shown that addition of aluminum to LaNi5 resulted in improved hydriding and dehydriding …
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Preparation, ignition and combustion of reactive metal-sulfur nanocomposites
Mechanical milling is applied to synthesize reactive metal-sulfur nanocomposites. Specifically, magnesium-sulfur, aluminum-sulfur and zirconium-sulfur nanocomposite powders are prepared. Each powder particle contained homogeneously mixed sulfur and respective metal. These materials are expected to …
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Production and characterisation of nanoparticulate silicon photovoltaic devices
… nanoparticles produced by means of high energy mechanical milling, as well as commercially sourced nanophase intrinsic silicon powder. Results from microscopy revealed that the nanoparticles had formed clusters that were capable of transporting charge through the device. Results from the …
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Metal based reactive nanocomposites prepared by cryomilling
… combustion dynamics. For both applications, mechanical milling offers a scalable and versatile method for modifying aluminum. The mechanical milling-based approach is explored in this effort using milling at the liquid nitrogen temperatures, or cryomilling, which enables mixing aluminum with …
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Synthesis and characterisation of metal oxides and fluorinated perovskite-related oxides
… prepared by conventional calcination methods and mechanical milling are shown by temperature programmed reduction to be more susceptible to reduction in a flowing mixture of hydrogen and nitrogen by the incorporation of cobalt. X-ray powder diffraction and Mossbauer spectroscopy show that in …
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Microstructure and mechanical properties of aluminium based nanocomposites strengthened with alumina and silicon carbide
… silicon carbide (SiC) nanoparticles. High energy mechanical milling (HEMM) with various milling times ranging from 6-12 hours was used to produce these samples. Optical microscopy, XRD, SEM, TEM and microindentation were used to characterize the milled powder and bulk samples. Bulk solid …
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Custom engineered nanomaterials for energetics and energy applications
… under room or cryogenic temperatures via mechanical milling. This offers a scalable and versatile method for modifying or creating nanostructured composite materials. Additionally, nano-composite films used for on-chip energetics are prepared using electrochemical etching via solutions …
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Development of a Acrylonitrile Butadiene Styrene toner for an electrophotography based additive manufacturing process
… with a suitable particle range and to assess the mechanical properties of parts produced using the toner developed through this route. The study is comprised for two parts; Chemical and Mechanical toner production. The chemical production method utilises a process, Evaporative Limited Coalescence, …
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Manufacturing of Poly(vinylidene fluoride) and Evaluation of its Mechanical Properties
… Further applications utilizing the changes in mechanical properties of piezoelectric polymers are being realized. Evaluating to what extent the mechanical properties will change with applied electric field and finding new ways to manufacture PVDF will lead to new applications of piezoelectric …
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Synthesis, microstructure and mechanical properties of bulk ultrafine grained Ti-47Al-2Cr (at%) alloy
… powders were produced using high energy mechanical milling of elemental Ti, Al, Cr powders in a retsch planetary mill. The microstructure and mechanical properties of the bulk consolidated alloy produced using different processing techniques has been investigated. The mechanical …
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Synthesis and characterization of novel fluoride and oxide cathodes for rechargeable batteries
… and the rutile polymorph was discovered upon mechanical milling. With simple synthesis and electrode preparation methods, both dirutile and rutile polymorphs of LiMnF4 showed electrochemical activity. Electron diffraction confirmed both polymorphs to convert upon lithiation along different …
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