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Showing 1 to 20 of 611 for “"Powders"”.
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Laser cladding with metallic powders
The influence of the powder material and the main processing parameters on geometrical features and dilution of the clads is investigated and discussed. Physical and analytical model that allow the explanation of the process and the prediction of the clad geometry and dilution is discussed. Using …
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Oxidation kinetics of metallic powders
… kinetics of aluminum, magnesium and Al-Mg alloy powders in different oxidizing environments are investigated using thermo-analytical measurements. New methods of data processing are developed, relying on measured particle size distributions of the reactive spherical powders. It became possible to …
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Phytoremediation of nitroglycerin in smokeless powders
This study evaluated the feasibility of rhizosphere-enhanced phytoremediation in the removal of nitroglycerin (NG), as applied in commercial smokeless powder from soil. Double base smokeless powder was applied to soil mesocosms at rates of 0, 1.0, 5.0 and 10% (w/w). Nitroglycerin-contaminated …
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Zinc alloy powders for alkaline batteries
<p>"Zinc (Zn) powders form the anode of a modern alkaline battery. During discharge of the battery, zinc oxidizes to produce zinc oxide and electrons. Alkaline batteries are prone to leakage during storage. This phenomenon is caused by zinc dissolving into the alkaline solution and producing …
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The synthesis of beta alumina powders
… precursors were used to synthesize beta alumina powders by the high temperature solid state reaction with soda and lithia, resulting in powders with a nominal composition of Li₀.₃₈Na₁.₆₅Al₁₀.₆₆O₁₇. The solid state reactions were monitored by differential thermal analysis and thermogravimetric …
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Heat transfer, by radiation, in powders
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Metallurgy, 1960
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Sonoelectrochemical synthesis of submicron metal powders
… and demonstrated to produce submicron copper powders. Improvements to the batch reactor design are proposed to extend the technique to a flow reactor useful for commercial production of submicron metal powders.
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The agglomeration of zinc oxide powders
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1962.
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Continuous blending of dry pharmaceutical powders
Conventional batch blending of pharmaceutical powders coupled with long quality analysis times increases the production cycle time leading to strained cash flows. Also, scale-up issues faced in process development causes delays in transforming a drug in research to a drug under commercial …
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Surface Free Energy Characterization of Powders
… free energy components model, various talc powders were characterized in terms of their acidic and basic properties. It was found that the magnitude of the Lewis electron donor, gS-, and the Lewis electron acceptor, gS+, components of surface free energy is directly related to the particle …
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Reduction expansion synthesis for magnetic alloy powders
… molding (MIM) is the availability of fine powders to manufacture small, complex, metal parts. There are technological limits to the minimum particle size that can be produced using available low cost techniques, which is approximately 10 microns. This minimum particle size in turn limits …
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Three dimensional printing with fine metal powders
… of print parameters on printing with fine metal powders have been examined. Powder spreading experiments were conducted to examine the limits of layer thickness and packing density. 420 ss, S-7 tool steel, and 316L ss powderbed beds were generated in fifty micron layers. Packing densities of 55%, …
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Low Frequency Dielectric Investigations on Hydrated Pharmaceutical Powders
Measurements of dielectric properties on hydrated systems at low frequencies, present particular difficulties with regard to the phenomenon of electrode polarisation, which can mask the dielectric properties of the sample. The reproducibility of DRS measurements on powdered systems has also been …
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Direct selective laser sintering of aluminium alloy powders
… experimental evidence, the SLS/SLM of aluminium powders could be categorised into full melting (SLM) which was found to have occurred in both pure and pre-alloyed aluminium powders, and binary liquid phase sintering (SLS) which occurred in blended bimodal or trimodal powders. That successful …
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Incorporation of Acid Whey Powders in Probiotic Yogurt
<p>Acid whey powder (A WP) could be used as a functional ingredient for the manufacture of yogurt to obtain benefits that include probiotic effect, nutraceutical benefits, texture improvement, reduced syneresis, and cost effectiveness. Probiotic yogurts, control and that supplemented with …
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Synthesis and characterization of metal-based reactive powders
… materials are prepared and characterized. For powders with Fe, Ni, or Zn additives, the particles consist of an aluminum matrix and inclusions of Fe, Ni, or Zn comprising 10 at % of the bulk composition. For additives of Ni and Zn, only short milling times can be used to prepare composites; …
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Alternating current electroluminescent properties of zinc sulfide powders
… electroluminescent properties of zinc sulfide powders the following experiments were conducted: synthesis of zinc sulfide phosphors (comprised of zinc, sulfur and copper dopant); thermal shocking of phosphor materials (sudden cooling, using liquid nitrogen, of phosphor particles heated up to …
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Spheroidization of iron powders by radiative heat transfer
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1999.
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Preparation and characterization of praseodymium oxide films and powders.
… of the green films. Praseodymium oxide powders were also successfully prepared by combining electrochemical methods with sintering processes. The praseodymium oxide powders were characterized by X-ray diffraction and Fourier transform infrared spectroscopy. The crystallite sizes of the …
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