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Showing 1 to 20 of 29 for “"tube furnace"”.
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Kinetics study of reduction/sulfidation of ZnO and zinc titanate powders in a drop-tube furnace
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995.
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Bench-scale fire toxicity measurements of polymers and cables
… and flow-through tests such as the steady state tube furnace (ISO TS 19700). Toxicity results for several different polymers under different fire scenarios have been compared using published data. It was apparent that the closed box test could not readily match the various ISO fire conditions …
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Recycling neodymium-iron-boron magnet alloy by direct sulfation with SO₂ gas
… were directly contacted with SO2 and O2 in a tube furnace. The variables investigated were temperature of the material bed and the ratio of SO2 to O2. The product from the tube furnace is then water leached to recover any of the converted neodymium sulfates. The leachate and solid residue were …
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Experimental studies of single particle coal combustion: Ignition, sulfur retention, and the contributions of morphology
… combustion experiments were conducted in a drop tube furnace facility in order to investigate various aspects of coal combustion. Included in the study were the effects of natural gas cofiring on particle ignition and sulfur capture in ash, and the effects of morphology on burning rates at …
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PREDICTING THE FORMATION OF CONDENSATION ASH FROM COAL COMBUSTION
… (CF) boiler, a pulverized-fuel (PF) and a drop tube (DT) furnace were considered.</p><p>Predictions were based on the hypothesis that condensation ash is formed through two consecutive steps: vaporization and recondensation. Metal-containing species in coal are believed to vaporize during high …
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A Chemical Pathway to the Formation of Chlorinated Compounds During Combustion
… in this work. Reactions were conducted in a tube furnace, and the products were trapped and analyzed by gas chromatography/mass spectroscopy. It was shown that the Deacon reaction was favored at higher temperatures. The chlorination of phenol in vapor phase was found to begin at temperatures …
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The magnetic properties of chromium-vandium alloys
… and vanadium were made using both induction furnace and a standard tube furnace. These samples were used to study the magnetic properties of these alloys. The Ne'el temperature was measured for the dilute solutions of Vanadium and the magnetic susceptibility was measured for solutions ranging …
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Diluted Magnetic Semiconductor Nanomaterials Fabrication by a Chemical Vapor Deposition Method
… deposited on a silicon surface downstream of the tube furnace. Variation of reaction temperature and Mn doping level were investigated on structure and properties of the as-grown nanomaterials. The as-grown nanowires and naorods are single crystalline wurtzite structure and possess a growth …
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Lessons Learned in Project Management of Repurposing an Obsolete Facility for Today's Use.
… free up valuable storage space, an obsolete dual tube furnace facility was repurposed to process legacy and newly generated reaction by-products for reuse and/or evaluation. These materials consist of magnesium oxide and unreacted chemicals including small amounts of uranium. They will be …
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Pressureless infiltrated alumina and zirconia based steel - MMCs
… melt infiltration using a high vacuum furnace. The effect of particle size and morphology on the formation of a ceramic network in-situ and MMC properties were investigated using three different alumina powders. The alumina/steel-MMCs were characterised for microstructure, Young’s …
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Desktop systems for manufacturing carbon nanotube films by chemical vapor deposition
Carbon nanotubes (CNTs) exhibit exceptional electrical, thermal, and mechanical properties that could potentially transform such diverse fields as composites, electronics, cooling, energy storage, and biological sensing. For the United States Navy, composites potentially provide a significant …
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Structure and Processing Relations in Ni-W Amorphous Particle Strengthened Ni Matrix Composites
… contamination from organic vapor present in the tube furnace used. While attritor milling effected smaller reinforcement particles, the small increase in aspect ratio would likely have been insufficient to cause significant strengthening by shear load transfer.
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Characterization of temperature profile in furnace and solubility of iron in silicon
… profile within a vertical high-temperature tube furnace as a function of depth and flow rate, (b) to use this information to diffuse iron into silicon at a known temperature, and (c) to measure the in-diffused iron concentration by comparing minority carrier lifetime measurements before and …
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Effect Of Germanium Doping On Erbium Sensitization In The Erbium Doped Silicon Rich Silica Material System
… were annealed in a controlled atmosphere tube furnace at temperatures between 500ºC and 1100ºC for 30 minutes. The photoluminescence spectra from the visible to the near-infrared region were acquired while pumping either near or far from the Er3+ absorption lines. Under both excitation …
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The dissolution of lime in iron silicate melts.
… atmosphere of argon at 1300°C in a vertical tube furnace. A small cylindrical pellet of lime was preheated to the melt temperature before being immersed in the melt contained in an iron crucible. After a preselected period, ranging from 10 seconds to 9 minutes, the pellet and crucible were …
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Synthesis, Characterization and Activity of Palladium Catalysts on the Dual Support of Cerium and Aluminum Oxides
… bed was controlled by a temperature -controlled tube furnace. The % methane in the effluent gas mix was measured by a gas chromatograph fitted with a flame ionization detector and a ‘Carbon Plot’ column. Palladium was present as PdO and PdOx x>2+ and cerium as CeOx (+3 and +4 oxidation states) as …
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Processing and Properties of Particulate Reinforced Carbon Matrix Composites
… of 100 °C. Heat treatment occurred in a tube furnace with a heating rate of 5 °C/min up to the heat treatment temperature, holding the temperature for 1 hour, then ramping back down to room temperature, all in an inert atmosphere. XRD was performed on heat treated samples before …
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Modeling and Synthesis of a Piezoelectric Ceramic-Reinforced Metal Matrix Composite
… powder samples were then annealed in a hydrogen tube furnace at 400°C, 500°C, and 600°C for one and five hours at each temperature. X-ray diffraction was performed on the as-milled and the annealed powders revealing that each was composed of the starting constituents in the appropriate …
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Experimental and numerical analysis of fuel cells
… SOFC fabrication by High Temperature vacuum Tube Furnace (HTVTF), and Gas Diffusion Layer and Gas Flow Channel (GDL-GFC) interfacial conditions with results based on commonly used relationships from the PEMFC literature. The modeling works reveal substantial impact on predicted GDL …
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Fine Particle and Mercury Formation and Control during Coal Combustion
… both coal combustion aerosols from a drop-tube coal combustor and coal pyrolysis products from a flat-flame coal pyrolyzer. The chemical composition of major species for both combustion organic aerosols and pyrolysis products are hydrocarbons, carboxylic acids and aromatic compounds. The …
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