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A Thermal Type Flow Meter for Low Flow Rates of Anhydrous Hydrofluoric Acid

Description: Report discussing a thermal type flow meter which was adapted for metering anydrous hydrofluoric acid at low flow rates. Corrosive gases, which are not appropriate for handling in standard type rotameters or orifice meters, are also suitable for this thermal type flow meter.
Date: June 24, 1946
Creator: Johnsson, Karl Otto; Peed, W. F. & Clewett, G. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Chambers Works Process for the Manufacture of Fluorine in East Area Carbon Anode Cells (M.W.38.0)

Description: Historical: This process is based on experimental work done in Jackson Laboratory, Send Works, Blue Products, and East Area. It supersedes the Tentative Chambers Works Process for the Manufacture of Fluorine Using Carbon Anode Units, dated December 2, 1943.
Date: January 18, 1948
Creator: E. I. du Pont de Nemours & Company
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Separation of Metal Ions by Anion Exchange in Mixtures of Hydrochloric Acid and Hydrofluoric Acid

Description: Distribution coefficients were determined for the adsorption of more than 40 elements on anion-exchange resins from mixtures of HCl (0.1 to 12M) and HF (0.1-8M). Two resins, Dowex 1 x 10, 200 to 400 mesh and Dowex 1 x 4, 100 to 200 mesh, were used. Distribution coefficients were also determined for the adsorption of many elements on both resins from 0.1 to 12M HCl and 0.1 to 12M HF. Anion exchange in the presence of HF was found useful for separating impurities from various materials for their … more
Date: December 1978
Creator: Faris, J. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Corrosion Associated With Hydrofluorination in the Oak Ridge National Laboratory Fluoride Volatility Process

Description: Studies carried out on corrosion associated with the hydrofluorination- dissolution phase in the fused-salt Fluoride Volatility Process are summarized. Corrosion for hydrofluorination-dissolver vessels used in bench-scale and semiworks-scale process development at ORNL is discussed. The results of a study on construction materials for the dissolution phase are presented. Corrosion studies at ANL are described for comparison purposes. A full-size hydrofluorinator dissolver is described. (M.C.G.)
Date: November 15, 1961
Creator: Goldman, A. E. & Litman, A. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Corrosion-Resistant Materials for Hydrofluoric Acid : Progress Report

Description: Introduction: Among the many corrosion problems encountered in the production of uranium tetrafluoride and uranium metal from ores and concentrates, some of the most serious occur where hydrofluoric acid must be handled.
Date: June 15, 1953
Creator: Pray, H. A.; Fink, F. W.; Friedl, B. E. & Braun, W. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Wet Fluoride Studies: Calcium Plutonium (IV) Fluoride

Description: Laboratory studies have shown that the double salt, CaF2-PuF4, can be precipitated by rapid addition of hydro-fluoric acid to solutions containing 25 to 75 g Pu/1, caleium equimolar to plutonium, and 1 to 10 M HNO3. The precipitate, which is subsequently washed with water and dried to 300 degrees C in dehumidified, deoxygenated argon, can be reduced thermally by calcium to give high yields of plutonium metal.
Date: December 22, 1953
Creator: Branin, P. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A new device for filtering hydrofluoric acid and other strong acids. Information report

Description: During the course of a research problem involving hydrofluoric acid it became necessary to filter concentrated hydrofluoric solutions to remove various solid materials. The search for a suitable filter media finally led to the use of a commercially manufactured plastic material known as ``Sponge Teflon`` (polytetrafluoroethylone) which is produced by the DuPont Company. This material, which comes in 1/8 in. sheets, is used primarily as a gasket material in acid lines, and is impervious to all a… more
Date: July 9, 1948
Creator: Bell, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Environmentally Assisted Cracking of Commercial Ni-Cr-Mo Alloys - A Review

Description: Nickel-Chromium-Molybdenum alloys (Ni-Cr-Mo) are highly resistant to general corrosion, localized corrosion and environmentally assisted cracking (EAC). Cr acts as a beneficial element under oxidizing acidic conditions and Mo under reducing conditions. All three elements (Ni, Cr and Mo) act synergistically to provide resistance to EAC in environments such as hot concentrated chloride solutions. Ni-Cr-Mo alloys may suffer EAC in environments such as hot caustic solutions, hot wet hydrofluoric ac… more
Date: November 9, 2004
Creator: Rebak, R B
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Prediction of release-etch times for surface-micromachined structures

Description: A one-dimensional model is presented which describes the release-etch behavior of sacrificial oxides in aqueous HF. Starting from first principles and an empirical rate law, release etch kinetics are derived for primitive geometries. The behavior of complex three-dimensional structures is described by joining the solutions of constituent primitives and applying appropriate boundary conditions.The two fitting parameters, k{sub 1} and k{sub 2}, are determined from the simplest structure and descr… more
Date: May 1, 1997
Creator: Eaton, W. P.; Jarecki, R. L. & Smith, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Effects of Wet Etch Processing on Laser-Induced Damage of Fused Silica Surfaces

Description: Laser-induced damage of transparent fused silica optical components by 355 nm illumination occurs primarily at surface defects produced during the grinding and polishing processes. These defects can either be surface defects or sub-surface damage.Wet etch processing in a buffered hydrogen fluoride (HF) solution has been examined as a tool for characterizing such defects. A study was conducted to understand the effects of etch depth on the damage threshold of fused silica substrates. The study u… more
Date: December 22, 1998
Creator: Battersby, C. L.; Kozlowski, M. R. & Sheehan, L. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electrodeposition progress report, October 1--31, 1948

Description: The general points being considered in the construction of equipment for the production of High Level Postum Gauzes were mentioned in the last progress report. A more detailed discussion of the progress to date will be made here. The development work of plating postum out of hydrofluoric acid has proceeded to the point where it is desired to make some runs plating out quantities of postum from 10--250 units per gauze. The following points have been considered in a report for limited distributio… more
Date: December 31, 1948
Creator: Orban, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Buffered Electropolishing – A New Way for Achieving Extremely Smooth Surface Finish on Nb SRF Cavities to be Used in Particle Accelerators

Description: Future accelerators require unprecedented cavity performance, which is strongly influenced by interior surface nano-smoothness. Electropolishing (EP) is the technique of choice to be developed for high-field superconducting radio frequency (SRF) cavities. Electrochemical impedance spectroscopy (EIS) and related techniques point to the electropolishing mechanism of Nb in a sulphuric and hydrofluoric acid electrolyte controlled by a compact surface salt film under F- diffusion-limited mass transp… more
Date: May 1, 2009
Creator: Hui Tian, Charles Reece, Michael Kelley
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electrodeposition progress report, September 1--30, 1948

Description: Two difficulties which have been encountered in the attempts to prepare hydrofluoric acid solutions by precipitation and resolution are (1) dissolution of postum out of the solid precipitate leaving behind a solid bismuth compound and (2) the plastics used for a reaction vessel. Plastics tried have not held up under the combined effects of hydrofluoric acid, moderate heat, and alpha bombardment and the overall yield of the method is rather low. The plastics problem may be solved by the use of `… more
Date: December 31, 1948
Creator: Orban, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Basic Electropolishing Process Research and Development in Support of Improved Reliable Performance SRF Cavities for the Future Accelerator

Description: Future accelerators require unprecedented cavity performance, which is strongly influenced by interior surface nanosmoothness. Electropolishing is the technique of choice to be developed for high-field superconducting radiofrequency cavities. Electrochemical impedance spectroscopy (EIS) and related techniques point to the electropolishing mechanism of Nb in a sulfuric and hydrofluoric acid electrolyte of controlled by a compact surface salt film under F- diffusion-limited mass transport control… more
Date: May 1, 2009
Creator: H. Tian, C.E. Reece,M.J. Kelley
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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