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Limited tests of molybdenum coated with molybdenum disilicide in a supersonic heated-air jet and brief description of the coating facility

Description: Report presenting a laboratory-scale vapor-deposition coating facility used in the field of high-temperature coatings. The vapor-deposition coatings were produced by the hydrogen reduction of halides and not by vacuum plating methods. The coated model was found to reach equilibrium temperature of about 3100 degrees Fahrenheit and was undamaged after 470 seconds at equilibrium temperature, while an uncoated model was destroyed in less than 6 seconds.
Date: January 9, 1958
Creator: Fields, E. M. & Wakelyn, N. T.
Partner: UNT Libraries Government Documents Department

Effect of Oxygen Content of Furnace Atmosphere on Adherence of Vitreous Coatings to Iron

Description: Note presenting a series of vitreous coatings of the same basic composition, but with cobalt-oxide contents varying from 0 to 6.4 percent by weight, which was fired on ingot iron in atmospheres consisting of various oxygen-nitrogen mixtures. Results of the investigation showed that a decrease in the amount of oxygen in the firing atmosphere necessitated an increase in the amount of cobalt oxide in the enamel if optimum adherence was to be secured.
Date: May 1955
Creator: Eubanks, A. G. & Moore, D. G.
Partner: UNT Libraries Government Documents Department

Investigation of Gases Evolved During Firing of Vitreous Coatings on Steel

Description: Note presenting an investigation of the gases evolved during the firing of vitreous coatings. The scope of the investigation included an examination of gas evolution with a microscope while specimens were being fired, examinations of fired specimens for changes in bubble structure with firing time, examination of changes in normal gas evolution when water-free enamels were used, analysis with the mass spectrometer of gases trapped in the bubble structure, determination of the source of carbon gases in the bubble structure with radioactive carbon as a tracer, and determination of the effect of various pretreatments of the clay used for suspending the coating slip on the resulting bubble structure of the fired specimens.
Date: January 1953
Creator: Moore, Dwight G. & Mason, Mary A.
Partner: UNT Libraries Government Documents Department

Carbide coatings on graphite

Description: From abstract: "A Method has been developed for the uniform coating of graphite tubes with carbides of niobium, tantalum, and zirconium by thermal composition of their respective halide vapors."
Date: 1957
Creator: Blocher, J. M., Jr.; Ish, Carl J.; Leiter, Don P.; Plock, Layne F. & Campbell, Ivor E.
Partner: UNT Libraries Government Documents Department

The nickel dip : a radioisotope study of metallic deposits in porcelain enameling

Description: Report discussing the use of radioisotope tracer techniques to study the following phenomena: the effect of nickel dip on the deposition of cobalt metal during firing of a cobalt-bearing ground coat, the effect of surface pretreatment on the amount and distribution of nickel deposited from nickel dip on enameling iron, and the effect of application and firing of cobalt-free and cobalt-bearing enamels on the chemical form and physical distribution of nickel previously deposited on enameling iron by the nickel dip.
Date: February 1956
Creator: Richmond, Joseph C.; Kirkpatrick, Harry B. & Harrison, William N.
Partner: UNT Libraries Government Documents Department

Studies of high-temperature protection of a titanium-carbide ceramal by chromium-type ceramic-metal coatings

Description: Report presenting an investigation to gain information concerning the durability of metallic coatings as affected by frit content, firing temperature, firing time, and number of coats. Four coatings of various frit content were prepared and applied to ceramals containing 80 percent chromium and 20 percent cobalt and heated at four different temperatures.
Date: June 1951
Creator: Moore, Dwight G.; Benner, Stanley G. & Harrison, William N.
Partner: UNT Libraries Government Documents Department

Relative importance of various sources of defect-producing hydrogen introduced into steel during application of vitreous coatings

Description: "When porcelain enamels or vitreous-type ceramic coatings are applied to ferrous metals, there is believed to be an evolution of hydrogen gas both during and after the firing operation. At elevated temperatures rapid evolution may result in blistering while if hydrogen becomes trapped in the steel during the rapid cooling following the firing operation gas pressures may be generated at the coating-metal interface and flakes of the coating literally blown off the metal. To determine experimentally the relative importance of the principal sources of the hydrogen causing the defects, a procedure was devised in which heavy hydrogen (deuterium) was substituted in turn for regular hydrogen in each of five possible hydrogen-producing operations in the coating process" (p. 269).
Date: July 12, 1951
Creator: Moore, Dwight G.; Mason, Mary A. & Harrison, William N.
Partner: UNT Libraries Government Documents Department

Relative importance of various sources of defect-producing hydrogen introduced into steel during application of vitreous coatings

Description: Report presenting a study in which heavy hydrogen (deuterium) was substituted in turn for regular hydrogen in each of five possible hydrogen-producing operations in the coating process. The gas that evolved when coated steel specimens fishscaled after firing was collected and analyzed with the mass spectrometer.
Date: February 1952
Creator: Moore, Dwight G.; Mason, Mary A. & Harrison, William N.
Partner: UNT Libraries Government Documents Department

Comparison of theoretically and experimentally determined effects of oxide coatings supplied by fuel additives on uncooled turbine-blade temperature during transient turbojet-engine operation

Description: From Summary: "An analysis was made to permit the calculation of the effectiveness of oxide coatings in retarding the transient heat flow into turbine blades when the combustion gas temperature of a turbojet engine is suddenly changed. The analysis is checked with experimental data obtained from a turbojet engine whose blades were coated with two different coating materials (silicon dioxide and boric oxide) by adding silicone oil and tributyl borate to the engine fuel. The very thin coatings (approximately 0.001 in.) that formed on the blades produced a negligible effect on the turbine-blade transient temperature response. With the analysis discussed here, it was possible to predict the turbine rotor-blade temperature response with a maximum error of 40 F."
Date: March 30, 1953
Creator: Schafer, Louis J., Jr.; Stepka, Francis S. & Brown, W. Byron
Partner: UNT Libraries Government Documents Department

Moisture Resistant Finishes for Airplane Woods

Description: This report describes briefly a series of experiments made at the Forest Products Laboratory, Madison, Wisconsin, to determine the comparative moisture resistance of linseed oil, impregnation treatments, condensation varnishes, oil varnishes, enamels, cellulose varnishes, rubber, electroplated and sprayed metal coatings, and metal-leaf coatings when applied to wood. All coatings except rubber and electroplated metal coatings, which were not developed sufficiently to make them practical, admitted moisture in varying degrees. The most effective and most practical coating was found to be that of aluminum leaf.
Date: 1921
Creator: Dunlap, M. E.
Partner: UNT Libraries Government Documents Department

Experimental Study of the Coating Formed on Nitrided-Steel Piston Rings During Operation in Nitrided-Steel Cylinders

Description: Report presenting a study of nitrided-steel piston rings in nitrided-steel cylinder barrels, which showed material of high reflectivity on their running faces. The structure of the material could not be resolved at a magnification of 1500 diameters. Results regarding the occurrence of coating, thickness of coating, height of coating above the nominal surface, chemical characteristics, physical characteristics, metallurgical change, and additional tests are provided.
Date: March 1944
Creator: Bobrowsky, A. R.; Kittel, J. Howard & Boegli, Charles P.
Partner: UNT Libraries Government Documents Department

Experimental Investigation of Air-Cooled Turbine Blades in Turbojet Engine 13: Endurance Evaluation of Several Protective Coatings Applied to Turbine Blades of Nonstrategic Steels

Description: Memorandum presenting an investigation of the durabilities of several protective coatings applied to air-cooled gas turbine rotor blades of nonstrategic steels in modified turbojet engines. Four types of coatings (ceramic, nickel, Nicrobraz, and aluminized) were applied to a total of 20 blades.
Date: July 16, 1953
Creator: Bartoo, Edward R. & Clure, John L.
Partner: UNT Libraries Government Documents Department

The Galvanic Corrosion Theory for Adherence of Porcelain-Enamel Ground Coats to Steel

Description: Note presenting an investigation of the galvanic corrosion theory of adherence between ground-coat porcelain enamels and steel as part of a broad study of the bonding mechanism between ceramics and metals. The theory is based on the mechanical anchoring of the enamel into the pits formed by the galvanic attack of the enamel on the steel surface.
Date: June 1953
Creator: Moore, D. G.; Pitts, J. W.; Richmond, J. C. & Harrison, W. N.
Partner: UNT Libraries Government Documents Department

A Study of Ceramic Coatings for High-Temperature Protection of Molybdenum

Description: Note presenting some results that have been obtained so far on ceramic coatings for molybdenum. The results indicated that the oxidation of the molybdenum was greatly retarded by the best of the ceramic coatings tried. Protection is possible in oxidizing atmospheres at gas temperatures up to 3500 degrees Fahrenheit.
Date: July 1948
Creator: Moore, D. G.; Bolz, L. H. & Harrison, W. N.
Partner: UNT Libraries Government Documents Department

Study of Chromium-Frit-Type Coatings for High-Temperature Protection of Molybdenum

Description: "The achievement of more compact and efficient power plants for aircraft is dependent, among other factors, on the perfection of heat-resisting materials that are superior to those in current use. Molybdenum is one of the high-melting metals (melting point, 4750 F). It is fairly abundant and also can be worked into many of the shapes required in modern power plants. To permit its widespread use at elevated temperatures, however, some means must first be found to prevent its rapid oxidation" (p. 1).
Date: July 1951
Creator: Moore, D. G.; Bolz, L. H.; Pitts, J. W. & Harrison, W. N.
Partner: UNT Libraries Government Documents Department

Review of an Investigation of Ceramic Coatings for Metallic Turbine Parts and Other High-Temperature Applications

Description: Note presenting an investigation to develop ceramic coatings that will prolong the life of alloys used in turbines, especially the blades, or permit their use at higher temperatures than would otherwise be predictable. Several steps were taken in order to establish whether or not protective coatings can be developed that will effect such an improvement.
Date: March 1947
Creator: Harrison, W. N.; Moore, D. G. & Richmond, J. C.
Partner: UNT Libraries Government Documents Department

Measured energy savings from the application of reflective roofsin 2 small non-residential buildings

Description: Energy use and environmental parameters were monitored in two small (14.9 m{sup 2}) non-residential buildings during the summer of 2000. The buildings were initially monitored for about 1 1/2 months to establish a base condition. The roofs of the buildings were then painted with a white coating and the monitoring was continued. The original solar reflectivities of the roofs were about 26%; after the application of roof coatings the reflectivities increased to about 72%. The monitored electricity savings were about 0.5kWh per day (33 Wh/m2 per day). The estimated annual savings are about 125kWh per year (8.4 kWh/m2); at a cost of $0.1/kWh, savings are about $0.86/m2 per year. Obviously, it costs significantly more than this amount to coat the roofs with reflective coating, particularly because of the remote locations of these buildings. However, since the prefabricated roofs are already painted green at the factory, painting them a white (reflective) color would bring no additional cost. Hence, a reflective roof saves energy at no incremental cost.
Date: January 14, 2003
Creator: Akbari, Hashem
Partner: UNT Libraries Government Documents Department

TEM Studies of Carbon Coated LiFePO4 after Charge DischargeCycling

Description: Carbon coating has proven to be a successful approach toimprove the rate capability of LiFePO4 used in rechargeable Li-ionbatteries. Investigations of the microstructure of carbon coated LiFePO4after charge discharge cycling shows that the carbon surface layerremains intact over 100 cycles. We find micro cracks in the cycledmaterial that extend parallel to low indexed lattice planes. Ourobservations differ from observations made by other authors. However thedifferences between the orientations of crack surfaces in both studiescan be reconciled considering the location of weak bonds in the unit celland specimen geometry as well as elastic stress fields ofdislocation.
Date: November 30, 2006
Creator: Gabrisch, H.; Wilcox, J. & Doeff, M.
Partner: UNT Libraries Government Documents Department

Effect of sliding velocity on friction properties and endurance life of bonded lead monoxide coatings at temperatures up to 1250 degrees F

Description: Report presenting studies to determine the effect of sliding velocity and ambient temperature on the friction properties and endurance lift of thin lead monoxide coatings bonded to type 440-C martensitic stainless steel. Results regarding the effect of run-in on endurance life are also provided.
Date: May 16, 1958
Creator: Sliney, Harold E.
Partner: UNT Libraries Government Documents Department

Corrosion Embrittlement of Duralumin 4: The Use of Protective Coatings

Description: Although the corrosion resistance of sheet duralumin can be greatly improved by suitable heat treatment, protection of the surface is still necessary if long life under varied service conditions is to be insured. The coatings used for this purpose may be grouped into three classes: the varnish type of coating, the oxide type produced by a chemical treatment of the surface, and metallic coatings, of which aluminum appears to be the most promising. Since the necessary weather exposure tests are not complete, some of the conclusions regarding the value of various surface coatings are necessarily tentative.
Date: April 1928
Creator: Rawdon, Henry S.
Partner: UNT Libraries Government Documents Department

High-Temperature Attack of Various Compounds on Four Heat-Resisting Alloys

Description: Note presenting an investigation of 61 compounds, all of which might logically be used in coatings, which were tested by placing a small pulverized sample of each compound on the cleaned surface of an alloy specimen and heating in air for 17 hours at 1500 degrees Fahrenheit. Of the four alloys tested, Hastelloy B was found to be the most susceptible to heavy attack by the more corrosive coating ingredients when heated in air.
Date: October 1948
Creator: Moore, D. G.; Richmond, J. C. & Harrison, W. N.
Partner: UNT Libraries Government Documents Department