3,079 Matching Results

Search Results

Advanced search parameters have been applied.

Protective Coatings for Molybdenum

Description: Report discussing studies on various types of protective coatings for a molybdenum sheet. Procedures, materials, and results of each coating are included.
Date: February 17, 1953
Creator: Powell, Carroll F.; Jones, R. P.; Secrest, A. C.; Sherwood, E. M. & Campbell, Ivor E.
Partner: UNT Libraries Government Documents Department

Molybdenum; Its Ores and their Concentration with a Discussion of Markets, Prices, and Uses

Description: From Scope and Purpose of Investigation: "The direct purpose of the bulletin is, on the one hand, to prove to possible consumers of molybdenum that the element is not as rare as commonly supposed, and that this country possesses many deposits of low-grade ore from which large supplies may be derived, and on the other hand, to prove to present and prospective producers of molybdenum that there is a latent market for their product in the alloy-steel trade, which needs only the assurance of steady supplies for a considerable development."
Date: 1916
Creator: Horton, Frederick W.
Partner: UNT Libraries Government Documents Department

The Climax Molybdenum Deposit, Colorado

Description: From abstract: The largest single metal-mining operation in the history of mining in Colorado has been developed at Climax, as a result of the increased use of molybdenum in the steel and other industries. Production of molybdenum at Climax was notable for a short period during the World War; it ceased from April 1919 to August 1924 but since then has shown a steady increase. In 1930 from 1,000 to 1,200 tons of ore was milled daily, using only one unit of the 2,000-ton mill. The mine has a reserve of broken ore sufficient to furnish 2,000 tons daily for 3 years and is being developed to continue to furnish this and a still further increased output as the use of the metal may warrant.
Date: 1933
Creator: Butler, B. S. & Vanderwilt, J. W.
Partner: UNT Libraries Government Documents Department

Colorimetric Determination of Molybdenum in TF₄

Description: The following report discusses a colorimetric method for molybdenum involving the reaction between a molybdate, thiocynate, and some reducing agent, usually SnCL2, that has been in use in the steel industry for some time.
Date: 1945
Creator: Wick, L. B.; Weaver, B. S. & Gates, J. W.
Partner: UNT Libraries Government Documents Department

Molybdenum and Tungsten Structural Differences are Dependent on ndz2/(n + 1)ѕ Mixing: Comparisons of (silox)3MX/R (M = Mo, W; silox = tBu3SiO)

Description: Article discussing molybdenum and tungsten structural differences being dependent on ndz2/(n + 1)s mixing and a comparison of (silox)3MX/R (M = Mo, W; silox - tBu3SiO).
Date: July 15, 2008
Creator: Kuiper, David S.; Douthwalte, Richard E.; Mayoi, Ana-Rita; Wolczanski, Peter T.; Lobkovsky, Emil B.; Cundari, Thomas R., 1964- et al.
Partner: UNT College of Arts and Sciences

Effect of prestraining of recrystallization temperature and mechanical properties of commercial, sintered, wrought molybdenum

Description: Given three presumably identical lots of commercial, sintered, wrought molybdenum, the 1-hour recrystallization temperature of one lot remained above 2900 F by limiting the amount of effective restraining to 35 percent or less. Different recrystallization temperatures were obtained in various atmospheres, the highest in argon and the lowest in hydrogen. Metal thus fabricated and then stress-relieved possessed an ultimate tensile strength at room temperature within 10 percent of metal swaged 99 percent and also possessed equivalent ductility. At 1800 F, equivalent strength and ductility was obtained irrespective of the amount of swaging over the range of 10 to 99 percent.
Date: July 1953
Creator: Dike, Kenneth C. & Long, Roger A.
Partner: UNT Libraries Government Documents Department

Some factors affecting fabrication and high-temperature strength of molybdenum disilicide

Description: Report presenting an investigation of the properties of molybdenum disilicide in which a fine-grain material and a large-grain material were produced using different methods. Results regarding the fine-particle sintered material, coarse-grain, hot-pressed material, a comparison of the two materials, and the effect of oxygen on sintering and mechanical properties are provided.
Date: April 17, 1952
Creator: Maxwell, W. A.
Partner: UNT Libraries Government Documents Department

Properties of certain intermetallics as related to elevated-temperature applications 1: molybdenum disilicide

Description: Report presenting a method for the preparation and purification of the intermetallic molybdenum desilicide was developed and its properties were determined. Chemical properties were found to be highly inert, unattacked by boiling hydrochloric acid, sulfuric acid, or aqueous sodium hydroxide, slightly attacked by nitric acid, and dissolved by molten sodium hydroxide. Other mechanical properties of the material were also provided.
Date: October 6, 1949
Creator: Maxwell, W. A.
Partner: UNT Libraries Government Documents Department

Oxidation-resistance mechanism and other properties of molybdenum disilicide

Description: The outstanding oxidation resistance of molybdenum disilicide at 2400 F and above was found to depend on the formation of a protective siliceous coating which a-cristobalie has been identified. Molybdenum disilicide is not inherently resistant to oxidation and in powdered form burns at low temperatures.Melting and casting experiments have demonstrated the decomposition of the material at the melting point. The room-temperature modulus of elasticity has been determined and electric-resistivity data are given to 2000 F.
Date: March 14, 1952
Creator: Maxwell, W. A.
Partner: UNT Libraries Government Documents Department

Some stress rupture and creep properties of molybdenum disilicide in the range of 1600 to 2000 F

Description: Report presenting an investigation of the stress-rupture and creep properties of hot-pressed molybdenum disilicide, which explored the stress-rupture properties, use of molybdenum disilicide at various temperatures, long-time strength, and a satisfactory method for creep and stress-rupture testing.
Date: June 24, 1952
Creator: Maxwell, W. A.
Partner: UNT Libraries Government Documents Department

Preliminary investigation of plate-type molybdenum disilicide fuel elements for an air-cycle nuclear reactor

Description: From Summary: "Flat, plate-type elements, 3.5 by 0.5 by 0.070 inches in size and containing 10 percent elemental natural uranium, were produced by hot pressing. The elements were acid-treated to remove surface uranium and then coated with an alumina glaze. Such an element remained stable and did not lose detectable quantities of fission fragments in a 400-hour treatment at 1800 degrees F in a flux of 5 X 10 to the 11th power neutrons per square centimeter per second. Such elements are conveniently produced and, dependent on design and on the successful resolution of problems such as thermal shock, offer a possible method of increasing air-cycle element temperatures and related performance."
Date: March 27, 1953
Creator: Maxwell, W. A.
Partner: UNT Libraries Government Documents Department

Gettering Hydrogen at Ultra-Low Pressures by Evaporated Metal Coatings

Description: "Preliminary results are given for pumping neutral hydrogen gas in 1-second pulses by the gettering action of an evaporated coating of molybdenum. One second gas in-puts are observed at equivalent pumping speeds > 10-4 liters/second at 1 x 10-(-8) mm Hg in a 70-liter volume system. Base pressures <1 x 10-(-10) mm Hg are achieved by gettering with the static evaporated coating and pumping with a 4 in. oil diffusion pump simultaneously. Criteria for choice of gettering metal and a brief outline of pumping requirements for controlled fusion devices called Pyrotrons are included."
Date: November 1958
Creator: Milleron, Norman & Popp, E. C.
Partner: UNT Libraries Government Documents Department

Friction and wear investigation of molybdenum disulfide 2: effects of contaminants and method of application

Description: Report presenting a study using a low-speed kinetic-friction apparatus to show the effects of method of application and contaminants on the lubricating characteristics of molybdenum disulfide MoS2. Friction coefficients for the purified grade can vary from 0.025 to 0.12 just by changing the method of application.
Date: March 1954
Creator: Peterson, Marshall B. & Johnson, Robert L.
Partner: UNT Libraries Government Documents Department

Oxidation Characteristics of Molybdenum Disulfide and Effect of Such Oxidation on Its Role as a Solid-Film Lubricant

Description: Note presenting an investigation conducted to determine the oxidation characteristics of molybdenum disulfide and to determine the effect of such oxidation on its role as a solid-film lubricant. A coating of molybdenum disulfide serving as a high-temperature solid-film lubricant maintained low coefficient-of-friction values during its oxidation as long as an effective subfilm of the molybdenum disulfide remained.
Date: May 1949
Creator: Godfrey, Douglas & Nelson, Erva C.
Partner: UNT Libraries Government Documents Department

Effects of Some Metal Additions on Properties of Molybdenum Disilicide

Description: Memorandum presenting an investigation of the effect of the addition of approximately 6 percent nickel, cobalt, or platinum on some properties of molybdenum disilicide. These additions resulted in appreciably lowering the modulus-of-rupture strength from that of unalloyed molybdenum disilicide. Results regarding density and particle-size analysis, chemical analysis of bars, metallographic and x-ray analysis, density and resistivity, modulus-of-rupture strengths, thermal shock tests, and oxidation resistance are provided.
Date: May 4, 1954
Creator: DeVincentis, H. A. & Russell, W. E.
Partner: UNT Libraries Government Documents Department

Evaluation of Alloys for Vacuum Brazing of Sintered Wrought Molybdenum for Elevated-Temperature Applications

Description: Note describing the preparation and evaluation of 25 binary and ternary alloys with liquidus temperatures in the range of 2000 to 2500 degrees Fahrenheit as part of an investigation of potential brazing alloys for molybdenum for use at elevated temperatures. Three commercial alloys were also investigated.
Date: May 1954
Creator: Dike, Kenneth C.
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

Molybdenum: A Materials Survey

Description: Report issued by the U.S. Bureau of Mines discussing a survey conducted on molybdenum. History, geology, metallurgical properties, and production of molybdenum is presented. This report includes tables, illustrations, and maps.
Date: April 1957
Creator: McInnis, Wilmer & Creasey, S. C.
Partner: UNT Libraries Government Documents Department

Volatilization of Molybdenum During the Preparation of TF₄ and T₃O₈ from TF₄

Description: This report follows the study that was undertaken in an attempt to show how one of the elements held over in appreciable amounts in TF4 after conversion with TO3, molybdenum, acts during this transformation. Also of interest is the behavior of molybdenum during the reaction TF4 --> T3O2.
Date: 1945
Creator: Wick, L. B.; Weaver, B. S. & Gates, J. W.
Partner: UNT Libraries Government Documents Department