Download or read book Oxidation of Tungsten and Tungsten Based Alloys written by E. A. Gulbransen and published by . This book was released on 1962 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oxidation of Tungsten and Tungsten Based Alloys written by Westinghouse Electric Corporation. Research Laboratories and published by . This book was released on 1960 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oxidation of Tungsten written by Vincent David Barth and published by . This book was released on 1961 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents a detailed review of available information on the oxidation of W and its alloys. W is relatively inert below 700 C. As the temperature is increased above this level, however, oxidation becomes progressively more rapid, reaching catastrophic rates at temperatures around 1200 C and above. Various theories for the mechanism and rates of W oxidation at different temperatures are reviewed, and the effect of pressure and water vapor on the stability of W oxides is discussed in detail. The elevatedtemperature reactions of W with other materials, such as refractory oxides, and with gases other than oxygen also are covered. Information on the protection of W by alloying and coating is included. (Author).

Download or read book Oxidation of Tungsten and Tungsten Based Alloys written by and published by . This book was released on 1962 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rates of oxidation of W were determined from 1150 to 1 15 C in oxygen pressure of 2 to 100 Torr. Very high rates of oxidation or surface recession rates wer found above 1200 C. An exponential temperature behavior for the rate of oxidation was found for all of the pressure studied. A theoretical analysis of the data usi g the absolute reaction rate theory suggested that the rate of oxidation of tungsten was limited by a mobile absorption process of oxygen onto a tungsten surface already covered by a surface layer of oxide. Oxidation of a 50 w/o Ta-W alloy was studied over the temperature range of 1068 to 1458 C at 152 Torr oxygen pressure. A protective scale was formed on this alloy. The oxidation resistance was improved o a considerable extent over that of either of the pure metals or of other tu gsten-tantalum alloys. A special 250 kv electron diffraction camera was developed for the study of the W-gas reacting interface. Preliminary diffraction data were obtained on the oxidation of W between 800 and 1000 C. (Author).

Download or read book Oxidation of Tungsten and Tungsten Based Alloys written by Westinghouse Electric Corporation. Research Laboratories and published by . This book was released on 1960 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preparation of Tungsten and Its Alloys by Bomb Reduction written by Philip C. Good and published by . This book was released on 1961 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Temperature Oxidation Protection of Tungsten written by and published by . This book was released on 1969 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of the Properties of Tungsten and Its Alloys written by Union Carbide Metals Company. Metals Research Laboratories and published by . This book was released on 1960 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Temperature Oxidation Protection of Tungsten written by and published by . This book was released on 1969 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Review of Recent Developments in the Technology of Tungsten written by Vincent David Barth and published by . This book was released on 1961 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: This memorandum briefly reviews a number of current developments of general interest in the technology of tungsten. Most of this information was received during the period Aug through Oct 1961. Included in the discussion are: procedures for making W sheet; extrusion; annealing of W foils; fiber metallurgy; fabrication of W and W alloy single crystals; W alloys; and oxidation of W.

Download or read book Research on Criteria for Selection of Alloys and Surface Treatments for Inhibition of Tungsten Oxidation Part I Studies on the Chemical and Physical Properties of Ternary Phases Containing Tungsten and Oxygen written by Bert Phillips and published by . This book was released on 1964 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was made of reactions and equilibria as well as the properties of ternary phases which result, thermo physical and thermochemical properties of tungsten and tungsten-base alloy oxidation. Sealed capsules were used to equilibrate pelletized samples from which data were obtained on the condensed phase relations in the systems W-O, Ti-W-O, Ca-W-O, Sm-W-O, and Co-W-O. The system W-O up to 1700C (3090F) and isothermal sections for the ternary systems at 1400C (2550F) and 1700C (3090F) are presented. Because sealed sample containers were used during equilibration, data on the partial pressures of oxygen necessary for equilibrium and on the total pressures of the gas phase could not be obtained. Nevertheless, the positions of the oxygen isobars in the system W-O have been calculated from published thermodynamic data and extrapolations thereof, and generalities which are applicable to the ternary equilibria and which are governed by thermodynamics and the phase rule are stated. Similarly, the processes whereby changes in condensed phase assemblages occur as a function of oxidation of tungsten-metal alloys and mistures are illustrated with examples. Thhe ternary tungstates which are thermodynamically stable in the systems studied have been characterized as to x-ray diffraction pattern and melting temperature. Where possible, crystallographic information is also given. (Author).

Download or read book Physical Metallurgy of Tungsten and Tungsten Alloys written by Westinghouse Electric Corporation. Westinghouse Lamp Division and published by . This book was released on 1961 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A New Internal Oxidation Process for Strengthening Tungsten written by Robert Blickensderfer and published by . This book was released on 1971 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Properties of Vanadium base Tungsten and Chromium Alloys written by David R. Mathews and published by . This book was released on 1967 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physical and Mechanical Properties and Oxidation resistant Coatings for a Tungsten base Alloy written by W. G. Baxter and published by . This book was released on 1961 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On the Preparation of Metallic Tungsten and Its Alloys written by Herman Heald Kahlenberg and published by . This book was released on 1923 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tungsten Alloy Oxidation Behavior in Air and Steam written by and published by . This book was released on 1992 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents oxidation rates derived from posttest evaluations of a tungsten alloy initially tested at the INEL in air and steam between 600°C and 1200°C to obtain volatilization measurements which have been previously reported. Oxidation behavior of pure tungsten in air and environments containing water vapor is initially reviewed. The oxidation rates which we have found for the alloy in air and steam, expressed as recession rates (mm/s), are then compared with rates reported in the literature for pure tungsten. We have also used weight changes and mass balances involved in the oxidation and volatilization processes to predict oxidation reactions and estimate remnant oxide products and quantities of hydrogen formed. Relationships for the oxidation of the tungsten alloy in air and steam, and also, hydrogen generation in steam are given based upon data extracted both from our tests and from the literature. These are the relationships recommended for fusion safety analyses based upon the current available information. Finally, a comparison of hydrogen production rates show that the three primary plasma-facing component (PFC) materials ranked in increasing order are graphite, tungsten and beryllium. Each of these materials, however, have other safety or performance features which impact PFC selection.