Oxidation Of Tungsten
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Oxidation Of Tungsten
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Author : Vincent David Barth
language : en
Publisher:
Release Date : 1961
Oxidation Of Tungsten written by Vincent David Barth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Tungsten categories.
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).
Oxidation Of Tungsten And Tungsten Based Alloys
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Author : Westinghouse Electric Corporation. Research Laboratories
language : en
Publisher:
Release Date : 1960
Oxidation Of Tungsten And Tungsten Based Alloys written by Westinghouse Electric Corporation. Research Laboratories and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with Metals categories.
High Temperature Oxidation Protection Of Tungsten
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Author :
language : en
Publisher:
Release Date : 1969
High Temperature Oxidation Protection Of Tungsten written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Metals at high temperatures categories.
Effect Of Oxygen On Mechanical Properties Of Tungsten
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Author : Joseph R. Stephens
language : en
Publisher:
Release Date : 1963
Effect Of Oxygen On Mechanical Properties Of Tungsten written by Joseph R. Stephens and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Tungsten categories.
The effect of oxygen on the mechanical properties of commercial polycrystalline tungsten and zone-refined single-crystal tungsten was evaluated by means of tensile tests of oxygen-doped specimens in the ductile-to-brittle transition temperature range. The effect of oxygen as a surface oxide that might be encountered in normal working and forming operations was evaluated by means of a three-point loading bend test at room temperature. Oxygen doping of the polycrystalline and single-crystal tensile specimens was accomplished by equilibrating the specimen and tungsten oxide powder in a sealed tungsten capsule at high temperatures. A desired oxygen concentration could be achieved by varying the time of doping in the temperature range of 3000 to 3600 F. Results showed that the commercial recrystallized rods containing 4 parts per million (ppm) oxygen had a ductile-to-brittle transition temperature (based on 50-percent reduction in area) of 4500 F. Increasing the oxygen concentration to 10, 30, and 50 ppm increased the transition temperature to 6600, 840, and 1020 F, respectively. The oxygen additions also produced a progressive lowering of the ultimate tensile strength. The mechanism for the effect of oxygen on the transition temperature and ultimate tensile strength is believed to be that of segregation of the oxygen atoms at the grain boundaries. The oxygen additions also caused a progressive lowering of the yield strength, which is believed to result from the interaction of oxygen with carbon atoms or other impurity atoms present in the tungsten lattice.
Oxidation Of Titanium Carbide Base Ceramals Containing Molybdenum Tungsten And Cobalt
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Author : M. J. Whitman
language : en
Publisher:
Release Date : 1949
Oxidation Of Titanium Carbide Base Ceramals Containing Molybdenum Tungsten And Cobalt written by M. J. Whitman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1949 with Ceramic materials categories.
The cobalt ceramals were considered better than the tungsten caramals in over-all oxidation resistance and the molybdenum ceramals were inferior to both the cobalt and tungsten ceramals.
Properties Of Tungsten Of Interest In The Field Of Nuclear Power
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Author :
language : en
Publisher:
Release Date : 1962
Properties Of Tungsten Of Interest In The Field Of Nuclear Power written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Tungsten categories.
Review Of Recent Developments In The Technology Of Tungsten
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Author : Vincent David Barth
language : en
Publisher:
Release Date : 1961
Review Of Recent Developments In The Technology Of Tungsten written by Vincent David Barth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Tungsten categories.
Some Reactions Of Tungsten Vi Oxide And Molybdenum Vi Oxide With Liquid Sulfur
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Author : John W. Goodrum
language : en
Publisher:
Release Date : 1970
Some Reactions Of Tungsten Vi Oxide And Molybdenum Vi Oxide With Liquid Sulfur written by John W. Goodrum and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Chemical reactions categories.
In situ generation of species for crystal growth in solution is a relatively undeveloped, but promising technique for preparation of solid state material. In this work a solvent, liquid sulfur, generates species in solution by chemical reduction at high temperatures. Evaluation of this high temperature reduction agent included measurements of qualitative and kinetic parameters for the reactions molybdic oxide - sulfur and tungstic oxide - sulfur as a function of temperature, time, and atmosphere. Temperature effects on reduction rate over the range 125 to 400C were markedly non-linear. Reduction products isolated include Mo(IV) oxide at 250C; Mo(IV) sulfide at 400C; W(IV) sulfide at 400C. The oxidation product detected whenever reduced species were found was sulfur(IV) oxide. Additional evidence of species WO(x)S(y) and polymeric sulfur was found. Results of this study indicate that liquid sulfur can serve as a straightforward reducing agent at high temperatures. The rate or extent of such reduction is easily controlled by varying thermal conditions or duration of reaction, and the products of such reductions may be readily isolated by solution techniques which remove unreacted sulfur.
The Chemistry Of Chromium Molybdenum And Tungsten
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Author : Carl L. Rollinson
language : en
Publisher: Elsevier
Release Date : 2015-08-11
The Chemistry Of Chromium Molybdenum And Tungsten written by Carl L. Rollinson and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-08-11 with Science categories.
The Chemistry of Chromium, Molybdenum and Tungsten deals with the chemistry of chromium, molybdenum, and tungsten. The discovery and history, occurrence and distribution, and production of all three elements are discussed, along with their industrial uses, preparation, and allotropes; nuclear, physical, and chemical properties; biological activities; and analytical chemistry. Organized into three sections, this volume begins with an overview of the history, occurrence and distribution, and production of chromium, molybdenum, and tungsten, as well as their industrial uses, preparation, and allotropes; nuclear, physical, and chemical properties; biological activities; and analytical chemistry. The intermetallic phases in binary alloys of all three elements are also considered, along with their oxidation states and respective compounds including compounds with non-metallic elements; compounds of ?-acceptor ligands; organometallic complexes; and peroxy compounds such as peroxychromates, tetraperoxy molybdates, and peroxy tungstates. This book will be of interest to inorganic chemists as well as students and researchers in the field of inorganic chemistry.
Oxidation Of Tungsten And Tungsten Based Alloys
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Author : E. A. Gulbransen
language : en
Publisher:
Release Date : 1962
Oxidation Of Tungsten And Tungsten Based Alloys written by E. A. Gulbransen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Metals categories.