Oxidation of Tungsten
Oxidation of Tungsten

Author: Vincent David Barth

Publisher:

Published: 1961

Total Pages: 192

ISBN-13:

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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 Resistant High Temperature Protective Coatings for Tungsten
Oxidation Resistant High Temperature Protective Coatings for Tungsten

Author: H. J. Nolting

Publisher:

Published: 1963

Total Pages: 156

ISBN-13:

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Three coating systems were developed that protected 60 mil tungsten sheet from oxidation in air at elevated temperatures. These composites, applied by the vacuum pack process, were; silicon-tungsten; titanium zirconium silicon tungsten, and; titanium zirconium-boron silicon-tungsten. A laboratory scale process for application of each coating to tungsten sheet was developed and optimized. Oxidation characteristics of the coated systems in air under various static and cyclic conditions were determined from 1600° to 3650° F with several hours protection being achieved under cyclic conditions at 3550° F. Tensile tests were conducted on two of the three systems at regular temperature increments from room temperature to 3300° F under various environmental conditions. Stress oxidation, thermal shock, and hot gas erosion tests were also con ducted on the diffraction patterns were determined on the silicon-tungsten and titanium zirconium silicon-tungsten composites in the coated and exposed conditions. (Author).