Low-Pressure, High-Temperature Oxidation of Tungsten

Perkins, R.A.; Crooks, D. D.

doi:10.1007/bf03378089

Cited by 12 publications

(10 citation statements)

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“…[6][7][8][9][10][11][12] Up to the present, however, no experimental evidence has been obtained as to the nature of the species formed. [6][7][8][9][10][11][12] Up to the present, however, no experimental evidence has been obtained as to the nature of the species formed.…”

Section: Introductionmentioning

confidence: 99%

Mass-Spectrometric Investigation of the Oxidation of Molybdenum and Tungsten

Berkowitz‐Mattuck

Büchler

Engelke

et al. 1963

The Journal of Chemical Physics

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The oxidation of molybdenum and tungsten was investigated mass spectrometrically at temperatures between 1500° and 2600°K and oxygen pressures between 10—4 and 10—2 Torr. The principal products of oxidation were found to be the gaseous dioxide and trioxide, MO2(g) and MO3(g) (M=Mo or W). The trioxide is the more important species at low temperatures; the dioxide is the dominant product at high temperatures. Small amounts of polymeric oxides, (MO3)2(g) and (MO3)3(g) were formed at the lowest temperatures and highest oxygen pressures. The gaseous oxidation products are not in equilibrium with a solid surface oxide.

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Section: Introductionmentioning

confidence: 99%

Mass-Spectrometric Investigation of the Oxidation of Molybdenum and Tungsten

Berkowitz‐Mattuck

Büchler

Engelke

et al. 1963

The Journal of Chemical Physics

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“…k,~ C,,~ = 9 Mo~/o~ [16] t, The rate of metal loss due to the formation of WO~ is, from Eq. [12], as before. Each equation is to be integrated over the limits 0 to tm determined by Eq.…”

Section: Equations [12] and [13] May Be Solved Simultaneously To Givementioning

confidence: 86%

“…Two recent investigations have reported a decrease in rate with temperature above 2000~ (11,12). Referring to Eq.…”

Section: Discussionmentioning

confidence: 99%

Oxidation of Refractory Metals as a Function of Pressure, Temperature, and Time: Tungsten in Oxygen

Ong

1962

J. Electrochem. Soc.

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By regarding the kinetics of oxidation of tungsten as occurring by the consecutive reactions: W + O~ --> WO~; WO~ + %O~ -> WO~(~); WO~(~) 1/n (WO~),~v~p) and by expressing the rate in terms of conventional chemical kinetic quantities, it is shown that the results of three investigations may be correlated in the temperature range 500~176 and pressure range 0.0013-20.8 atm of oxygen. A good approximate form for the rate of attack of metallic tungsten above 700~ is shown to have the form: Rate = d(m/A)/dt -~ 5.89 X 10 ~ exp (--12,170/T) P~/'~ mgw/cm ' hr, where T is expressed in ~ and P in atmospheres of oxygen.

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“…These hazards would all be reduced in severity because their potential occurrence is limited to phases 3,5,6 and 7 during vh ich full site control will be maintained. Nevertheless, analysis was conducted in the same manner as stated for the standards above.…”

Section: Hazards Summarymentioning

confidence: 99%

DESIGN DEFINITION AND SAFETY EVALUATION STUDY OF A COMPACT $sup 60$Co HEAT SOURCE IN SPACE. Final Report.

Ruêhle¹

1969

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Low-Pressure, High-Temperature Oxidation of Tungsten

Cited by 12 publications

References 0 publications

Mass-Spectrometric Investigation of the Oxidation of Molybdenum and Tungsten

Mass-Spectrometric Investigation of the Oxidation of Molybdenum and Tungsten

Oxidation of Refractory Metals as a Function of Pressure, Temperature, and Time: Tungsten in Oxygen

DESIGN DEFINITION AND SAFETY EVALUATION STUDY OF A COMPACT $sup 60$Co HEAT SOURCE IN SPACE. Final Report.

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