Radiotracer Study of Electrochemical Displacement on Metals

Simnad, Massoud T.; Spilners, Aija; Yang, Ling

doi:10.1080/00202967.1954.11869630

Cited by 3 publications

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“…Between 500 ~ and 1000~ several studies have been made (5)(6)(7). Simnad and Spilners (5) found the data could be fitted by the parabolic rate law at 500~ and by the linear rate law above 500~ Vaporization of MoO3 occurred at 650~ in 1 arm of oxygen.…”

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confidence: 99%

Oxidation of Molybdenum 550° to 1700°C

Gulbransen¹,

Andrew²,

Brassart³

1963

J. Electrochem. Soc.

186

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Weight change and oxygen consumption measurements were used to study the oxidation of molybdenum from 550 ~ to 1704~ for pressures of 5 to 76 Torr. For temperatures of 550~176 two processes occurred simultaneously, oxide scale formation and molybdenum trioxide volatility. Above 800~ at pressures up to 76 Tort molybdenum trioxide volatilized as fast as it formed. At 900~ and 76 Torr using 1.2 cm 2 samples the primary chemical reaction gave a rate of about 10 is at. molybdenum/cm2/sec. Above this temperature for 1.2 cm 2 specimens the reaction was limited by gaseous diffusion of oxygen. Little change was found in the rate of oxidation to 1615~ Pressure had only a small effect on the rate of reaction for these reaction conditions. However, in the chemically controlled region pressure had an important effect on the rate of oxidation. To extend the temperature region where the primary chemical reaction was rate controlling, samples of small area were used. A sample having a total area of 0.12 cm 2 gave a reaction rate of 8 x 10 is at./cm2/sec at 1410~ For these very fast reactions, appreciable temperature rises occurred, and the actual sample temperature had to be estimated. A log K vs. 1/T plot of the primary chemical

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