“Oxidation of Niobium in the Temperature Range 350°–750°C”[J. Electrochem. Soc., 106, 495 (1960)]

Aylmore, D. W.; Gregg, S. J.; Jepson, W. B.

doi:10.1149/1.2427544

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1973

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“…In pure columbium, when the oxidation rate .nstant i ; plotted versus temperature, it has been found that for oxygen pressures above 10 torr the rate goes through a maximum around 1300 F, decreases to about 1500 F, after which it again increases with temperature. [11][12][13] In a study of that rate anomaly in binary Cb-Ta alloys 14 it was found that the oxidation rate maximum is shifted upward in temperature with increasing tantalum additions. The rate maximum was shifted to 1800 F by 30 at.% Ta with further additions having little effect on the temperature of the rate maximum.…”

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confidence: 99%

Contamination Hardening of SU-31 and FS-85 Columbium Alloys

Herring¹

1973

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A study has been made of the contamination hardening of SU-31 and FS-85 columbium alloys which results when samples are exposed in air at temperatures of 1400 to 2600 F. Diffusion coefficients for the principal contaminant, calculated from the hardening profiles, are in good agreement with data previously reported for diffusion of oxygen in pure columbium. From that agreement it has been concluded that the hardening in the alloys is principally due to the absorption and diffusion of oxygen from the air. Activation energies measured were 22.5 kcal/mol for SU-31 and 20.3 kcal/mol for FS-85. Based on the measurements of this study, SU-31 has a higher resistance to contamination hardening than FS-85 by about a factor of two.

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Section: :'mentioning

confidence: 99%

Contamination Hardening of SU-31 and FS-85 Columbium Alloys

Herring¹

1973

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“Oxidation of Niobium in the Temperature Range 350°–750°C”[J. Electrochem. Soc., 106, 495 (1960)]

Abstract: not Available.

Cited by 1 publication

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Contamination Hardening of SU-31 and FS-85 Columbium Alloys

Contamination Hardening of SU-31 and FS-85 Columbium Alloys

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