Oxidation behavior of V-Cr-Ti alloys in low-partial-pressure oxygen environments
- Argonne National Lab., IL (United States)
A test program is in progress at Argonne National Laboratory to evaluate the effect of pO{sub 2} in the exposure environment on oxygen uptake, scaling kinetics, and scale microstructure in V-Cr-Ti alloys. The data indicate that the oxidation process follows parabolic kinetics in all of the environments used in the present study. From the weight change data, parabolic rate constants were evaluated as a function of temperature and exposure environment. The temperature dependence of the parabolic rate constants was described by an Arrhenius relationship. Activation energy for the oxidation process was fairly constant in the oxygen pressure range of 1 {times} 10{sup {minus}6} to 1 {times} 10{sup {minus}1} torr for both the alloys. The activation energy for oxidation in air was significantly lower than in low-pO{sub 2} environments, and for oxidation in pure O{sub 2} at 760 torr was much lower than in low-pO{sub 2} environments. X-ray diffraction analysis of the specimens showed that VO{sub 2} was the dominant phase in low-pO{sub 2} environments, while V{sub 2}O{sub 5} was dominant in air and in pure oxygen at 76f0 torr.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- OSTI ID:
- 330614
- Report Number(s):
- DOE/ER-0313/24; ON: DE98007433; TRN: 99:005069
- Resource Relation:
- Other Information: PBD: Sep 1998; Related Information: Is Part Of Fusion materials semiannual progress report for the period ending June 30, 1998; Burn, G. [ed.] [comp.]; PB: 314 p.
- Country of Publication:
- United States
- Language:
- English
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