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- W2093886240 abstract "Examination of the processes occurring during the oxidation of Zr-1% Al, Zr-3% Al, and Zr-1.5% Al-0.5% Mo alloys has shown that in steam rapid oxidation occurs predominantly around the Zr{sub 3}Al particles, which at low temperatures appear to be relatively unattacked. The unoxidised particles become incorporated in the oxide, and become fully oxidised as the film thickens. This rapid localised oxidation is preceded by a short period of uniform film growth, during which the oxide film thickness does not exceed 200A. Thus the high oxidation rates can probably be ascribed to aluminum in solution in the zirconium matrix, although its precise mode of operation has not been determined. Once the soluubility limit of aluminum is exceeded, the size, distribution and number of intermetallic particles affects the oxidation rate merely by altering the distribution of regions of metal giving high oxidation rates. The controlling process during the early stages of oxidation is electron transport and not ionic transport. Thus, the aluminum in the oxide film is presumably increasing the ionic conductivity more than the electronic. The oxidation rates in atmospheric pressure steam are very high and their irregular temperature dependence suggests that the oxidation rate will be pressure dependent. This wasmore » confirmed, in part, by a comparison with oxidation in moist air. It was found that the rate of development of white oxide around inter-metallic particles was considerably reduced by the decrease in the partial pressure of H{sub 2}O; the incubation period was not much different, however. (auth)« less" @default.
- W2093886240 created "2016-06-24" @default.
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- W2093886240 date "1967-10-15" @default.
- W2093886240 modified "2023-09-26" @default.
- W2093886240 title "Oxidation of zirconium-aluminum alloys" @default.
- W2093886240 hasPublicationYear "1967" @default.
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