Oxidation of zirconium and zirconium alloys /
| Other Authors: | , , , |
|---|---|
| Format: | Government Document Book |
| Language: | English |
| Published: |
Lemont, III :
Argonne National Laboratory,
1959.
|
| Series: | ANL (Series) ;
6046. AEC research and development report. |
| Subjects: |
| Abstract: | Zirconium oxidation was investigated in the temperature range 400 to 900 deg C at oxygen pressures of 50, 200, and 800 mm. The reaction rate of massive (parallelepiped) samples was best expressed by the cubic rate law. At an oxygen pressure of 200 mm the activation energy was calculated to be 42.7 kcal per mole, and the cubic rate constant in (mu g per sq cm) per minute. The oxidation rate was found to be relatively insensitive to various types of surface preparations in the temperature range 400 to 700 deg C. No dependence of reaction rate on oxygen pressure was observed. The cubic rate law also was obeyed by foil specimens at 700 deg C; however, the rate constants were slightly larger than values obtained from parallelepiped samples. The alloys were grouped according to four types of oxidation behavior. Two groups consisted of alloys which oxidized according to the cubic rate law (Group I) or parabolic rate law (Group II) and did not exhibit breakaway phenomena. The other groups were alloys which initially oxidized according to the cubic rate law (Group III) or parabolic rate law (Group IV) but later exhibited breakaway oxidation phenomena. |
|---|---|
| Physical Description: | 42 pages : illustrations ; 28 cm. |
| Bibliography: | Includes bibliography references. |