KINETICS AND MECHANISM OF HIGH-TEMPERATURE OXIDATION OF RHENIUM IN THE RECRYSTALLIZED AND COLD-WORKED STATES
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The kinetics of oxidation of Re in the recrystallized and the cold-worked conditions were investigated at temperatures from 350 to 725 C. Oxidation isotherms were obtained by the method of continuous weighing for exposure times up to 50 hr. Hardening, by cold deformation from 21.9 to 53.0 Rockwell C, showed a definite accelerating effect on the formation and subsequent vaporization of Re oxides. At all temperatures, the rate of Re oxidation followed a linear relationship since there was no protective action from the constantly renewing film of ReO3 and Re2O7 oxides which melt at 160 and 296 C, respectively.