Oxidation of Mo-Re at reduced oxygen pressures

Astronomy and Astrophysics – Astronomy

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Spaceborne And Space Research Instruments, Apparatus, And Components, Direct Energy Conversion And Storage, Other Topics In Instruments, Apparatus, And Components Common To Several Branches Of Physics And Astronomy

Scientific paper

Rhenium generally improves the properties of molybdenum, and, therefore, there is interest in use of Mo-Re alloys in space system applications. Both Mo and Re have relatively low solubilities for oxygen but readily form oxide scales when exposed to oxidizing environments above ~625 K. Studies are being conducted on Mo-41 Re to determine the rate of oxidation, type of scale formation, and effects on mechanical properties as a function of temperature and partial pressure of oxygen. Thus far, weight gains associated with formation of MoO2 have been found for PO2<10-3 Pa(10-5 torr) in vacuum, and weight losses associated with evaporation of MoO3 at 10-2 Pa. However, no significant changes in tensile properties were measured. .

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