Oxidation Performance of Platinum-Clad Mo-47Re Alloy

The alloy Mo-47Re has favorable mechanical properties at temperatures above 1400 ffi C, but it undergoes severe oxidation when used in air with no protective coating. To shield the alloy from oxidation, platinum cladding has been evaluated. The unprotected alloy undergoes catastrophic oxidation under static and dynamic oxidation conditions. The platinum cladding provides good protection from static and dynamic oxidation for moderate times at 1260 ffi C. Samples tested for longer times under static oxidation conditions experienced severe oxidation. The data suggest that oxidation results from the transport of oxygen through the grain boundaries and through the pinhole defects of the platinum cladding. Introduction Molybdenum-based alloys have the potential for meeting the materials requirements of many applications requiring strength values of the order of 140 MPa at temperatures as high as 1300 ffi C. The addition of rhenium to molybdenum provides greater ductility and a lower d..