Abstract
High temperature oxidation of Pt(Al) solid solution and Pt(Al) with was investigated in order to prepare a Pt wire with an external film for a hot‐wire technique to measure thermal conductivities of fused metals. At temperatures from 1373 to 1673 K in air, Pt‐4.6 mol % Al (solid solution) indicated internal oxidation. Continuous scales developed on Pt‐9.4 mol % Al (solid solution) and Pt‐13.1 mol % (the two phase alloy). External scales formed on those alloys after high temperature oxidation under low oxygen pressure of gas mixture. The oxidation rate increased with increasing Al content and oxygen partial pressure. The Al concentration at the transition from internal to external oxidation was determined by using oxygen permeability through Pt‐Al alloys calculated from internal oxidation kinetics. © 2000 The Electrochemical Society. All rights reserved.
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