Abstract
Platinum and its alloys are widely used in the glass-melting industry because of their high melting point, high resistance to oxidation and inertness with molten glass. Since they are usually used above 1273K, it is important to improve their mechanical properties at high temperatures above 1273K. For the further improvement of high temperature properties, it is essentially important to clarify the basic mechanical properties of platinum and its alloys at elevated temperatures. In this study, fatigue reliability at elevated temperature of platinum rhodium alloys were examined by the elucidation of fracture mechanism. Main results were follows ; (1) S-N characteristics of PtRh alloys were almost arranged in the straight line. (2) From the fractography using SEM, it was indicated that fatigue fracture mechanism was similar to the static destruction in the high stress side, on the other hand, that was effected by creep in the low stress side.
