POWDER-METALLURGICAL PRODUCTION OF PLATIN UM ALLOYS FOR HIGH-TEMPERATURE APPLICATIONS

Platinum metals are predestined for high-temperature application under strongly oxidizing and corrosive conditions. The possibilities of the powder-metallurgical production of semifinished goods and workpieces are analyzed. The alloy powders were produced by REP and inert gas ato mization. Semifinished goods can be produced by sintering or HIP proce sses. A new sealing technique with quartz glass containers was tested for the hot isostatic pressing process. The mechanical properties at h igh temperatures of specimens produced by powder-metallurgical and fus ion-metallurgical processes were compared. Significant differences wer e not found. The specimens produced by powder-metallurgical processes showed improved structural stability.