Abstract:The creep behaviors of Pt-RE alloys have been studied at 1200℃ and 1400℃.The results show that a small amount of RE elements improves the creep behaviors of platinum greatly.The creep behaviors of PtGd0.5, PtLa0.5 and PtLa0.3 Gd0.2,are best among all the alloys studied.As far as the creep behaviors are concerned, the traditional heat-resistance alloy PtGd10 can be replaced by PtGd0.5.Particularly,the properities of PtGd0.5 are near to those of PtRb10.For most of the Pt-RE alloys,long-time,static,super high-temperature treatment in air is of no advantage to the creep rupture life.The mechanisms of the effects of rare-earths on high-temperature creep properties of platinum are discussed.

Key words: Pt-RE alloys; high-temperature; creep behaviors