High temperature creep and oxidation resistant chromium silicide matrix alloy containing molybdenum

摘要

Cr3Si is alloyed with molybdenum which produces a two-phase microstructure of (Cr,Mo)3 Si and (Cr,Mo)5Si3. About 50 weight percent of molybdenum is present in the alloy. The alloy forms two protective oxides over a wide range of temperatures. Chromium and molybdenum oxide volatize under flowing air at high temperatures above 1200 DEG C. which facilitates the formation of SiO2 on the surface. Below 1200 DEG C. Cr2O3 is formed. The new alloy has excellent high temperature strength and creep properties.