High temperature creep and oxidation resistant chromium silicide

Details High temperature creep and oxidation resistant chromium silicide High temperature creep and oxidation resistant chromium silicide

1993-05-26

1994-07-19

Dean, Richard O.

Metal treatment

Stock

Chromium, molybdenum, or tungsten base

148442, 420428, 420429, 420578, 420588, 75230, 75245, C22C 2918

Patent

active

053305906

ABSTRACT:
Cr.sub.3 Si is alloyed with molybdenum which produces a two-phase microstructure of (Cr,Mo).sub.3 Si and (Cr,Mo).sub.5 Si.sub.3. 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.degree. C. which facilitates the formation of SiO.sub.2 on the surface. Below 1200.degree. C. Cr.sub.2 O.sub.3 is formed. The new alloy has excellent high temperature strength and creep properties.

REFERENCES:
patent: 1774849 (1930-09-01), Schroter
patent: 4696703 (1987-09-01), Henderson et al.
patent: 4728493 (1988-03-01), Vreeland
patent: 4997623 (1991-03-01), Brill
patent: 5021215 (1991-06-01), Sawaragi et al.
patent: 5063023 (1991-11-01), Sridhar

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