Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1975-12-08
1978-03-14
Dean, R.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75122, 75134F, 148 2, 148 115N, 148 32, C22C 1907
Patent
active
040789225
ABSTRACT:
Cobalt base alloys for use at elevated temperatures are disclosed that possess excellent resistance to oxidation/corrosion at elevated temperatures in combination with mechanical properties which exceed those of similar alloys currently in use. The resistance to oxidation/corrosion is afforded by a particular combination of aluminum and chromium which act to form a protective alumina layer and a synergistic combination of hafnium and yttrium which act to promote adherence of the alumina. Refractory metal additions are utilized to improve the mechanical properties. The alloys of the invention are suited for use in gas turbine engines as well as industrial applications such as furnaces and chemical process apparatus.
REFERENCES:
patent: 3399058 (1968-08-01), Roush
patent: 3549356 (1970-12-01), Sims et al.
Felten Edward Joseph
Gell Maurice Louis
Hirakis Emanuel Collins
Magyar Stephen Thomas
Dean R.
Sohl Charles E.
United Technologies Corporation
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