Minor element additions to single crystals for improved oxidatio

Details Minor element additions to single crystals for improved oxidatio Minor element additions to single crystals for improved oxidatio

1984-10-16

1989-01-31

Dean, R.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

148404, 428680, B32B 1501

Patent

active

048015130

ABSTRACT:
The additions of minor additions of hafnium and silicon and mixtures thereof to nickel base superalloy single crystal articles provide significantly improved oxidation resistance. The oxidation resistance is improved both for the case of uncoated articles and in the case where a protective coating such as for example, a MCrAlY coated is present. For example the addition of 0.1% hafnium is observed to improve the oxidation resistance by a factor of 4 at 2100.degree. F. and a similar addition improved the coating oxidation resistance by a factor of about 2.5 at 2150.degree. F.

REFERENCES:
patent: 4116723 (1978-09-01), Gell et al.

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