Title:
NICKEL BASE SUPERALLOY SINGLE CRYSTAL ARTICLE
Document Type and Number:
Japanese Patent JPS5861244
Kind Code:
A
Abstract:
The additions of minor amounts 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 coating is present. For example the addition of 0.1% hafnium is observed to improve the oxidation resistance by a factor of 4 at 1149 DEG C and a similar addition improved the coated oxidation resistance by a factor of about 2.5 at 1177 DEG C. The preferred single-crystal alloy composition lies within the range:-
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Inventors:
DEBUITSUDO NOERU DEYUURU
FUREDERITSUKU ARUBAATO SHIYUWA
FUREDERITSUKU ARUBAATO SHIYUWA
Application Number:
JP16154982A
Publication Date:
April 12, 1983
Filing Date:
September 14, 1982
Export Citation:
Assignee:
UNITED TECHNOLOGIES CORP
International Classes:
C22C19/05; C30B11/00; (IPC1-7): C22C19/05
Attorney, Agent or Firm:
Akashi Masatake