Accession Number:

ADA063570

Title:

Coatings for Directionally Solidified Gamma Prime-Gamma Plus Alpha Eutectics.

Descriptive Note:

Final rept. 1 Aug 77-31 Jul 78,

Corporate Author:

UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CONN

Personal Author(s):

Report Date:

1978-10-22

Pagination or Media Count:

50.0

Abstract:

The oxidationcorrosion characteristics of directionally solidified eutectics including gamma prime-gamma plus alpha alloys are sufficiently well documented to state that oxidation and hot corrosion resistant coatings will be required over a wide range of temperatures. The specific problem with respect to coating the gammagamma-alpha family of alloys is not simply coating chemistry. Rather the major obstacle here involves mating the anisotropic thermal expansion behavior of the substrate with that of the coating so that the latter will not crack under thermal cycling. The approach taken in this study includes minimizing the differences in thermal expansion between the protective coating and the eutectic substrate by selective alloying of the coating and increasing the strain capacity of the coating.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE