Accession Number:

AD0434441

Title:

STUDY OF DUCTILE COATINGS FOR THE OXIDATION PROTECTION OF COLUMBIUM AND MOLYBDENUM ALLOYS

Descriptive Note:

Bimonthly progress rept. no. 4, 1 Jan-29 Feb 1964

Corporate Author:

METALS AND CONTROLS INC ATTLEBORO MA

Personal Author(s):

Report Date:

1964-03-31

Pagination or Media Count:

41.0

Abstract:

Oxidation loss rates for platinum and platinum rhodium alloy samples were determined to be 1.98 and 2.40 microinches per hour, respectively, at 2550 F in an air flow of 480 ipm. Tests on coating-base metal composites showed coated TZM and FS-85 to be attacked differently. Molybdenum from the TZM was found to diffuse through the coating and be removed at its surface as a volatile oxide. Oxygen penetrated the coatings on the FS-85 samples in a discontinuous manner, causing blisters of oxide to be formed which eventually burst through the coating. Details of the diffusion-oxidation mechanisms remain to be determined.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE