Accession Number:

AD0603002

Title:

Diffusion Coating Process for Columbium Base Alloys

Descriptive Note:

Technical documentary rept. Feb 1961-Feb 1962

Corporate Author:

CHANCE VOUGHT CORP DALLAS TX

Report Date:

1964-06-01

Pagination or Media Count:

126.0

Abstract:

A study was conducted to improve and optimize coatings for columbium alloys, protective in air to 2600 deg F for at least 10 hours. Process variables of two different silicide base coating systems Si-Cr-Al and Si-Cr-B applied by a two-step pack cementation process were optimized by statistical methods. Coatings were evaluated on D-31, C-103, Cb-1Zr FS-80, and FS-82 columbium alloys. Oxidation resistance testing included furnace testing in moving air, sustained load thermal cycling, propane torch and ram-jet tests. Tensile strength and bend properties of uncoated and coated alloys were evaluated at room and elevated temperatures. An analytical evaluation of these systems was conducted to characterize the coating components. In addition, oxidation tests in the range 1000 to 2000 deg F were conducted to determine di-silicide pest effects on the two systems. The Si-Cr-B system was unaffected by this phenomenon.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Metallurgy and Metallography
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE