Diffusion Coating Process for Columbium Base Alloys

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.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1964
Accession Number
AD0603002

Entities

People

  • Aleck B. Featherston
  • Brennan A. Forcht
  • Gordon W. Bourland
  • Kent P. O'kelly
  • William L. Aves Jr.

Organizations

  • Vought

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Chemistry
  • Coatings
  • Edges
  • Elements
  • Leading Edges
  • Materials
  • Materials Engineering
  • Materials Laboratories
  • Metal Oxides
  • Metallic Nanoparticles
  • Oxidation Resistance
  • Pack Cementation
  • Refractory Metals
  • Statistical Analysis
  • Tensile Strength
  • Test And Evaluation
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Electrical Engineering
  • Metallurgy
  • Surface Coatings Technology.