IMPROVED OXIDATION RESISTANCE OF MOLYBDENUM BY ALLOYING WITH HAFNIUM.

Abstract

Preferential oxidation of a thermodynamically active metal component in a binary molybdenum base alloy has been used sucessfully to study the kinetics and mechanism of oxidation of that alloy and to determine the diffusion coefficient of the active component in the alloy. The system chosen was molybdenum-hafnium. Diffusion coefficients for hafnium in molybdenum were independently predicted by suitable modification of the equation for self diffusion developed by Sherby and Simnad, and combining this equation with the Dushman - Langmuir equation. The method allows for calculation of the activation energy E, and the frequency factor A, from existing data for the diffusion of zirconium in tungsten. The diffusion coefficients which were calculated by this method checked the ones which were obtained by the selective oxidation method quite well. (Author)

Document Details

Document Type
Technical Report
Publication Date
Sep 03, 1963
Accession Number
AD0421589

Entities

Organizations

  • Colorado School of Mines

Tags

DTIC Thesaurus Topics

  • Coefficients
  • Diffusion
  • Diffusion Coefficient
  • Equations
  • Heat Of Activation
  • Metals
  • Molybdenum
  • Oxidation
  • Oxidation Resistance
  • Resistance

Readers

  • Materials Science and Engineering.
  • Surface Engineering/Surface Coating Technology.
  • Thin Film Deposition Science.