RESEARCH AND DEVELOPMENT PROGRAM OF THERMIONIC CONVERSION OF HEAT TO ELECTRICITY. VOLUME 1

Abstract

The diffusion rates of uranium through tungsten when the tungsten is used to encapsulate urania were determined in the temperature range between 1800 and 2000C. Similarly the diffusion rates of uranium through molybdenum when the molybdenum is used to encapsulate urania were determined in the temperature range between 1600 and 1750C. It was generally concluded that the steady state diffusion rates are of such magnitude that uranium diffusion through both tungsten and molybdenum is not likely to affect their performance as thermionic emitters. The activation energy and diffusivities for the diffusion of oxygen through polycrystalline molybdenum were determined in the temperature range 1500 to 1800C. A mass spectrometric and thermogravimetric study of the equilibrium interaction between alumina and niobium between 1500 and 1900C was also conducted.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1968
Accession Number
AD0674882

Entities

Organizations

  • General Electric

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Body Weight
  • Chemical Analysis
  • Energy
  • Equations
  • High Temperature
  • Mass Spectrometers
  • Mass Spectrometry
  • Materials
  • Measurement
  • Metallurgy
  • Oxides
  • Partial Pressure
  • Powder Metallurgy
  • Refractory Metals
  • Temperature Gradients
  • X Rays

Fields of Study

  • Materials science

Readers

  • Combustion science or combustion engineering.
  • Surface Engineering/Surface Coating Technology.