THE DEHYDRATION OF GYPSUM. PART II. THE OXIDATION KINETICS OF TANTALUM IN CARBON DIOXIDE

Abstract

The dehydration of both polycrystalline and single crystal samples of gypsum was studied in the temperature range 99 to 142 C by means of visual observation, infrared spectroscopy, X-ray diffraction, and thermogravimetric techniques. Samples of Ta were oxidized in CO2AT VARIOUS PARTIAL PRESSURES IN THE TEMPERATURE RANGE 700 TO 950 C and in CO2-CO mixtures in the range 760 to 820 C. The reaction involved linear oxidation which was associated with the formation of a nonprotective layer of Ta2O5. Below about 720 C, there was a change in the rate-determining mechanism, and above 840 C the linear reaction was preceded by a region of nonlinear oxidation. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1962
Accession Number
AD0283133

Entities

People

  • Kenneth J. Richards

Organizations

  • University of Utah

Tags

DTIC Thesaurus Topics

  • Carbon Dioxide
  • Crystals
  • Dehydration
  • Diffraction
  • Infrared Spectroscopy
  • Oxidation
  • Partial Pressure
  • Single Crystals
  • Spectroscopy
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Electrochemical Engineering/ Fuel Cell Technologies
  • Surface Engineering/Surface Coating Technology.
  • Thin Film Deposition Science.