Accession Number:

AD0283133

Title:

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

Descriptive Note:

Corporate Author:

UTAH UNIV SALT LAKE CITY

Personal Author(s):

Report Date:

1962-08-01

Pagination or Media Count:

1.0

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

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE