Accession Number : AD0450679


Title :   MASS SPECTROMETRIC STUDY OF THE OXIDATION OF TUNGSTEN,


Corporate Author : UNION CARBIDE RESEARCH INST TARRYTOWN NY


Personal Author(s) : Schissel, P O ; Trulson, O C


Report Date : Oct 1964


Pagination or Media Count : 22


Abstract : A mass spectrometer was used to study the kinetics of the oxygen-tungsten reaction over the temperature range 1400 to 3150 K at oxygen pressures as high as 0.0002 torr. The main products of chemical reaction are identified as W3O9, W2O6, WO3, and WO2; their intensities are given as a function of surface temperature and oxygen pressure. At high surface temperatures, atomic oxygen is observed in an abundance comparable to the impingement rate of molecular oxygen on the surface. These observations lead to a reaction mechanism involving two types of oxygen on the surface, the first tightly bound with a desorption energy near 144 kcal/mole, the second more loosely bound with a desorption energy near 114 kcal/mole. A detailed kinetic model is proposed to account for the observations. (Author)


Descriptors :   OXIDATION , TUNGSTEN , OXIDES , MASS SPECTROSCOPY , TUNGSTEN COMPOUNDS , OXIDES , CHEMICAL REACTIONS , SURFACES , HYPOBARIC CONDITIONS , SCIENTIFIC RESEARCH , IONS , SURFACE TEMPERATURE , ADSORPTION


Distribution Statement : APPROVED FOR PUBLIC RELEASE