Accession Number : AD0878331

Title :   Research to Determine the Effects of Surface Catalycity on Materials Behavior in Dissociated Gas Streams-ATJ-Graphite.

Descriptive Note : Final rept. 15 Oct 68-31 Jan 70,

Corporate Author : LITTLE (ARTHUR D) INC CAMBRIDGE MA

Personal Author(s) : Berkowitz-Mattuck, Joan B.

Report Date : 28 FEB 1970

Pagination or Media Count : 60

Abstract : The reactions of partially dissociated oxygen with heated ATJ graphite surfaces have been investigated at temperatures of 1600-2800K and oxygen atom partial pressures of 0.007 to 0.074 torr. Measurements of total oxygen atom decay as a result of both chemical reaction and catalytic recombination were carried out by the NO-NO2 light intensity method in a fast flow system. Weight change measurements were made to separate the total atom loss results into its two components. Mass spectrometric experiments were carried out over the temperature range 400-1200K to determine product distribution as a function of oxygen molecule dissociation. The rate of net atom loss was found to be linear with time at a given partial pressure, and approximately first order in pressure. The net atom loss rate shows a maximum in the temperature interval investigated, the maximum shifting to higher temperatures with decreasing oxygen atom pressure. (Author)

Descriptors :   *OXIDATION), (*GRAPHITE, (*HEAT SHIELDS, GRAPHITE), OXYGEN, REACTION KINETICS, MASS SPECTROSCOPY, RECOMBINATION REACTIONS, SURFACES.

Subject Categories : Ceramics, Refractories and Glass
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE