Accession Number : AD0703881

Title :   KINETIC STUDIES OF THE ATTACK OF REFRACTORY MATERIALS BY FLUORINE ATOMS.

Descriptive Note : Final rept. 1 Feb 69-31 Jan 70,

Corporate Author : AEROCHEM RESEARCH LABS INC PRINCETON N J

Personal Author(s) : Rosner,Daniel E. ; Allendorf,H. Donald

Report Date : JAN 1970

Pagination or Media Count : 28

Abstract : The true kinetices of the attack of molybdenum and tungsten surfacs by both atomic and diatomic fluorine were studied using microwave charge--fast flow vacuum system techniques coupled with electrical resistance heating of the reacting specimens. Experimental results are reported herein covering the surface temperature range from 700K to their respective thresholds. Exploratory kinetic data is also included for the fluorination of titanium, graphic and boron. It is shown that despite the well known reactivity of molecular fluorine, dissociation produces a striking enhancement in the Mo- or W-atom removal probability at surface temperatures corresponding to appreciable steady state adatom populations. Interestingly enough, multiple local maxima appear in the Arrhenius diagram for the F-atom attack of Mo(s) and W(s)--these maxima presumably being attributable to the formation/desorption of distinct metal fluorides of widely discrepant stoichiometry and thermodynamic stability. (Author)

Descriptors :   (*REFRACTORY MATERIALS, *FLUORINATION), (*MOLYBDENUM, FLUORINATION), (*TUNGSTEN, FLUORINATION), REACTION KINETICS, FLUORINE, FLUORIDES, SURFACE PROPERTIES

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Ceramics, Refractories and Glass
      Liquid Rocket Propellants

Distribution Statement : APPROVED FOR PUBLIC RELEASE