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Kinetics of the Reaction of UC 2 and Nitrogen from 1500° to 1700°C
Author(s) -
LINDEMER T. B.,
LEITNAKER J. M.,
ALLEN M. D.
Publication year - 1970
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1970.tb12676.x
Subject(s) - carbon fibers , nitrogen , diffusion , kinetics , chemistry , reaction rate , chemical kinetics , materials science , chemical engineering , analytical chemistry (journal) , thermodynamics , catalysis , chromatography , composite material , organic chemistry , composite number , physics , quantum mechanics , engineering
The kinetics of the reaction of UC 2 spheres with nitrogen was studied from 1500° to 1700°C. A metallographic method was used to determine the time‐dependent conversion of UC 2 to U(C,N) and free C. The conversion appeared to be controlled by the diffusion of solid carbon in solution to sites where it could precipitate as free carbon. These sites were the surface of the sphere and particles of free carbon that existed within the original UC 2 . An increased distribution of these internal sites decreased the distance for carbon diffusion and resulted in an increased rate of reaction. The UC 2 appeared to undergo a very rapid initial reaction that resulted in the uptake of 1 to 5 at.% nitrogen in the UC 2 at these temperatures.