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Chemical Diffusion and Phase Equilibria in the Vanadium‐Carbon System Above 1900°C
Author(s) -
ADELSBERG L. M.,
CADOFF L. H.
Publication year - 1968
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.1151-2916.1968.tb11875.x
Subject(s) - vanadium , eutectic system , diffusion , graphite , carbon fibers , thermal diffusivity , chemistry , analytical chemistry (journal) , phase (matter) , phase diagram , liquid phase , thermodynamics , materials science , crystallography , inorganic chemistry , microstructure , chromatography , physics , composite material , organic chemistry , composite number
Direct reaction of liquid vanadium and graphite resulted in the carbon‐diffusion‐controlled formation of V 2 C (below approximately 2160°C) and VC scales below 2670° C. Parabolic growth behavior for both phases was observed; the growth constant for VC was expressible as K, V”= 2.13 exp ‐ (67,000/RT) cm2/sec. The growth rate of V 2 C was lower at 2000” than at 1900°C. The chemical diffusivity of carbon in VC above 2160°C was estimated to be Dcv”= 0.26 exp ‐ (58,300/RT) cm2/sec. Several contributions to the vanadium‐carbon binary diagram are presented. The VC + C = liquid eutectic point was determined to be at C/V = 1.15 ± 0.05 at 2670°± 50°C.