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Phase Equilibria in the System Tungsten—Carbon
Author(s) -
SARA R. V.
Publication year - 1965
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.1151-2916.1965.tb14731.x
Subject(s) - eutectic system , solidus , tungsten , materials science , atmospheric temperature range , stoichiometry , analytical chemistry (journal) , phase (matter) , quenching (fluorescence) , carbon fibers , homogeneity (statistics) , differential thermal analysis , metallurgy , thermodynamics , chemistry , composite material , microstructure , diffraction , optics , physics , statistics , organic chemistry , alloy , chromatography , mathematics , composite number , fluorescence
Quenching from high temperatures, supplemented by differential thermal analysis, has shown that the tungsten‐carbon binary is characterized by eutectic temperatures of 2710° and 2760°C between W and W 2 C, and between W 2 C and a new high‐temperature phase (β‐WC), respectively. Carbon solubility in excess of stoichiometric W 2 C is evident only at 2525°C, the eutectoid temperature between W 2 C and WC. W 2.35 C melts congruently at 2795°C. A new fee phase (β‐WC), stable only above 2525°, has been discovered between W 2 C and α‐WC. The cubic phase is formed by a periteci reaction at approximately 2785°C and has a broad homogeneity range ear the solidus. The phase, α‐WC, decomposes into β‐WC and C at 2755°C, approximately 25°C below the melting temperature.