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Experimental Investigation and Thermodynamic Description of the Constitution of the Ternary System Cr‐Si‐C
Author(s) -
Du Yong,
Schuster Julius C.,
Perring Loic
Publication year - 2000
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.1151-2916.2000.tb01513.x
Subject(s) - liquidus , phase diagram , ternary operation , thermodynamics , eutectic system , ternary numeral system , differential thermal analysis , ternary compound , phase transition , materials science , phase (matter) , chemistry , crystallography , diffraction , microstructure , inorganic chemistry , physics , organic chemistry , computer science , optics , programming language
The constitution of the ternary system Cr‐Si‐C is investigated using differential thermal analysis and X‐ray diffractometry techniques. Eight invariant reaction temperatures involving the liquid phase are determined. The crystal structures and phase partitions observed for the subsolidus temperature region confirm literature data. Thermodynamic modeling, using a minimum of adjustable ternary parameters and assuming the binary high‐temperature phase, β‐Cr 5 Si 3 , to be stabilized toward lower temperatures as ternary D 8 8 ‐type Cr 5 Si 3 C x , generally reproduces the measured temperatures within 10 K. The calculated liquidus surface contains four ternary eutectics, three transition reactions, three degenerated reactions, and five (pseudobinary eutectics) maxima. The reaction scheme shows that no solid‐phase reactions occur in the Cr‐Si‐C system at >1000°C, except for the binary transition β‐Cr 5 Si 3 ↔α‐Cr 5 Si 3 . The activity diagram along the section Cr‐SiC at 1300°C, computed from the optimized data set, agrees with the observed diffusion path.