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Combustion Synthesis/Dynamic Densification of a TiB 2 ‐SiC Composite
Author(s) -
Hoke Darren A.,
Kim Do Kyung,
LaSalvia Jerry C.,
Meyers Marc A.
Publication year - 1996
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.1151-2916.1996.tb07896.x
Subject(s) - materials science , exothermic reaction , eutectic system , microstructure , combustion , composite number , phase (matter) , silicon carbide , composite material , fiber , metallurgy , chemical engineering , thermodynamics , chemistry , physics , organic chemistry , engineering
The Ti + 2B exothermic chemical reaction was used in combination with a high‐velocity forging step to produce dense TiB 2 ‐(20 vol%)SiC composites. Densities in excess of 96 % of the theoretical were achieved for both SiC particulate and fiber additions. X‐ray diffractometry revealed the products of the reaction to be TiB 2 and SiC. The microstructures are composed of spheroidal TiB 2 phase, a highly contiguous SiC binder phase, and an apparent eutectic between TiB 2 and SiC located at regions of preexisting SiC additions. These microstructural features suggest that SiC underwent a peritectic phase transformation. Thermodynamic analysis predicts that at least 41 vol% SiC addition is needed to prevent the loss of the starting morphologies by the peritectic reaction.