Combustion Synthesis/Dynamic Densification of a TiB2-SiC Composite

The Ti + 2B exothermic chemical reaction was used in combination with a high‐velocity forging step to produce dense TiB2‐(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 t...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1996-01, Vol.79 (1), p.177-182
Main Authors: Hoke, Darren A., Kim, Do Kyung, LaSalvia, Jerry C., Meyers, Marc A.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Miscellaneous
Technical ceramics
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Summary:The Ti + 2B exothermic chemical reaction was used in combination with a high‐velocity forging step to produce dense TiB2‐(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 TiB2 and SiC. The microstructures are composed of spheroidal TiB2 phase, a highly contiguous SiC binder phase, and an apparent eutectic between TiB2 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.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1996.tb07896.x