Fracture Behavior of Solidified TiC-TiB₂ Ceramic Prepared by Combustion Synthesis in Ultra-High Gravity Field

Abstract:

A series of TiC-TiB₂ ceramics were prepared by combustion synthesis in ultra-high gravity field, the microstructure, fracture behavior and toughening mechanism of the composite ceramic are discussed. The maximum fracture toughness of 13.1 MPa · m^0.5 is achieved in TiC-66.7%TiB_2, very close to the values (10~15 MPa · m^0.5) of fiber-reinforced ceramic composite, contributed from the intensive coupled toughening mechanisms of crack deflection, frictionally crack-bridging and pull out by a large number of fine TiB₂ platelets and ductile phase toughing caused by a few Cr-Al metallic phases.

• Periodical: Applied Mechanics and Materials (Volumes 341-342)
• Pages: 144-148
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.341-342.144
• Online since: July 2013
• Authors: Hao Zhang, Zhong Min Zhao, Long Zhang
• Keywords: Crack Propagation, Fracture Behavior, Self-Toughening, TiC-TiB₂ Composite

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