Rev.Adv.Mater.Sci. (RAMS)
No 1, Vol. 28, 2011, pages 21-25

FABRICATION AND OXIDATION BEHAVIOR OF REACTIVELY HOT PRESSED TaB2-SiC CERAMICS

Seung Jun Lee, SeungSu Baek, Eul Son Kang, Seok-Min Yong and Do Kyung Kim

Abstract

The synthesis route, microstructure, mechanical properties and oxidation behavior of TaB2-SiC composite fabricated by reactive hot pressing using Ta/B4C/Si as precursors were investigated. The reaction sequence of TaB2-SiC composite was studied thorough series of heat treatment ranging from 1000 to 1900 úC in Ar. Based on the reaction sequence analysis, TaB2-SiC composite was reactively hot pressed at 1900 úC. Its elastic modulus, flexural strength, Vickers hardness and fracture toughness were 487 GPa, 542 MPa, 17.9 GPa and 3.63 MPam1/2, respectively. The oxidation behavior of the TaB2-SiC composites at 1500 úC in air exhibited passive oxidation with parabolic kinetic.

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