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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.120  No.1400 (April) (2012)  >  pp.143-149

Journal of the Ceramic Society of Japan
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Mechanical and oxidation behavior of spark plasma sintered ZrB2–ZrC–SiC composites

Ipek AKIN1) and Gultekin GOLLER1)
1) Istanbul Technical University, Department of Metallurgical and Materials Engineering

  ZrB2–ZrC–SiC composites were prepared by spark plasma sintering (SPS) at temperatures of 1750°C for 300 s under a pressure of 40 MPa. Densification, microstructural, mechanical properties and oxidation behavior of the composites were investigated. Fully dense ZrB2–ZrC–SiC composites with a relative density of more than 99% were obtained at 1750°C for 300 s. Vickers hardness of ZrB2–ZrC–SiC composites decreased with increasing ZrC content from 20 to 40 vol %, and composite containing 60 vol % ZrB2, 20 vol % ZrC and SiC sintered at 1750°C for 300 s had the highest value of 21.1 GPa. The crack mode for the same composite was zigzag, and resulted in remarkable crack deflections and the highest fracture toughness value of 5.5 MPa·m1/2. Oxidation of composites resulted in formation of protective layered oxide structures consisted of ZrO2 and Si–O rich layer in the form of SiO2 or SiO, and normalized mass change results increased with increasing oxidation temperature.

Sintering, Carbides, Mechanical properties, Densification

Received: December 01, 2011
Accepted: February 20, 2012 , Published online: March 28, 2012
Copyright (c) 2012 The Ceramic Society of Japan



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