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Zirconium diboride based ceramics, owing to their superior high temperature properties are potential materials for use as leading edge components in hypersonic space vehicles. However, the difficulty in sintering these ultra high temperature ceramics limit their applications to some extent. Sintering of such materials is usually accomplished by resorting to advanced sintering techniques such as Spark Plasma Sintering (SPS) accompanied by sinter aids to improve the sinterability. In this backdrop, the current work investigates the effect of Ti addition on the mechanical properties and sinterability of ZrB2-based ceramic composites. Tailored addition of Ti to ZrB2-18 wt. % SiC baseline composites not only improves the densification but also increases hardness and indentation toughness, when sintered using Multi Stage Spark Plasma Sintering technique. Microstructure and X-ray diffraction analysis reveals the presence of ultrafine grains of ZrB2 and SiC, which is found to be effective in obtaining a good hardness (up to 29 GPa) and reliable indentation toughness (up to 9 MPa center dot m(1/2)). (C) 2016 The Ceramic Society of Japan. All rights reserved

Development of ZrB<sub>2</sub>&ndash;SiC&ndash;Ti by multi stage spark plasma sintering at 1600&deg;C

Development of ZrB<sub>2</sub>–SiC–Ti by multi stage spark plasma sintering at 1600°C