Effect of SiC Particle Size on the Microstructural, Mechanical and Oxidation Properties of In-situ Synthesized HfB2-SiC Composites

Year 2021, Volume: 24 Issue: 2, 503 - 510, 01.06.2021

Kübra Gürcan , Bora Derin , Erhan Ayas

https://doi.org/10.2339/politeknik.682256

Cited By: 2

Abstract

In-situ synthesis and densification of hafnium diboride - silicon carbide (HfB2-SiC) ceramic composites were studied by the spark plasma sintering (SPS) method using HfO2, B, and SiC as starting powders. Influence of SiC particle size (∼2 µm and ∼10 µm) on mechanical properties and oxidation resistance of in-situ composites were extensively investigated. According to the achieved results, the highest densification (∼95 % TD) was obtained with fine SiC particle reinforcement. The measured Vickers hardness and fracture toughness of the composites containing fine SiC were 14.3 GPa and 5.42 MPa.m1/2, respectively. The fracture mode changed from transgranular cleavage to a mixed-mode, and the crack deflection was believed to be the primary toughening mechanism. From oxidation test result, the composite with fine SiC particles exhibited more inhomogeneous oxide scales compared to that of coarse SiC containing composite. 

Keywords

Ultra high temperature ceramics, HfB2-SiC, in-situ synthesis, SPS

Supporting Institution

Anadolu Üniversitesi-Eskişehir Teknik Üniversitesi

Project Number

1505F506

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