Densification, Microstructure, and Mechanical Properties of ZrC-SiC Ceramics
ZrC-SiC ceramics were fabricated by high-energy ball milling and reactive hot pressing of ZrH2, carbon black, and varying amounts of SiC. The ceramics were composed of nominally pure ZrC containing 0 to 30 vol% SiC particles. The relative density increased as SiC content increased, from 96.8% for nominally pure ZrC to 99.3% for ZrC-30 vol% SiC. As SiC content increased from 0 to 30 vol%, Young's modulus increased from 404 ± 11 to 420 ± 9 GPa and Vickers hardness increased from 18.5 ± 0.7 to 23.0 ± 0.5 GPa due to a combination of the higher relative density of ceramics with higher SiC content and the higher Young's modulus and hardness of SiC compared to ZrC. Flexure strength was 308 ± 11 MPa for pure ZrC, but increased to 576 ± 49 MPa for a SiC content of 30 vol%. Fracture toughness was 2.3 ± 0.2 MPa·m1/2 for pure ZrC and increased to about 3.0 ± 0.1 MPa·m1/2 for compositions containing SiC additions. The combination of high-energy ball milling and reactive hot pressing was able to produce ZrC-SiC ceramics with sub-micron grain sizes and high relative densities with higher strengths than previously reported for similar materials.
L. Feng et al., "Densification, Microstructure, and Mechanical Properties of ZrC-SiC Ceramics," Journal of the American Ceramic Society, vol. 102, no. 10, pp. 5786 - 5795, Blackwell Publishing Inc., Oct 2019.
The definitive version is available at https://doi.org/10.1111/jace.16505
Materials Science and Engineering
Keywords and Phrases
Densification; Mechanical properties; Microstructure; Reactive hot pressing; Zirconium carbide-silicon carbide ceramics
International Standard Serial Number (ISSN)
Article - Journal
© 2019 The American Ceramic Society, All rights reserved.
01 Oct 2019