Titanium Diboride-Silicon Carbide-Boron Carbide Ceramics with Super-High Hardness and Strength
Triplex particulate composites composed of boride and carbide ceramics were found to have high strength, hardness, and fracture toughness values. Two compositions consisting of 70:15:15 and 1:1:1 volume ratios of TiB2, SiC, and B4C were produced from commercially available powders by hot-pressing. The 70:15:15 ceramic exhibited a strength of ~1.3 GPa, while the 1:1:1 ceramic had a strength of ~0.9 GPa. These strengths are comparable to super-strong Y2O3-PSZ and β-SiAlON based composites. The Vickers' hardness values of these ceramics were ~32 GPa for indent loads of 9.8 N. Hardness increased as indentation load decreased. The 1:1:1 ceramic had a hardness of ~53 GPa at an indentation load of 0.49 N, higher than values reported for so-called "super-hard" ceramics, and comparable to c-BN.
E. W. Neuman et al., "Titanium Diboride-Silicon Carbide-Boron Carbide Ceramics with Super-High Hardness and Strength," Journal of the American Ceramic Society, vol. 101, no. 2, pp. 497-501, Blackwell Publishing Inc., Feb 2018.
The definitive version is available at https://doi.org/10.1111/jace.15201
Materials Science and Engineering
Keywords and Phrases
Boron Carbide; Silicon Carbide; Super-Hard; Super-Strong; Titanium Diboride
International Standard Serial Number (ISSN)
Article - Journal
© 2017 American Ceramic Society, All rights reserved.
01 Feb 2018