Effect of nano-yttria addition on the properties of WC/Co composites

The processing and sintering of composites composed of WC/Co and 5-20 wt% yttria nanoparticles were investigated. The composite mixtures were mixed, formed and sintered at 1450 C under vacuum. The properties of these composites in terms of densification parameters, fracture toughness, and hardness w...

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Bibliographic Details
Published in:Materials in engineering 2013-12, Vol.52, p.481-486
Main Author: El-Kady, O A M
Format: Article
Language:English
Subjects:
Comminution
Densification
Fracture toughness
Hardness
Microstructure
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Sintering
Yttrium oxide
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Summary:The processing and sintering of composites composed of WC/Co and 5-20 wt% yttria nanoparticles were investigated. The composite mixtures were mixed, formed and sintered at 1450 C under vacuum. The properties of these composites in terms of densification parameters, fracture toughness, and hardness were measured. The results showed an improvement in the properties of WC/Co with the addition of 5 wt%Y2O3. However, the addition of less or more than 5 wt% yttria nanoparticles had a negative effect on the properties. The fracture toughness of WC/Co-5 wt%Y2O3 showed a remarkable enhancement (about 13.611 MPa.m1/2) compared to the reported data of WC-6.5%Co composite (about 9-11 MPa.m1/2). The microstructure was correlated with the changes in these properties.
ISSN:0261-3069
DOI:10.1016/j.matdes.2013.05.034