Sintered nanocomposites ZrO2-WC obtained with field assisted hot pressing
In the paper, the research results o nanostructural composite ZrO2 – WC obtained with modified Field Assisted Sintering is described. Hot pressing processes were performed at different sintering temperatures using mixtures of different proportions of tungsten monocarbide, such as 10 wt%, 20 wt%., 30...
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Veröffentlicht in: | Composite structures 2021-03, Vol.259, p.113443, Article 113443 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In the paper, the research results o nanostructural composite ZrO2 – WC obtained with modified Field Assisted Sintering is described. Hot pressing processes were performed at different sintering temperatures using mixtures of different proportions of tungsten monocarbide, such as 10 wt%, 20 wt%., 30 wt%. Sintering process activated by alternating current provided good results in short time of 2 min at pressure 30 MPa and temperature 1350 °C. Reduced temperature and shorter sintering time prevented grains from growth, ensuring enhanced mechanical properties of the composite. The test campaign included analysis of shrinkage process and respective porosity of obtained composite, analysis of bulk material structure, especially dimensions and composition of grains, as well as analysis of mechanical properties, such as microhardness and fracture toughness. Analysis of wear resistance was performed in real work conditions, comparing the nozzles made from different materials working in an abrasive waterjet machining system. Even though the mechanical properties of the sintered ZrO2 – WC material was comparable to the other reported methods and compositions, the proposed modified Field Assisted method consumed much less energy and time. The most remarkable result was obtained for wear resistance, where the tested nozzle worked almost two times longer than the ones available in the market. |
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ISSN: | 0263-8223 1879-1085 |
DOI: | 10.1016/j.compstruct.2020.113443 |