Processing of ZrB2 tribo-ceramics by reactive spark plasma sintering of ZrH2+2B subjected to high-energy pre-ball-milling
The reactive spark plasma sintering (RSPS) of monolithic ZrB2 ceramics from ZrH2+2B powder mixtures subjected to shaker pre-milling was investigated, and compared with other three sintering approaches. It was found that RSPS is optimal at 1850 °C, which results in fully-dense ZrB2 ceramics with ∼20...
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/162198 |
| Acceso en línea: | https://hdl.handle.net/11441/162198 https://doi.org/10.1016/j.jeurceramsoc.2023.04.047 |
| Access Level: | acceso abierto |
| Palabra clave: | ZrB2 Reactive spark plasma sintering High-energy ball-milling Tribo-ceramics Sliding wear |
| Sumario: | The reactive spark plasma sintering (RSPS) of monolithic ZrB2 ceramics from ZrH2+2B powder mixtures subjected to shaker pre-milling was investigated, and compared with other three sintering approaches. It was found that RSPS is optimal at 1850 °C, which results in fully-dense ZrB2 ceramics with ∼20 GPa hardness. Comparatively, at 1850 °C RSPS from the simply-mixed ZrH2+2B powder mixture, SPS from the commercial ZrB2 powder, and SPS from the shaker-milled ZrB2 powder result in non-dense (76.7–86.7%) and softer (6.0–11.8 GPa) ZrB2 ceramics. Furthermore, the optimally RSPS-ed ZrB2 ceramic was subjected to unlubricated sliding-wear tests against diamond under 40 N load for 1000 m of sliding, demonstrating that it is a promising tribo-ceramic that only undergoes mild tribo-oxidative wear at 10–8 mm3/(N·m) in the form of a slight plasticity-dominated two-body abrasion with eventual formation and partial loss of a self-lubricating and protective oxide tribolayer. |
|---|