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http://hdl.handle.net/10662/22409
Títulos: | Transient liquid-phase assisted spark-plasma sintering and dry sliding wear of B4C ceramics fabricated from B4C nanopowders |
Autores/as: | Ojalvo Guiberteau, Cristina Zamora Rodríguez, Víctor Moreno, Rodrigo Guiberteau Cabanillas, Fernando |
Palabras clave: | B4C;Sliding wear;Aqueous colloidal processing;Spark-plasma sintering;Transient liquid-phase sintering;Desgaste por deslizamiento;Procesamiento coloidal acuoso;Sinterización por plasma con chispa;Sinterización transitoria en fase líquida |
Fecha de publicación: | 2021 |
Editor/a: | Elsevier |
Resumen: | With the motivation of developing B4C composites with superior wear resistance for tribological applications, an ultrafine-grained (∼200−300 nm) B4C composite was fabricated, characterized microstructurally, and tested mechanically and tribologically. First, a well-dispersed powder mixture of B4C nanopowders (∼40 nm) with coarse Ti-Al powders (∼38 μm) as transient liquid-phase sintering additives was environmentally-friendly prepared by aqueous colloidal processing, optimized by measurements of the zeta potential of dilute suspensions and rheological studies of concentrated suspensions. Second, the powder mixture obtained by freeze-drying was densified by spark-plasma sintering (SPS), identifying the optimal SPS temperature (1850°C) by measurements of density, hardness, and toughness. Third, the dry sliding-wear behaviour of the optimal superhard B4C composite (∼31.5 GPa) was investigated by pin-on-disk tests and observations of the worn surface, determining its specific wear rate (∼4.4·10−8 mm³/(N·m)) as well as wear mode (two-body abrasion) and mechanism (plastic deformation). And lastly, the wear behaviour of the ultrafine-grained B4C composite was compared with that of a reference fine-grained (∼0.7−0.9 μm) B4C composite, finding that both have the same mode and mechanism of wear but with the former being more resistant than the latter (∼2.3·107 vs 1.9·107 (N·m)/mm³). Implications for the fabrication of B4C tribocomponents with greater superior wear resistance are discussed. |
Descripción: | Publicado en: Journal of the European Ceramic Society, Volume 41, Issue 3, March 2021, Pages 1869-1877 con DOI https://doi.org/10.1016/j.jeurceramsoc.2020.10.058 |
URI: | http://hdl.handle.net/10662/22409 |
ISSN: | 0955-2219 |
DOI: | 10.1016/j.jeurceramsoc.2020.10.058 |
Colección: | DIMEM - Artículos |
Archivos
Archivo | Descripción | Tamaño | Formato | |
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j_jeurceramsoc_2020_10_058_AAM.pdf | 4,17 MB | Adobe PDF | Descargar |
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