Toughening of Alumina Ceramics with Silver Nanoparticles
| Autor: | Enrique Rocha Rangel, José Amparo Rodríguez García, Parque Científico, Constantin Alberto Hernández-Bocanegra, Azucena Pérez de la Fuente |
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| Rok vydání: | 2016 |
| Předmět: |
Pressing
Materials science Scanning electron microscope 020502 materials 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure Silver nanoparticle law.invention Metal Fracture toughness 0205 materials engineering Optical microscope law visual_art Indentation visual_art.visual_art_medium Composite material 0210 nano-technology |
| Zdroj: | Journal of Research in Nanotechnology. :1-7 |
| ISSN: | 2379-9706 |
| DOI: | 10.5171/2016.957063 |
| Popis: | In this study ceramic materials with an Al 2O3-matrix toughened with different amounts of Ag nanoparticles (0.0, 0.5, 1.0, 2.0 and 3.0 wt. %) were fabricated. High energy milling was used to mix the materials in a planetary mill t ype, in which powder particles with sizes of ~300nm were obtained. With the milled powders, they were fabricated cylindrical samples by uniaxial pressing. Then, compacted samples were sintered in an electrical furnace at different temperatures (1400°C, 1500°C a nd 1600°C) and during different times (1, 2 and 3h). Microstructure observations were mad e with optical microscopy and scanning electron microscopy, observing in both cas es dense composites with very fine microstructures. Concerning the measurement results of fracture toughness, which were estimated by the indentation fracture method, it wa s shown that the composites made by mean procedure present higher values than the avera ge of the monolithic alumina, up to 400%. It was determined that the reinforcement mechanism of these materials is due to the deflection of cracks owing to metallic bridges form ed by the silver used as alumina strengthener. |
| Databáze: | OpenAIRE |
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