Improvement of the mechanical properties of spark plasma sintered hap bioceramics by decreasing the grain size and by adding multi-walled carbon nanotubes
| Autor: | Petar S. Uskoković, Dj. Janaćković, E. Palcevskis, Ints Šteins, G. Vukovic, Rada Petrović, Djordje Veljovic |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Spark plasma sintering Sintering 02 engineering and technology Bioceramic Carbon nanotube mechanical properties lcsh:Chemical technology 010402 general chemistry 01 natural sciences law.invention Fracture toughness law Materials Chemistry lcsh:TP1-1185 Composite material grain size Nanocomposite carbon nanotubes nanocomposite Metals and Alloys hydroxyapatite 021001 nanoscience & nanotechnology Condensed Matter Physics Grain size 0104 chemical sciences Ceramics and Composites Nanometre 0210 nano-technology |
| Zdroj: | Science of Sintering, Vol 45, Iss 2, Pp 233-243 (2013) |
| ISSN: | 1820-7413 0350-820X |
| Popis: | Composites based on HAP and oxidized multi-walled carbon nanotubes (o-MWCNT) and monophase HAP materials were processed by spark plasma sintering. Starting from stoichiometric nano-sized HAP powder, monophase bioceramics were obtained with a density close to the theoretical one and with an average grain size of several hundred nanometers to micron dimensions. It was shown that decreasing the sintering temperature resulted in a decrease of the grain size, which affected an increase in the fracture toughness and hardness. The fracture toughness of an HAP/ o-MWCNT bioceramic processed at 900°C for only 5 min was 30 % higher than that of monophase HAP materials obtained under the same conditions. The addition of MWCNT during SPS processing of HAP materials caused a decrease in the grain size to the nano-dimension, which was one of the reasons for the improved mechanical properties. [Projekat Ministarstva nauke Republike Srbije, br. III45019 i FP7-REGPOT-2009-1 NANOTECH FTM, Grant Agreement Number: 245916] |
| Databáze: | OpenAIRE |
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