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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

science of sintering/science of sintering

Improvement of the mechanical properties of spark plasma sintered hap bioceramics by decreasing the grain size and by adding multi-walled carbon nanotubes