The fracture toughness coefficient Kc of the composite ceramics for medical applications based on hydroxy-apatite (HA) with additives of multi-walled carbon nanotubes (MWCNTs) were investigated. Sintering of the composites was carried out at a temperature of 1100°C in an argon atmosphere. The rate of the heating up to temperature of sintering was 20 K/min. HA is a bioactive matrix, and the additives of MWCNTs were used with the purpose of increasing the fracture toughness coefficient Kc. Nanoindentation tests were carried out using microhardness tester Affri DM8 with Vickers pyramid-shaped diamond indenter under a load of 4.9 N. It was found that the additives of MWCNTs with the concentration up to 0.5 wt % lead to a small increase of the Kc of the composite.

Topics
Hardness, Sintering, Nano-indentation, Ceramics, Nanotubes, Minerals
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