The attempts to develop a bioactive material with physical and chemical properties similar to a natural bone remains still an unsolved problem. Current research work concentrates mainly on composite materials. The first possibility is to improve the mechanical properties of bioactive material like e. g. hydroxyapatite, especially its strength and fracture toughness. Unnecessary the results of the investigations deal with reinforcements in the form of plates, dispersions, whiskers or fibres are not quite satisfactory. It is much better to introduce bioactive phase in volume or onto the surface of material with appropriate mechanical properties in which it will play a role of active centres favouring the formation of natural HAP, i.e. the bone tissue. Such materials with good mechanical and chemical properties, successfully applied in medicine are polysulphone and carbon-carbon composites. Addition of hydroxyapatite to these materials has beneficial effects on their biological behavior and assimilates them to natural bone. The present work analyzes the effects on the mechanical and biological properties of carbon and polymeric composites modified by hydroxyapatite, both natural (of nano-particles) and synthetic (of mikro-particles).
The results show that the carbon-HAP composites have the mechanical properties similar to carbon-carbon composites, while addition of HAP to polysulphone cause advantageous growth of Young modulus and limitation of creep and disadvantageous fall of tensile strength.
Tests performed in SBF for carbon-HAP and polysulphone-HAP composites prove that the process of hydroxyapatite’s build up becomes the most intensive in the case of a composite modified with use of nano-particles originating from natural hydroxyapatite and containing the carbonaceous phase.

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