Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

The process of glow discharge assisted oxynitriding of titanium alloy in aspect of its application in artificial heart components

nr katalogowy: 52786

Medical industry is constantly searching for new biomaterials, that may meet the requirements connected with their application. The best biocompatible metallic materials are titanium and its alloys which besides their good biocompatibility have low density and high mechanical properties [1÷4]. They are widely used for among others osseous implants, osseous fixation elements, pins, plates and screws, elements of dental implants and medical instruments [5]. In order to improve resistance to frictional wear, corrosion resistance and fatigue strength, as well as to eliminate occurrence of metalosis and improve biocompatibility of titanium materials various methods of surface engineering are successfully applied [1, 6÷8]. Application of surface engineering methods to give antithrombogenic properties to titanium alloys used in artificial heart or other components contacting with blood is a new challenge. The latest research shows that titanium oxide is a prospective hemocompatible material. Most of currently conducted research works dealing with hemocompatibility of titanium oxide regards layers made on polyurethane, polyethylene or pyrolytic carbon (LTI-carbon) substrate. Examination of hemocompatibility of oxide layers produced on siliceous substrate with a method of plasma immersion ion implantation and deposition (PIII-D) revealed better biocompatibility of these materials in contact with endothelium cells as well as antiadhesive properties of layers of crystal structures in comparison with layers of amorphous structure [9, 10]. Various methods of oxide layers modification are being searched for. For example doping with lanthanum oxide impurities La2O3 of TiO2 layer made with an application of RF-magnetron sputtering method on silica substrate considerably increases hemocompatibility of produced layers and reduces coagulation of blood platelets [11]. Successful attempts of improving biological properties of pyrolitic low tempera[...]

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2010-3

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