ROŞU Radu Alexandru Politehnica University of Timisoara

Spoluautoři POPESCU Mihaela, ŞERBAN Viorel-Aurel, PERIANU Ion Aurel

Medical implants used in medicine are made of different alloys such as stainless steels, cobalt and chromium alloys, titanium and its alloys. Among these alloys, titanium has the most interest because of its properties: high strength, low density, very good corrosion resistance. To increase the biocompatibility, titanium alloys are coated with ceramic layers by diverse methods. Alumina (Al2O3) is a biocompatible ceramic material that is commonly used in orthopedic to cover the metallic implants. In recent years It can be observed the growing interest in making alumina hip prostheses due to the lower operating life of polymer-metal joints often used. From all the thermal spraying methods, in the case of ceramics coating, plasma thermal spraying presents the best results because of the high temperatures developed by the plasma jet which are sufficient to melt the ceramic particles. The paper presents the experimental results on the deposition of alumina coatings on titanium alloy substrate by plasma thermal spraying method. X-ray diffraction performed on the powders used for coating and the obtained layers show that during thermal spraying process the structure suffered minor changes. Scanning electron microscopy analysis shows that the deposited layers are dense, uniform and without cracks. The roughness of the deposited layers has values between 5.12 and 5.38 µm which will ensure a good osseointegration of the implant in the human body.

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