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EN
In this article, methodical aspects of studies on material fretting wear have been presented. The results of studies conducted on a “pin on disc” type device made at the Department of Materials and Biomedical Engineering of the Bialystok University of Technology confirmed the decisive influence of the amplitude of oscillations and the load value on the course and nature of the process. At a constant value of load, the course of resistance to motion was dependent on the amplitude. Increasing the amplitude of oscillations caused a change in friction conditions: from static friction (elastic deformation of formed adhesive connections, without dislocation of cooperating elements) to kinetic friction (breaking of adhesive bridges and displacement with sliding). The increase of the load value at a constant amplitude value caused a change in the course and nature of resistance to motion from sliding friction to friction at-rest.
PL
W pracy przedstawiono analizę odporności korozyjnej nowych stopów tytanu otrzymanych metodą metalurgii proszków. Przedmiotem analizy były krzywe potencjodynamiczne wykonane na podstawie danych uzyskanych z urządzenia ATLAS 9933 ELEKTROCHEMICAL INTERFACE. Korzystając z programu POL-99 wyznaczono wartości potencjałów korozyjnych oraz prądów korozji spieków tytanowych. Porównano charakterystyki korozyjne nowych stopów tytanowych i li- tego stopu handlowego – Ti6Al4V. Stwierdzono przesunięcie potencjału korozyjnego badanych spieków w stronę wyższych potencjałów względem stopu handlowego.
EN
This article presents analysis of corrosion resistance of the titanium alloys obtained by powder metallurgy method. The potenciodynamic curves made from data obtained from the ATLAS 9933 ELEKTROCHEMICAL INTERFACE device were analyzed. Corrosion potentials and corrosion currents of sintered titanium were evaluated by the POL-99. The characteristics of corrosion of new titanium alloys and solid commercial alloy-Ti6Al4V were compared. It was found that corrosion potentials of sintered materials are displaced into higher potential than commercial alloy.
EN
The paper presents results of microscopic observations of selected porcelain bridges prepared on metallic base. The aim of microscopic observations was the identification of example wear types which have appeared during dental prosthetic bridges exploitation. The main attention was directed to wear forms that are quite often present in case of such prosthetic elements. The wear types comparative analysis was evaluated. The most frequent types of wear are: material's cracking, abrasive wear. Also, the metal corrosion and wear by dental plaque at prosthetic bridge surface were observed.
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