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Amorphous materials in the production of new implants

Kiljan A., Liptakova T.

Production Engineering Archives

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2018

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Vol. 18

50--53

EN

Amorphous materials based on magnesium are new materials for potential biomedical application, especially for new implants, as they bear resemblance to titanium implants. Mg66Zn30Ca4 alloy has specific properties, especially mechanical and corrosive, therefore, it has biomedical application as its properties are better than that of other materials. The following paper describes amorphous alloy based on magnesium, properties and shows how to produce amorphous samples of Mg66Zn30Ca4.

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The influence of welded joint quality on safety and reliability in operation

Bokuvka O., Liptakova T., Palcek P., Chalupova M., Trsko L.

Production Engineering Archives

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2013

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Vol. 1, No. 1

6--9

EN

The quality of welded joint is an assumption of long-term reliability in operation. On the contrary, defective work of bad quality welded joint leads to fracture and crashes of plants. In this paper the authors state that experimentally obtained causes of rails and pipes fractures were the result of bad realization of welded joint. Pores, blowholes, slags, lack of fusion, non-plastic non-metallic particles, cracks, shrink holes were the defects observed in the welded joint area. These defects substantially decreased the load-bearing cross section and the final result was fracture. The railway and high-pressure gas lines out of operation are undesirable and accompanied by considerable financial losses.

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Surface state effect on pitting corrosion of AlSi316Ti

Fajnor P., Liptakova T.

International Journal of Applied Mechanics and Engineering

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2010

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Vol. 15, no 2

377-382

EN

The subject of the work is to study the surface treatment effect on the resistance of the AISI 316Ti stainless steel to pitting corrosion. The tested ground surfaces are without chemical treatment, pickled and passivated. The corrosion tests are carried out by exposition in solution which evoke pitting and by by electrochemical cyclic potential - sweep method. According to the results, the surface treatment, has a great influence on the resistance of the tested material to pitting. It is not possible to estimate the best surface treatment because behavior of the AISI 316Ti stainless steel with a different surface state depends on the mechanism of corrosion processes which vary in the experimental methods employed.

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Time and mixing technique-dependent changes in bone cement SmartSet HV

Lelovics H., Liptakova T.

Acta of Bioengineering and Biomechanics

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2010

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Vol. 12, no. 4

63-67

EN

For the past fifty years bone cements based on polymethylmethacrylate (PMMA) have been used in orthopaedic surgery for fixation of endoprostheses, especially in the cases of total hip replacement. It was shown that during this period vacuum mixing minimalizes the number of unwanted pores and thereby influences the mechanical properties of the cement. It was also discovered that later polymerization of the cement after its implantation lasts up to 6 months and changes its mechanical properties. In this study, mechanical properties (microhardness and elastic modulus measured by microindentation) of hand- and vacuum-mixed acrylic bone cement SmartSet HVŽ were investigated and compared after different time of cement exposition. This study points out that the measures of changes occurring with time in mechanical properties of differently mixed cement samples are equal but microhardness and elastic modulus are different and depend upon the technology of mixing.