Partner: Ł. Żrodowski |
Recent publications
1. | Borowski T.♦, Zielińska K., Spychalski M.♦, Adamczyk-Cieślak B.♦, Żrodowski Ł.♦, Effect of oxidation temperature on the properties of niobium in view of its biomedical applications, SURFACE AND COATINGS TECHNOLOGY, ISSN: 0257-8972, DOI: 10.1016/j.surfcoat.2023.129911, Vol.473, No.129911, pp.1-11, 2023 Abstract: Four-hour oxidation processes of niobium in an air atmosphere at temperatures of 400 °C, 425 °C, 450 °C and 500 °C were carried out. In order to characterise the layers produced, the cross-sectional microstructure, chemical and phase composition as well as surface roughness were examined. The mechanical properties of the surface were determined by performing Vickers microhardness tests. In order to verify the properties from a biological point of view, contact angle analysis and corrosion tests in Ringer's solution were carried out. The results revealed the formation of layers composed of a solid solution of oxygen in niobium Nb(O) at oxidation temperatures of 400 °C, a solution of Nb(O) and niobium pentoxide Nb2O5 at 425 °C, and Nb2O5 at 450 °C and 500 °C. Increased oxidation temperature resulted in an increase in hardness and surface roughness, and each process contributed to improved corrosion resistance. Oxidation at too high temperature (≥450 °C) caused degradation of the material's surface due to niobium's low heat resistance. At 450 °C the first cracks in the material were visible, and at 500 °C the layer was inhomogeneous, brittle and underwent significant chipping. The highest hardness, roughness and hydrophobic properties were shown by niobium oxidised at 500 °C, which underwent surface degradation at this temperature. In turn, niobium oxidised at 400 °C and 425 °C showed outstanding properties in the biological aspect, achieving both high hydrophilicity and the highest corrosion resistance. Keywords:Niobium, Oxidation, Microstructure, Corrosion, Contact angle, Surface engineering Affiliations:
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Patents
Filing No./Date Filing Publication | Autor(s) Title Protection Area, Applicant Name | Patent Number Date of Grant | |
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424869 2018-03-13 BUP 20/2019 2019-09-23 | Łacisz W.♦, Ostrysz M.♦, Czarnecka K., Kaczyński K.♦, Rałowicz R.♦, Żrodowski Ł.♦Urządzenie do atomizacji ultradźwiękowej materiałów metalicznych i sposób jego czyszczeniaPL, 3D LAB sp. z o.o. | - - - | |
424870 2018-03-13 BUP 20/2019 2019-09-23 | Żrodowski Ł.♦, Żrodowski C.♦, Wróblewski R.♦, Czarnecka K., Wysocki B.♦, Rałowicz R.♦Sonotroda z wewnętrznym systemem chłodzeniaPL, 3D LAB sp. z o.o. | - - - | |
423442 2017-11-13 BUP 11/2019 2019-05-20 | Wysocki B.♦, Żrodowski Ł.♦, Chmielewska A.♦, Święszkowski W.♦, Supeł A.♦, Kurzydłowski K.♦, Czarnecka K.Sposób wytwarzania addytywnego trójwymiarowych obiektówPL, Żrodowski Łukasz | 233190 WUP 09/2019 2019-09-30 | |
423410 2017-11-09 BUP 11/2019 2019-05-20 | Żrodowski Ł.♦, Rałowicz R.♦, Rozpendowski J.♦, Czarnecka K.Urządzenie do wytwarzania sferycznych proszków metali metodą atomizacji ultradźwiękowejPL, 3D LAB sp. z o.o. | - - - |