Carlos Maurício Lepienski
Federal University of Paraná
Analytical chemistryNitridingIonComposite materialTribologyThin filmMetallurgyMaterials scienceGlow dischargePlasma-immersion ion implantationLayer (electronics)IndentationIon implantationHardnessElastic modulusNanoindentationTitaniumNitrogenPlasmaMicrostructure
169Publications
26H-index
2,202Citations
Publications 164
Newest
#1Gregory Beilner (UFPR: Federal University of Paraná)H-Index: 1
#2Bruno Leandro Pereira (UFPR: Federal University of Paraná)H-Index: 5
Last. Michael J.D. NugentH-Index: 13
view all 11 authors...
Among titanium alloys with non-toxic elements, the Ti-25Nb-25Ta alloy has good elastic behavior for applications in osseous implants, biocompatibility, and excellent corrosion resistance. The present study aimed to better the biocompatibility characteristics of Ti-25Nb-25Ta alloy modifying its surface through Plasma Electrolytic Oxidation (PEO) treatment. The formed oxide coating is amorphous and composed of two distinct porous formations: smaller hole-shaped pores and larger volcano-like pores....
1 CitationsSource
Abstract The UNS S32750 super duplex stainless steel (SDSS) was low temperature plasma nitrided at 350 °C and 400 °C for 4 h. Pitting and crevice corrosion resistance was evaluated using electrochemical techniques in a NaCl neutral solution. Nitriding treatments resulted in increased in hardness, general corrosion resistance and in the passive layer breakdown potential. Regarding crevice corrosion tests, the nitrided surfaces showed lower current densities during the potentiostatic polarization ...
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#1Bruno Leandro Pereira (UFPR: Federal University of Paraná)H-Index: 5
#2Gregory Beilner (UFPR: Federal University of Paraná)H-Index: 1
Last. Michael J.D. Nugent (Athlone Institute of Technology)H-Index: 13
view all 10 authors...
Abstract Well-adhered nanotube arrays were produced through the anodizing technique on a Ti-25Nb-25Ta alloy and tribo-mechanically evaluated by nanoindentation and nanoscratch tests. Disregarding substrate effects, the hardness of the nanotube arrays layer was 0.7 ± 0.1 GPa and elastic modulus was
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#1Mario UedaH-Index: 21
#2Jose O. RossiH-Index: 15
Last. H. ReutherH-Index: 12
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Plasma immersion ion implantation (PIII) was conducted in a large volume chamber with a current-controlled high-voltage pulser, to test the vacuum, plasma, and PIII conditions, in a preparation for the treatments of large workpieces or the batch-processing mode. For that purpose, a rugged high-power pulser (10 kW average) based on solid-state moderate voltage pulse system (1 kV) was coupled to a high-voltage transformer (1:22) to feed different loaded sample supports placed in different position...
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#1Bruno Leandro Pereira (UFPR: Federal University of Paraná)H-Index: 5
#2Gregory Beilner (UFPR: Federal University of Paraná)H-Index: 1
Last. Michael J.D. Nugent (Athlone Institute of Technology)H-Index: 13
view all 10 authors...
Abstract Hydroxyapatite (HA) is a bioactive calcium phosphate capable of enhancing the implant/bone connection improving osteoconductivity and osseointegration process. However, the HA presents mechanical properties limiting its application. A good way to resolve this limitation is to combine the excellent biological properties of HA with materials with suitable mechanical behavior, like Ti-25Nb-25Ta alloy. The Ti-25Nb-25Ta alloy is composted by non-toxic and corrosion-resistant elements, presen...
5 CitationsSource
#1Bruno Leandro Pereira (Athlone Institute of Technology)H-Index: 5
#2Carlos Maurício Lepienski (UFPR: Federal University of Paraná)H-Index: 26
Last. Michael J.D. Nugent (Athlone Institute of Technology)H-Index: 13
view all 11 authors...
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#1Anna Paulla Simon (UTFPR: Federal University of Technology - Paraná)H-Index: 3
#2Vidiany Aparecida Queiroz Santos (UFSCar: Federal University of São Carlos)H-Index: 1
Last. Mariana de Souza Sikora (UTFPR: Federal University of Technology - Paraná)H-Index: 3
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2 CitationsSource
#1Aline R. Luz (UFPR: Federal University of Paraná)H-Index: 4
#2Gabriel Goetten de Lima (UFPR: Federal University of Paraná)H-Index: 9
Last. Neide K. Kuromoto (UFPR: Federal University of Paraná)H-Index: 13
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Abstract A number of researches have been concerned about the development of β-type titanium alloys because they can present good biocompatibility, non-cytotoxicity, suitable mechanical and corrosion resistance behavior. However, due to their chemical inertness property, the surfaces of the novel Ti alloys must be modified by different methods to improve their bioactivity. This work is focused on the electrochemical surface modification of Ti-10Nb and Ti-20Nb alloys by Plasma Electrolytic Oxidat...
4 CitationsSource
#1Gabriel Goetten de Lima (Athlone Institute of Technology)H-Index: 9
#2Aline R. Luz (UFPR: Federal University of Paraná)H-Index: 4
Last. Michael J.D. Nugent (Athlone Institute of Technology)H-Index: 13
view all 8 authors...
Abstract The following chapter gives an overview of the anodic layers and nanotubes produced with plasma electrolytic oxidation. An introduction into the mechanisms involved in producing these nanofilms, such as the required processing parameters including voltage, current, and time, are discussed. In addition to an examination into the relation and the requirements for a good interface between the implant using these nanofilms and the bone, we also investigate and discuss the available commerci...
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